Autodesk Maya 2011 Subdivision Surfaces User manual

Subdivision Surface Modeling
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Contents
Chapter 1
Subdivision surfaces overview . . . . . . . . . . . . . . . . . . . 1
What are subdivision surfaces? . . . . . . . . . . . . . . . . . . . . . . . 1
Subdivision surface modeling overview . . . . . . . . . . . . . . . . . . 2
Standard mode and polygon proxy mode . . . . . . . . . . . . . . . . . 3
Chapter 2
Subdivision surface conversion . . . . . . . . . . . . . . . . . . . 7
Prepare a polygonal surface for conversion to a subdivision
surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Prepare a NURBS surface for conversion to a subdivision surface . . . . . 9
Convert a NURBS or polygonal surface to a subdivision surface . . . . . 10
Convert a subdivision surface to polygons . . . . . . . . . . . . . . . . 11
Convert a subdivision surface to a NURBS surface . . . . . . . . . . . . 14
Chapter 3
Editing subdivision surfaces . . . . . . . . . . . . . . . . . . . . 15
Create a new subdivision level . . . . . . . . . . . . . . . . . .
Switch between subdivision levels . . . . . . . . . . . . . . . .
Apply or remove a crease in a subdivision surface . . . . . . . .
Use polygon tools to modify a subdivision surface . . . . . . . .
Modify a subdivision surface using Soft Modification . . . . . .
Display the edited vertices on a subdivision surface . . . . . . .
Convert a subdivision component selection . . . . . . . . . . .
Attach subdivision surfaces . . . . . . . . . . . . . . . . . . . .
Use transformation tools with subdivision surface components .
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iii
Improve interactive performance when editing subdivision
surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning up subdivision surfaces . . . . . . . . . . . . . . .
Reduce the number of levels in a subdivision surface .
Remove unused vertices from a subdivision surface . .
Chapter 4
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Mapping and editing UVs . . . . . . . . . . . . . . . . . . . . . 29
UV mapping for subdivision surfaces .
Edit UVs in Polygon Proxy Mode . . .
Map UVs onto a subdivision surface .
Edit subdivision surface UVs . . . . .
Chapter 5
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Sculpting surface meshes . . . . . . . . . . . . . . . . . . . . . 37
Using the Sculpt Geometry Tool for subdivision surfaces . . . . . . . . 37
Chapter 6
Subdivision surfaces tips . . . . . . . . . . . . . . . . . . . . . 39
Bind subdivision surfaces to skeletons . . . . . . . . . . . . . . . . . . 39
Apply a deformer to a subdivision surface . . . . . . . . . . . . . . . . 39
Render subdivision surfaces . . . . . . . . . . . . . . . . . . . . . . . . 41
Chapter 7
Subdivision surfaces menus . . . . . . . . . . . . . . . . . . . . 43
Subdiv Surfaces . . . . . . . . . . . . . . . . . . . . . . .
Subdiv Surfaces > Texture > Planar Mapping . . . . .
Subdiv Surfaces > Texture > Automatic Mapping . . .
Subdiv Surfaces > Texture > Layout UVs . . . . . . .
Subdiv Surfaces > Full Crease Edge/Vertex . . . . . .
Subdiv Surfaces > Partial Crease Edge/Vertex . . . . .
Subdiv Surfaces > Uncrease Edge/Vertex . . . . . . .
Subdiv Surfaces > Mirror . . . . . . . . . . . . . . .
Subdiv Surfaces > Attach . . . . . . . . . . . . . . .
Subdiv Surfaces > Match Topology . . . . . . . . . .
Subdiv Surfaces > Clean Topology . . . . . . . . . .
Subdiv Surfaces > Collapse Hierarchy . . . . . . . . .
Subdiv Surfaces > Standard Mode . . . . . . . . . . .
Subdiv Surfaces > Polygon Proxy Mode . . . . . . . .
Subdiv Surfaces > Sculpt Geometry Tool . . . . . . .
Subdiv Surfaces > Convert Selection to Faces . . . . .
Subdiv Surfaces > Convert Selection to Edges . . . .
Subdiv Surfaces > Convert Selection to Vertices . . .
Subdiv Surfaces > Convert Selection to UVs . . . . .
Subdiv Surfaces > Refine Selected Components . . .
Subdiv Surfaces > Select Coarser Components . . . .
Subdiv Surfaces > Expand Selected Components . . .
Subdiv Surfaces > Component Display Level > Finer .
iv | Contents
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Subdiv Surfaces > Component Display Level > Coarser
Subdiv Surfaces > Component Display Level > Base . .
Subdiv Surfaces > Component Display Filter > All . . .
Subdiv Surfaces > Component Display Filter > Edits . .
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Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Contents | v
vi
Subdivision surfaces
overview
1
What are subdivision surfaces?
Subdivision surfaces are a unique surface type available for modeling in Maya
that possess characteristics of both polygon and NURBS surface types.
Like NURBS surfaces, subdivision surfaces are capable of producing smooth
organic forms and can be shaped using relatively few control vertices.
Like polygon surfaces, subdivision surfaces allow you to extrude specific areas
and create detail in your surfaces when it is required. This is accomplished by
having the ability to work at different component levels of detail on the
subdivision surface. You can switch between the different levels of detail as
often as necessary.
A single subdivision surface can have different levels of detail in different regions.
That is, a region that has a complex shape can have more control points to
allow finer detail, while a simple or flat region will have fewer control points.
1
Modeling with subdivision surfaces is an easy way to create intricate objects
such as human hands. It combines the best features of NURBS and polygonal
modeling.
You can convert existing NURBS and polygon surface types to subdivision
surfaces and vice versa.
How subdivision surfaces work
Subdivision surfaces get their name from their characteristic “dividing into
regions of greater detail”. You start with a base mesh and divide and subdivide
regions into finer and finer detail, with each subdivision giving greater control
in that area.
You reshape subdivision surfaces by modifying control points at the different
levels of the hierarchy. The base mesh (or “level 0” mesh) allows you to reshape
large areas of the overall surface. The subdivided levels allow finer control in
specific regions of the surface.
Advantages of subdivision surfaces
■
Subdivision surfaces allow higher level control over shape than polygons.
■
They allow you to only use complex geometry in the complex regions of
your model.
■
They allow creases (sharp edges) and arbitrary topology (not just four-sided
sheets).
■
The continuity of subdivision surfaces eliminates many of the problems
that can occur at seams when you animate NURBS surfaces.
■
You can bind subdivision surfaces to skeletons at a coarse level and the
effects will translate smoothly to the finer levels.
Subdivision surface modeling overview
If you have never used subdivision surfaces before, the following workflow
description will help you get started:
1 Create a polygon mesh that roughly captures the basic shape of the model
you want to build. Ensure you initially construct it with a minimum
amount of polygons as much as possible.
This model will determine the base topology and control points of the
subdivision surface when you convert it to a subdivision surface.
2 | Chapter 1 Subdivision surfaces overview
Subdivision surfaces are very effective at creasing and refining edges so
you don't need to put a lot of effort into capturing those types of features
in the polygon mesh.
2 Select and object and press the 2 button to get an idea of how the rough
polygon model will convert to a subdivision surface as you work on it.
You can also convert to subdivision surface to check the conversion and
then undo back to the polygon model.
3 After you convert the polygon mesh to a subdivision surface, adjust the
shape of the subdivision surface by pushing and pulling vertices.
4 If you need more control in a particular region of the mesh, create a new
subdivision level while working in Standard mode.
5 If you want to apply a sharp edge to a region of the surface you can apply
either a full or partial crease.
6 Switch back to Polygon Proxy mode if you need to make topological
changes to the surface (for example, splitting a face). You can use the
polygon tools to edit the subdivision surface while working in Polygon
Proxy mode.
Related topics
■
Standard mode and polygon proxy mode on page 3
■
Use transformation tools with subdivision surface components on page
25
■
Create a new subdivision level on page 15
■
Switch between subdivision levels on page 16
■
Apply or remove a crease in a subdivision surface on page 18
■
Use polygon tools to modify a subdivision surface on page 20
■
Improve interactive performance when editing subdivision surfaces on
page 26
Standard mode and polygon proxy mode
Subdivision surfaces can be edited in two modes:
■
Standard mode
Standard mode and polygon proxy mode | 3
■
Polygon proxy mode
To work effectively with subdivision surfaces you must work using both modes.
You can easily switch between each mode using the marking menu.
Standard mode
Standard mode displays the subdivision surface in its native form. In standard
mode you can increase the number of components (refine regions) where you
need more detail in your model as well as view any existing levels of
refinement. You can manipulate refined components (move, rotate, or scale)
and keyframe the surface. You can also crease edges and vertices.
In Standard mode, when you refine a selected region of the surface the refined
components are segregated into different levels. When you first create a
subdivision surface it is displayed at the first level by default, called Level 0.
Level 0 is the coarsest level, also called the base mesh. Level 1 and higher
numbers are finer levels, where you can add finer details to the mesh.
The interactive performance when viewing complex subdivision surfaces is
always better when displaying a subdivision surface in standard mode than
in polygon proxy mode. For tips on further improving the interactive
performance, please refer to Improve interactive performance when editing
subdivision surfaces on page 26.
You can switch between standard mode and polygon proxy mode at any stage
of modeling. When you switch to standard mode, Maya deletes any extrude,
deformation, or other construction history you’ve created while in polygon
proxy mode.
Standard mode is also sometimes referred to as hierarchy mode because it lets
you switch between the hierarchical levels of refinement on the subdivision
surface.
Polygon proxy mode
Polygon Proxy mode creates a polygon mesh around the subdivision surface
that corresponds to the base mesh (level 0) of the subdivision surface. This
4 | Chapter 1 Subdivision surfaces overview
polygon mesh is only temporary and is used for editing the surface; Maya
deletes it when you switch back to Standard mode.
Polygon Proxy mode lets you use the polygon tools and features to modify
the base mesh (level 0) of the subdivision surface. For example, if you create
a model in Standard mode and then decide you need to extrude or delete a
face, you can switch to the Polygon Proxy mode, extrude or delete the face
on the polygon mesh (which in turn affects the base mesh), then return to
Standard mode. The Standard mode edits are maintained, unless they overlap
the affected face.
You can switch to Polygon Proxy mode at any stage of modeling. However,
if you’ve used deformers or created other construction history while in Standard
mode, you cannot switch to Polygon Proxy mode until you delete construction
history. Delete construction history on the object with Edit > Delete by Type
> History, and then switch to Polygon Proxy mode.
Notes
■
When skinning characters made from subdivision surfaces, be sure to set
your subdivision surfaces to Standard mode before skinning. Skinning
while in Polygon Proxy mode can lead to unexpected behavior.
Related topics
■
Create a new subdivision level on page 15
■
Switch between subdivision levels on page 16
■
Improve interactive performance when editing subdivision surfaces on
page 26
Standard mode and polygon proxy mode | 5
6
Subdivision surface
conversion
2
Prepare a polygonal surface for conversion to a
subdivision surface
A common way to start a subdivision surface is to create a simple “rough sketch”
of the shape with polygons and convert that to the base mesh of a subdivision
surface. Keep the following in mind when you create a polygon mesh.
When you are ready to convert a polygon mesh to a subdivision surface, see
Convert a NURBS or polygonal surface to a subdivision surface on page 10.
Start with as few faces as possible
A dense subdivision base mesh wastes control points and will reduce
performance.
If you want to convert an existing mesh, try using Mesh > Reduce to reduce the
number of faces in the mesh.
Use mostly 4-sided polygons (quads)
While subdivision surfaces can handle up to 256 sided polygons, you will get
best results from using mostly 4-sided polygons.
When modeling subdivision surfaces, try to avoid faces with more or less than
4 sides, and vertices with more or less than 4 adjacent faces.
When a face or patch on the original surface is not 4-sided, an extraordinary
vertex (a vertex with less than or more than 4 adjacent faces) is created at level
0 of the subdivision surface. This affects the parameterization of the subdivision
7
surface and might make the surface bumpy (the bigger the quads relative to
the model, the less this is a problem).
Put vertices and edges in the polygon mesh where you want them in the
subdivision surface
If you can plan out where you want vertices and edges in the model, it will
help you produce the results you want when modeling and binding the surface
to joints.
For example, edges must be present where you want to create a partial or full
crease, and as with polygonal and NURBS surfaces, edges should circle the
eyes and mouth on the model of a head.
Watch out for polygons that will not convert
You cannot create subdivision surfaces from the following types of polygonal
surfaces.
■
Nonuniform topology.
Use Mesh > Cleanup to correct nonmanifold geometry.
■
Lamina topology (faces are on top of each other sharing more than two
vertices or more than one edge).
Use Mesh > Cleanup to correct lamina geometry.
■
Free points or floating edges.
■
Interior vertices with two incident edges.
8 | Chapter 2 Subdivision surface conversion
■
Inconsistent normals.
One way to correct inconsistent normals is to use Normals > Conform.
Related topics
■
Prepare a NURBS surface for conversion to a subdivision surface on page
9
■
Convert a NURBS or polygonal surface to a subdivision surface on page
10
Prepare a NURBS surface for conversion to a
subdivision surface
When you are ready to convert a NURBS surface to a subdivision surface, see
Convert a NURBS or polygonal surface to a subdivision surface on page 10.
Some NURBS properties do not convert
If you create subdivision surfaces from the following types of NURBS surfaces,
you may get unexpected results.
■
Degrees other than 3 (cubic) are not converted.
■
Rational geometry (weighted CVs) is not converted.
■
Trimmed regions on a NURBS surface are not converted
■
NURBS spheres converted to subdivision surfaces will have incorrect surface
normals at the poles. When viewed in shaded mode the converted sphere
will have dark points indicating that the normals are being computed
incorrectly.
Consider converting to a polygon mesh first
A subdivision base mesh created from NURBS will probably be too dense, and
NURBS models are typically made of different surfaces that must be converted
individually and then attached.
By using Modify > Convert > NURBS to Polygons first, you can reduce and
attach the polygon mesh before converting to a subdivision surface.
Prepare a NURBS surface for conversion to a subdivision surface | 9
Use the following options with Modify > Convert > NURBS to Polygons >
to convert NURBS surfaces to a polygon mesh suitable for use as a subdivision
base mesh:
■
Set Type to Quads.
■
See Tesselation Method to General.
■
Set U Type and V Type to Per Surf # of Isoparms in 3D.
■
In the Number U and Number V boxes, try to find the lowest numbers
that roughly approximate the shape of the surface.
If you converted multiple NURBS surfaces, use Mesh > Combine to merge
them into a single polygon mesh. Then use Edit Mesh > Mergeor Edit Mesh
> Merge Edge Tool to merge internal border edges. To show border edges
clearly, choose Display > Polygons > Custom Polygon Display >
on Border Edges.
and turn
Related topics
■
Prepare a polygonal surface for conversion to a subdivision surface on page
7
■
Convert a NURBS or polygonal surface to a subdivision surface on page
10
Convert a NURBS or polygonal surface to a
subdivision surface
Modify > Convert > NURBS to Subdiv
Modify > Convert > Polygons to Subdiv
Alt + Shift + ~
Troubleshooting Convert
1 If the polygon mesh does not convert or results in a hard-to-use
subdivision surface, see the Prepare a polygonal surface for conversion
to a subdivision surface on page 7.
10 | Chapter 2 Subdivision surface conversion
2 If the NURBS surface does not convert to a subdivision surface or results
in a hard-to-use subdivision surface see the following:
■
Prepare a NURBS surface for conversion to a subdivision surface on
page 9
■
Convert a subdivision surface to polygons on page 11
■
Convert a subdivision surface to a NURBS surface on page 14
■
Modify > Convert > NURBS to Subdiv, Polygons to Subdiv
Convert a subdivision surface to polygons
Although you can use subdivision surfaces up to the completion of your
project, you may need to convert them to polygons after you have finished
modeling. For example, if you’re creating characters for a game, the game
engine often requires the models to be polygons.
Maya offers two ways to convert subdivision surfaces to polygons:
■
Tessellating creates a polygon surface that matches the contours of the
subdivision surface.
■
Extracting vertices creates a simpler, less dense polygon that matches the
control vertices, not the contours, of the subdivision surface.
To convert to a close approximation of your subdivision surface
1 Select the subdivision surface and choose Modify > Convert > Subdiv to
Polygons >
.
Convert a subdivision surface to polygons | 11
2 Make sure Vertices is not on.
3 Click Convert.
If the subdivision surface you tessellate has creases, the polygon edges that
result at the creases are not automatically made hard.
You can create a polygon mesh that can be converted to another subdivision
surface with the same shape as the original.
Convert to a rough approximation of the subdivision surface by matching
vertices
1 Select the subdivision surface and choose Modify > Convert > Subdiv to
Polygons >
.
2 Click Vertices and choose which level you want to use the vertices from.
3 Click Convert.
12 | Chapter 2 Subdivision surface conversion
Notes
■
The Subdiv to Polygons conversion only converts the UVs at Level 0 of
the subdivision surface to the converted polygon surface.
Related topics
■
Convert a NURBS or polygonal surface to a subdivision surface on page
10
■
Convert a subdivision surface to a NURBS surface on page 14
■
Modify > Convert > Subdiv to Polygons
Convert a subdivision surface to polygons | 13
Convert a subdivision surface to a NURBS surface
Modify > Convert > Subdiv to NURBS
Alt + ‘
Maya creates NURBS surfaces corresponding to the subdivision surface and
groups them.
To manipulate the resulting group of NURBS surfaces
■
Use Edit NURBS > Stitch > Global Stitch.
Stitching makes the patches deform as one surface, but the patches are still
regarded as separate surfaces when you assign materials. You can also use
the other stitching operations under the Stitch submenu.
■
Use Edit NURBS > Attach Surfaces.
Attaching creates a new continuous surface and is regarded as one surface
when you assign materials. You must apply Attach Surface repeatedly, one
patch at a time. Be aware that the order you attach patches affects the
placement of any textures you might apply to the surface.
Notes
■
The Subdiv to NURBS conversion does not convert the UVs of the
subdivision surface.
■
When a shader is assigned to a subdivision surface and the Subdiv to NURBS
operation is applied, the shaders are not transferred to the resulting surface.
Related topics
■
Convert a NURBS or polygonal surface to a subdivision surface on page
10
■
Convert a subdivision surface to polygons on page 11
■
Modify > Convert > Subdiv to NURBS
14 | Chapter 2 Subdivision surface conversion
Editing subdivision
surfaces
3
Create a new subdivision level
Subdivision surfaces let you have different levels of detail in different regions
of the same surface. Increasing the number of available control points (and the
level of detail possible) in a region is called refining a region.
While you can refine to 13 (0 to 12) levels of detail, try to only go to a finer
level when you cannot achieve the shape using coarser level vertices. Editing
at levels 3 and higher increases the complexity and decreases performance.
To refine a region on a subdivision surface
1 Select one or more components where you want more detail.
2 Select Subdiv Surfaces > Refine Selected Components.
A level of refinement is added to the subdivision surface. Each time you
refine, a new level is added.
15
After refining an area, you can spread the level of refinement to adjacent areas.
In the following example the center vertex is selected and expanded.
To expand a refined region
1 Select one or more components in the area you want more detail.
2 Select Subdiv Surfaces > Expand Selected Components to spread the level
of refinement to adjacent areas.
Troubleshooting Refine Selected Components
I want to undo a refinement I made to a subdivision surface?
➤
You cannot undo a refinement to a subdivision surface. However, you
can use Subdiv Surfaces > Clean Topology to remove refined components
that you created but did not edit.
Related topics
■
Switch between subdivision levels on page 16
■
Use polygon tools to modify a subdivision surface on page 20
■
Reduce the number of levels in a subdivision surface on page 26
Switch between subdivision levels
There are several ways to switch between the various levels of refinement on
a subdivision surface.
16 | Chapter 3 Editing subdivision surfaces
To...
Do this
Display a specific level so you can then edit
the Subdiv components.
Press the right mouse button on the subdivision surface and choose Display Level,
then the level you want to edit.
or
In the Attribute Editor for the subdivision
surface (the shape node), open the Subdiv
Component Display section and set the
Level attribute.
Display the next finer (higher numbered)
level from the current level.
Press the right mouse button on the subdivision surface and choose Display Finer.
or
Choose Subdiv Surfaces > Component
Display Level > Finer.
or
Press Page Up on the keyboard.
Edit the next finer level, and refine the
surface by one level if a finer level does not
already exist.
Press the right mouse button on the subdivision surface and choose Refine Selected.
or
Select components on the subdivision surface and press Ctrl + Down.
or
Choose Subdiv Surfaces > Refine Selected
Components.
Display the next coarser (lower numbered)
level from the current level.
Press the right mouse button on the subdivision surface and choose Display Coarser.
or
Choose Subdiv Surfaces > Component
Display Level > Coarser.
or
Press Page Down on the keyboard
Switch between subdivision levels | 17
To...
Do this
Edit the next coarser level, by selecting the
related subdiv component one level higher
in the subdiv level hierarchy.
Press the right mouse button on the subdivision surface and choose Select Coarser.
or
Choose Subdiv Surfaces > Select Coarser
Components.
or
Select components on the subdivision surface and press Ctrl + Up.
Related topics
■
Create a new subdivision level on page 15
Apply or remove a crease in a subdivision surface
You can modify the shape of a subdivision surface by applying a full or partial
crease to selected edges or vertices.
A full crease is a hard or sharp edge created at the selected edges, or a sharp
point created at the selected vertex. The surface moves very close or exactly
to the edge or vertex to form the crease.
A partial crease moves the surface closer to the selected edges or vertices
without ever reaching them. Partial creasing is useful when you want a softer
edge effect, such as at the edge of a character’s lips.
18 | Chapter 3 Editing subdivision surfaces
Maya displays creased edges as dashed lines to help you identify which edges
have been creased.
To...
Do this
Create a full crease.
Select the edge or vertices where you want
the crease and choose Subdiv Surfaces >
Full Crease Edge/Vertex.
Create a partial crease.
Select the edge or vertices where you want
the crease and choose Subdiv Surfaces >
Partial Crease Edge/Vertex.
Apply or remove a crease in a subdivision surface | 19
To...
Do this
Remove a crease.
Select the edge or vertices with the crease
and choose Subdiv Surfaces > Uncrease
Edge/Vertex.
Related topics
■
Use polygon tools to modify a subdivision surface on page 20
Use polygon tools to modify a subdivision surface
In addition to working on a subdivision surface when it is displayed in its
normal subdivision mode (standard mode), Maya lets you modify a subdivision
surface as if it were a polygon mesh by creating a substitute (proxy mesh) for
you to edit (“polygon proxy mode”).
Working with a subdivision surface in polygon proxy mode lets you use the
many polygon editing tools in Maya to modify and edit your subdivision
surface. You can easily switch back and forth between the two display modes
while you work on the surface.
To...
Do this
Switch to polygon proxy mode.
Choose Subdiv Surfaces > Polygon Proxy
Mode.
Maya creates polygonal mesh proxy from
the current subdivision level. Use the
polygon tools to edit the proxy.
Switch back to standard mode.
Choose Subdiv Surfaces > Standard Mode.
Maya applies changes you made to the
proxy to the subdivision surface.
20 | Chapter 3 Editing subdivision surfaces
Notes
■
The proxy mesh has no shading so you can see the resulting subdivision
surface.
■
Boolean, Bevel, and Reduce operations will not maintain standard mode
edits.
■
Some polygonal operations (for example, Combine) create a new polygonal
surface which has no subdivision surface associated with it. You will have
to create a new subdivision surface from the resulting polygonal surface.
■
Some polygonal operations modify your Standard mode edits. For example,
when subdividing a face in polygon proxy mode, the original standard
mode edits are copied onto each of the new faces. Edits and creases away
from the modified area are not affected.
■
Avoid changing the topology, such as subdividing a face, in areas where
you’ve edited components in Standard mode. Doing this can alter the
surface in unexpected ways. This is not a problem for edits to level 0
components, only at finer levels.
Troubleshooting polygon proxy mode
I can’t switch to polygon proxy mode?
➤
If you’ve used deformers, mapped UVs with history, or created other
construction history while in Standard mode, you cannot switch to
Polygon Proxy mode.
First delete construction history on the object (Edit > Delete by Type > History),
then try switching to Polygon Proxy mode.
Modify a subdivision surface using Soft
Modification
See the following:
■
What is soft modification? in the Deformers guide
■
Use the Soft Modification Tool in the Deformers guide
■
Create Deformers > Soft Modification
Modify a subdivision surface using Soft Modification | 21
Display the edited vertices on a subdivision
surface
You can set the display mode for a particular subdivision surface so that it
displays only the vertices that have been edited. This lets you more easily
perform further refinements or modifications on those regions that have been
previously edited.
To set the subdivision component display to show only edited vertices
1 Select the subdivision surface and ensure it is set to display vertices.
2 Perform any initial refinements or modifications to your subdivision
surface.
3 Select Subdiv Surfaces > Component Display Filter > Edits.
The display of vertices on the subdivision surface updates to display only
the vertices that have been edited.
4 When you want to display all the vertices again, select the subdivision
surface and then select Subdiv Surfaces > Component Display Filter > All.
Related topics
■
Create a new subdivision level on page 15
■
Switch between subdivision levels on page 16
■
Use polygon tools to modify a subdivision surface on page 20
Convert a subdivision component selection
You can convert an existing selection of subdivision components to another
component type. This saves you additional work in having to drop your
existing selection and then selecting the other component type.
For example, if you have already selected some edges on a polygon proxy
mesh, you can convert the selection to the faces associated with those edges
so that you can then modify the faces with the polygon editing features.
You can convert the selection to faces, edges, vertices, and UVs. In addition
you can expand a selection to select additional components that surround
the existing selection.
22 | Chapter 3 Editing subdivision surfaces
To convert an existing subdivision component selection to another component
type
1 Ensure one or more subdivision components are selected on your
subdivision surface.
2 Do one of the following:
■
Press Ctrl and right click on an edge of the surface and select the
component type you want to convert to from the marking menu that
appears.
■
From the Maya menus, select Subdiv Surfaces > Convert Selection to
<component type> and choose the component type that you wish to
convert to.
Related topics
■
Subdiv Surfaces > Convert Selection to Faces on page 54
■
Subdiv Surfaces > Convert Selection to Edges on page 54
■
Subdiv Surfaces > Convert Selection to Vertices on page 54
■
Subdiv Surfaces > Convert Selection to UVs on page 54
■
Subdiv Surfaces > Expand Selected Components on page 55
Attach subdivision surfaces
The edges of the surfaces will attach only if each surface has the same number
of polygonal edges at the base mesh level (level 0). If the surface does not have
the same number of edges, the objects are grouped, but the vertices and edges
of the surfaces do not merge.
Attach subdivision surfaces | 23
Attaching will destroy any deformer weighting on the selected surfaces.
To prepare subdivision surfaces to be attached
➤
Make sure the two surfaces you want to attach each have the same number
of polygonal edges at the base mesh (level 0). If they do not have the
same number of edges, the surfaces will be grouped, but will not merge.
Use Split Polygon or Delete Edge on the polygon proxy to create or remove
edges.
■
Switch to Standard mode if you are not already in it (Subdiv Surfaces >
Standard Mode).
■
If you are merging mirrored surfaces, delete the history on the mirror copy.
■
Subdiv Surfaces > Attach requires surfaces with consistently oriented
normals.
If one of the surfaces you wish to attach has its normals facing the wrong
direction, Edit > Duplicate it, Subdiv Surfaces > Mirror it in the opposite
direction, and then Modify > Freeze Transformations on the mirrored
object.
24 | Chapter 3 Editing subdivision surfaces
To attach subdivision surfaces
1 Select the surfaces you want to attach.
2 Select Subdiv Surfaces > Attach.
Notes
■
The edges of the surfaces will attach only if each surface has the same
number of polygonal edges at the base mesh level (level 0).
If the surface does not have the same number of edges, the objects are
grouped, but the vertices and edges of the surfaces do not merge.
■
Attaching will destroy any deformer weighting on the selected surfaces.
Related topics
■
Subdiv Surfaces > Attach on page 50
Use transformation tools with subdivision surface
components
Keep the following tips in mind when transforming subdivision surface
components.
■
Use the Modify > Transformation Tools > Move Normal Tool on individual
vertices one at time. Adjacent vertices on a subdivision surface may not
have common UV directions.
■
For best results, make large scale changes at coarser (lower-numbered)
levels and small-scale changes at finer levels.
■
To line up vertices, rotate an edge in the camera plane while approximating
it to be tangent to the surface.
■
To remove standard mode edits (transformations) on a vertex, select the
vertex and press the Delete key. This does not actually remove the vertex,
but moves it back to its original position.
Use transformation tools with subdivision surface components | 25
Improve interactive performance when editing
subdivision surfaces
To improve interactive performance when working with subdivision surfaces,
follow these tips:
■
Edit components in Standard mode rather than Polygon Proxy mode.
■
Keep the base mesh (level 0) simple. Add all detail by creating finer levels.
■
While modeling in Polygon Proxy mode, turn off the creation of UVs (No
UVs on Subd option on the polyToSubdiv node) to improve performance.
■
If you’re editing a number of control points at once you can control when
the surface updates by setting the Dependency Graph Evaluation settings
(Window > Settings/Preferences > Performance Settings). You can set the
draw refresh to occur as you drag the mouse, when you release the mouse,
or when you press an update button that appears. For more information,
see Window > Settings/Preferences > Performance Settings.
■
Use the Clean Topology operation to remove components that were created
but not edited. See Remove unused vertices from a subdivision surface on
page 27.
■
When binding a skeleton to a model, bind to a coarse level, such as level
0 or 1. See Bind subdivision surfaces to skeletons on page 39.
Related topics
■
Create a new subdivision level on page 15
■
Reduce the number of levels in a subdivision surface on page 26
■
Remove unused vertices from a subdivision surface on page 27
Cleaning up subdivision surfaces
Reduce the number of levels in a subdivision surface
You can reduce the number of levels in a subdivision surface using the Collapse
Hierarchy feature. Collapse Hierarchy maintains the original shape of the
26 | Chapter 3 Editing subdivision surfaces
surface, but moves the subdivision edits from finer levels to coarser levels,
making the coarser levels more dense as a result.
For example, you may want to make a topology change to a face that resides
at a finer level using the Edit Mesh > Split Polygon Tool. Topology changes
such as this can only be made at the base level (level 0) of a mesh, so collapsing
the hierarchy so the finer levels of detail appear at level 0 on the mesh would
allow you to switch to Polygon Proxy mode, and make the edit at the base
level.
To collapse subdivision levels
1 Select the subdivision surface.
2 Choose Subdiv Surfaces > Collapse Hierarchy >
.
3 Set the number of levels to collapse.
For example, if you collapse two levels, previous level 2 vertices become
level 0 vertices, level 3 vertices become level 1 vertices, and so on.
4 Click Collapse.
Related topics
■
Create a new subdivision level on page 15
■
Remove unused vertices from a subdivision surface on page 27
■
Subdiv Surfaces > Collapse Hierarchy on page 52
Remove unused vertices from a subdivision surface
You can use Clean Topology to remove any vertices that were created but not
used in a subdivision surface. Removing the extra, unused vertices helps to
reduce the file size and improve interactive performance.
For example, if have refined some regions of a subdivision surface, but moved
only a few of the vertices created by the refinement, Clean Topology can
remove the vertices you did not transform.
To automatically reduce unused vertices in a subdivision surface
1 Select the surface whose unused vertices you wish to remove.
2 Select Subdiv Surfaces > Clean Topology.
Remove unused vertices from a subdivision surface | 27
Any unused vertices are removed from the subdivision mesh.
Notes
Clean Topology only removes a vertice if it meets all three of the following
requirements:
■
No edits to the position of the vertice. That is, if a face has been moved
the associated vertices will not be removed.
■
No mapping or edits to the UV associated with a vertice. That is, if any
texture data is applied to the vertice it will not be removed.
■
No crease applied to the vertices or edges
There may be some vertices that Clean Topology cannot remove, even if they
meet these requirements, because the vertices are required for surface topology.
■
If you use Subdiv Surfaces > Clean Topology after creating a Blend Shape
or other deformation, you might get areas on the surface that have no
UVs. These areas are the result of vertices created when you weight the
deformer while the Clean Topology node still exists in construction history.
Avoid using Clean Topology after creating deformers. Also delete history
after using Clean Topology so that it does not interfere with the creation
of deformers.
Related topics
■
Reduce the number of levels in a subdivision surface on page 26
■
Improve interactive performance when editing subdivision surfaces on
page 26
28 | Chapter 3 Editing subdivision surfaces
Mapping and editing UVs
4
UV mapping for subdivision surfaces
UVs are two-dimensional texture coordinates that reside with the vertex
component information for polygonal and subdivision surface meshes. UVs
exist to define a two-dimensional texture coordinate system for a surface mesh
and to facilitate the placement of image texture maps on the surface. UVs act
as marker points that control which points (pixels) on the texture map
correspond to which points (vertices) on the mesh. Textures applied to polygon
or subdivision surfaces without UV texture coordinates will not render.
UV mapping is a process whereby you create, edit, and otherwise arrange a
flattened (two-dimensional) representation of the surface mesh over the bitmap
image to be used as a texture as it appears in the UV Texture Editor. The UV
mapping process results in a correlation between the image and how it appears
as a texture when mapped onto the three-dimensional surface mesh.
Although Maya creates UVs by default for many primitive types, you’ll need to
rearrange the UVs in most cases, because the default arrangement will usually
not match any subsequent edits to the model you may make. In addition, the
location of the UV texture coordinates do not automatically update when you
edit a surface mesh.
In most cases, you map and arrange UVs after you have completed your modeling
and before you assign textures to the model.
NOTE UV mapping is not necessary for creating and reshaping polygon and
subdivision surfaces. You only need to be concerned about UV texture coordinates
if you want to apply a texture to polygons.
Subdivision surfaces are similar to polygon surfaces in that they have UV texture
coordinates. However, subdivision surfaces have their own mapping and editing
29
operations, separate from the polygon operations. (It’s also possible to map
UVs with the polygon operations; see Edit UVs in Polygon Proxy Mode on
page 30.)
For subdivision surfaces, there are two UV mapping operations available:
Planar Mapping and Automatic Mapping. These items are located in the Subdiv
Surfaces > Texture menu. They are equivalent to the Planar Mapping and
Automatic Mapping features in the Create UVs menu. However, one key
difference is that the Subdiv Surfaces operations use only one UV set, whereas
polygons can have multiple UV sets.
To create a UV mapping arrangement that works best for your model, you
may need to map several times, until you find a mapping arrangement that
is suitable.
Related topics
■
Introduction to UV mapping
■
UV mapping tips
■
UV Texture Editor overview
■
Map UVs onto a subdivision surface on page 31
■
Edit subdivision surface UVs on page 34
Edit UVs in Polygon Proxy Mode
You can choose to create and edit UVs in either Polygon Proxy Mode or
Standard Mode.
When you use Polygon Proxy Mode, you have more UV editing features
available. However, because the UVs apply to the base mesh faces, textures
might appear twisted, especially in areas that are significantly more refined
than the base mesh. Editing UVs in Standard Mode (the default) ensures the
best visual results for textures.
To use UVs from polygon proxy mode
1 Switch to Polygon Proxy Mode (right click the subdivision surface and
choose Polygon).
2 Show the attribute editor and click the polyToSubdiv tab.
30 | Chapter 4 Mapping and editing UVs
3 Set the UV treatment attribute:
■
To use the UVs from standard mode, choose Keep Subd UVs.
■
To use UVs you edit while in polygon proxy mode, choose Inherit
UVs from Poly. The UVs will be copied back to the surface when you
exit polygon proxy mode.
■
To not have UVs on this surface at all, choose No UVs on Subd. This
removes any existing UVs on the surface.
The UV treatment attribute defaults back to Keep Subd UVs if you switch to
Standard Mode and then switch back to Polygon Proxy Mode. If you want to
edit UVs in polygon proxy mode again, you will need to change the UV
treatment attribute again.
Related topics
■
Use polygon tools to modify a subdivision surface on page 20
■
Edit subdivision surface UVs on page 34
Map UVs onto a subdivision surface
To select faces for mapping
➤
■
In Standard Mode, select a Display Level for the subdivision surface.
Switch between subdivision levels on page 16
Switch to a level that contains the faces you want to map. For example, if
you want to map the entire surface, switch to level 0 so you can select faces
across the entire surface.
For whichever level you choose, Maya converts the faces you select down
to the finest level and applies the mapping to those faces.
For example, if a face at level 0 has refinements to level 3, the mapping is
applied to level 3 faces. If there are no finer levels, the mapping is applied
to faces you selected on the current level.
➤
Select some or all of the faces on the surface.
If faces are not selected, no mapping occurs. Maya does not automatically
change to the face component mode, as it does when you try to map
polygons.
Map UVs onto a subdivision surface | 31
Planar Mapping assigns UVs to the surface by projecting them in a single
direction. Where the projection intersects the surface, Maya assigns UVs.
This mapping technique keeps the amount of UV shells low. However, it
usually results in UV shells that overlap because the projected UVs strike both
sides of the surface. As a result, you’ll probably need to separate the overlapping
UVs using Layout UVs.
To map UVs with Planar Mapping
1 Select Subdiv Surfaces > Texture > Planar Mapping >
.
2 Set the options. In most cases, you’ll need to at least change the Mapping
direction. Mapping direction controls the orientation of the mapping
plane.
3 Click Project.
To avoid overlaps, Automatic Mapping assigns UVs to the surface by projecting
them inward from multiple planes simultaneously. Where the projections
intersect the surface, Maya assigns UVs.
To map UVs with Automatic Mapping
1 Select Subdiv Surfaces > Texture > Automatic Mapping >
.
2 Set the options.
3 Click Project.
Although this mapping technique avoids overlapping UVs, it usually creates
many small UV shells. As a result, you may want to combine the small UV
shells into larger shells, for example, combining shells that correspond to
fingers together with the shell corresponding to the palm.
It’s easier to create textures for the model when the UVs of adjacent faces are
combined in a logical way. To combine UV shells, you use Edit UVs > Merge
UVs and Edit UVs > Sew UV Edges.
To resize or rotate the projection plane
1 Open the UV Texture Editor (Window > UV Texture Editor).
You should see the mapped UVs in the UV Texture Editor.
32 | Chapter 4 Mapping and editing UVs
2 Use the projection manipulator on the surface:
■
Drag the corners to resize the plane.
■
Click the red lines to show a transform manipulator tool, then use it to
rotate or flip the plane.
If the manipulator doesn’t appear, select subdPlanarProj in the Channel Box.
Examples
Manipulator
If you map a model of a long fish, the UV shell will be stretched by default to
fit in a square (see the following illustration). The stretched shape could result
in a texture that looks stretched on the model.
To avoid this problem, you can resize the projection manipulator until the
UV shell becomes more oblong, like the long fish model.
Map UVs onto a subdivision surface | 33
Selecting faces
In the figure on the left, level 0 faces were selected to be mapped. The resulting
UV shell is round, but there are also lines in the shape of an upside-down T.
These other lines correspond to the faces that were selected on level 0. They
appear only because those faces are still selected; select elsewhere and they
no longer appear.
In the right figure, level 2 faces were selected to be mapped. The resulting UV
shell is orange (meaning it’s selected) and is shaped like an arc. There is also
a UV shell in the shape of an upside-down T, with a section missing. This UV
shell corresponds to the level 1 faces. It still has the default UV arrangement
(an upside-down T), because it was not actually mapped; only level 2 faces
were mapped.
Related topics
■
Edit subdivision surface UVs on page 34
■
Subdiv Surfaces > Texture > Planar Mapping on page 43
■
Subdiv Surfaces > Texture > Automatic Mapping on page 45
Edit subdivision surface UVs
In the UV Texture Editor (Window > UV Texture Editor), there are separate
menus for polygons and subdivision surfaces. Use the menu items under the
Subdivs menu when you edit UVs on subdivision surfaces.
34 | Chapter 4 Mapping and editing UVs
The items in the UV Texture Editor’s Subdivs menu work the same as the
corresponding items in the editor’s Polygons menu.
You can use all other menu items, except the following:
■
View > View Contained Faces and View > View Connected Faces
To...
Do this
Show UV borders more clearly in the texture editor.
Select Display > Subdiv Surfaces UV Borders (Texture Editor).
Separate a UV shell into smaller shells.
In the UV Texture Editor, select edges
along the new border you want to create
and choose Subdivs > Cut UV Edges.
Attach separate UV shell manually.
In the UV Texture Editor, select the common edges of separate UV shells and
choose Subdivs > Move and Sew UV Edges
>
.
Turn off Limit Piece Size and click Apply.
Attach separate UV shells automatically.
In the UV Texture Editor, select all edges
of all UV shells and choose Subdivs > Move
and Sew UV Edges >
.
Turn on Limit Piece Size and set Number
of Faces to the minimum number of faces
a UV shell can have.
For example, if you set 2, only shells with
a number of faces equal to or less than 2
will be moved and sewn.
Click Apply.
Create an image of the UV layout on which
to paint a texture.
In the UV Texture Editor, select Subdivs >
UV Snapshot. The options are the same as
for Polygons > UV Snapshot.
TIP After performing a Move and Sew UV Edges operation, you can select the
history node (subdMapSewMove) in the Channel Box and adjust the Number
of Faces until you achieve the results you want.
Related topics
■
Subdiv Surfaces > Texture > Layout UVs on page 46
Edit subdivision surface UVs | 35
36
Sculpting surface meshes
5
Using the Sculpt Geometry Tool for subdivision
surfaces
The Sculpt Geometry Tool lets you manually sculpt NURBS, polygons, or
subdivision surfaces quickly with the stroke of a brush. You simply paint the
surface mesh using the Sculpt Geometry Tool to push or pull CVs (NURBS) or
vertices (polygons and subdivision surfaces) to achieve the shape you want.
The Sculpt Geometry tool is based on the Maya® Artisan™ tools. For more
information, see How Artisan brush tools work in the Artisan guide and the
related topics listed below which are found in the Polygon Modeling guide.
Related topics
■
Sculpt Geometry Tool overview
■
Sculpt a NURBS or polygon surface mesh
■
Smooth a surface mesh
■
Erase surface sculpting to an earlier state
■
Sculpt according to an attribute map on NURBS
■
Sculpt across seams and surface edges on NURBS
■
Keyframe sculpting changes
37
38
Subdivision surfaces tips
6
Bind subdivision surfaces to skeletons
For optimal performance, bind subdivision surfaces at a coarser level, and only
to one level. This usually results in adequate shape changes as the deformers
and joints move, and gives you fewer vertices to weight while maintaining
smooth interpolation.
The detail edits on finer levels tend to float or ride on the bound coarser level,
which helps skin details such as wrinkles and spots blend smoothly. For example,
as a finger joint bends, the wrinkles riding on top, modeled at a finer level,
stretch out.
Before you bind:
■
Freeze the transform on the subdivision surface to avoid unusual distortions
after the bind caused by non-uniform scaling of the subdivision surface.
■
Delete the history, especially if the subdivision surface has been bound
before.
■
Make sure you’re in Standard Mode.
Apply a deformer to a subdivision surface
When you apply a deformer to a subdivision surface selected as an object, the
deformer applies to the base (level 0) vertices. To apply the deformer to a
39
different level, select the vertices at that level and then apply the deformer.
You can assign blend shapes to vertices at any level.
■
If you delete a deformer and cannot switch to Polygon Proxy mode, delete
the history or find the input geometry in the dependency graph and delete
it.
■
Be careful if you have deformers on the same part of the surface at different
levels. Without parenting, deformer bases can produce double transforms.
■
Avoid having different levels of vertices in the same deformer. For example,
if you create a full crease at level 1 and apply a wire close to the object
surface (level 0), then move the wire or its vertices, the effect is very
different than if you apply the wire to level 1 vertices.
■
If the resulting deformation is undesirable, unbind, delete history, and
rebind at a finer level.
■
You may find that not all vertices are moved by a skeleton bound to a
subdivision surface at a level finer than 1 because all vertices at the level
were not selected or created before binding. To be sure all vertices are
selected, go to level 0 or 1, select all vertices, then refine to the required
level and select all.
■
A deformer at level 2 can override the deformation done at level 1. For
example, if you have a weighted cluster at level 1 and a blend shape at
level 2, the cluster deformation will disappear when the blend shape weight
is set to one. Try putting the blend shape at the finest level or on the same
level as the other deformers. You can also try changing the order of the
deformations.
■
A deformer at level 1 can move the surface out of a deformer at a finer
level (for example, lattices over the same parts of the surface at levels 2
and 3 and in the case of level 2 lattices, it pulls it out of the range of the
lattice at level 3).
■
Switching to Polygon Proxy mode when you have deformers and skeletons
on the subdivision surface unbinds the surface and loses weighting.
Creating blend shape and cluster deformers for subdivision surfaces
To create a blend shape for subdivision surfaces, you can either select the
object or select vertices on a given level. If you select the object, Maya blends
all vertices at all levels of the surface. If you select vertices of a specific level,
Maya blends only those vertices.
40 | Chapter 6 Subdivision surfaces tips
To create a cluster for subdivision surfaces, you need an extra row of vertices
completely surrounding the vertices you want in the cluster. These extra
vertices should not be in the cluster itself, but they must exist on the surface.
Without the extra row, you will experience problems weighting the vertices
in the cluster.
If the extra row does not exist, select the vertices and select Subdiv Surfaces
> Expand Selected Components.
Render subdivision surfaces
You can fine-tune the quality of the rendered surface by adjusting the settings
in the Tessellation section of the subdivision surface Attribute Editor.
Subdivision surfaces also support displacement mapping.
You can potentially create very finely tessellated polygons. As an extreme
example, a Uniform tessellation of a 10 quad base mesh, with Depth and
Sample Count set to 10 will produce about a billion triangles.
Format
Select one of the tessellation methods.
Uniform Uniform tessellation produces a polygon with an equal number of
faces for each of the subdivision surface’s base mesh faces (faces at level 0).
Adaptive Adaptive tessellation produces a polygon with an equal number of
faces for each of the finest level faces on the subdivision surface. The more
refinement you’ve made to a region of the subdivision surface, the more faces
the resulting polygon will have for that same region. Use Sample Count to
increase the tessellation.
Depth For Uniform tessellation only, set the level to determine how many
faces are to be used in the tessellation. For example, if Depth is 3, the number
of faces at level 3 are used in the tessellation.
Sample Count Specify how many times each face should be divided. Increasing
this value smooths the polygonal surface.
Render subdivision surfaces | 41
42
Subdivision surfaces menus
7
Subdiv Surfaces
Subdiv Surfaces > Texture > Planar Mapping
Maps UVs onto a subdivision surface by projecting along a direction.
Related topics
■
Map UVs onto a subdivision surface on page 31
Subdiv Surfaces > Texture > Planar Mapping >
By default, Smart Fit is turned on, which automatically positions the projection
manipulator. If you prefer to specify exact values for the projection manipulator,
you can turn off Smart Fit and change the values in the Projection Center,
Rotation, Width, and Height settings instead.
Fit to Best Plane If you want to map UVs for a portion of the object’s faces,
you can turn on Fit to Best Plane and the projection manipulator snaps to an
angle and rotation aimed directly at the selected faces.
Fit to Bounding Box This option works best when you are mapping UVs to all
or most of an object’s faces. It snaps the projection manipulator to fit within
the object’s bounding box. With this option on, you must choose one of the
Mapping direction options to establish the orientation of the projection
manipulator.
Mapping direction Choose an axis so that the projection manipulator is aimed
at the majority of the object’s faces. For example, a turtle model sitting on the
43
grid would have most of its faces pointing toward the Y axis, while a horse
model standing on the grid would have most of its faces pointing toward the
X or Z axis.
If most of the model’s faces point somewhere that is not directly along the X,
Y, or Z axis, you can choose Camera. This option positions the projection
manipulator based on the current active view.
Insert Before Deformers The Insert Before Deformers option is relevant when
the object has a deformation applied to it. If the option is turned off and the
deformation is animated, the texture placement is affected by the change in
vertex positions. This leads to “swimming” textures.
Turning this option on applies the texture placement to the object before the
deformation is applied to it. Basically, the texture placement dependency
graph node is inserted before the deformer dependency graph nodes and the
texture “sticks” to the geometry even after the deformation.
Image Center This value represents the center of the projected UVs. Changing
this value translates the center accordingly.
Image Rotation This value changes the angle at which UVs are rotated in the
2D window. Drag the slider or enter a value to rotate the image.
Image Scale This value represents the width (U) or the height (V) of the 2D
map relative to the 2D center point.
Keep Image Ratio Turn this option on to retain the width to height ratio of
the image so that the image does not distort. Turn it off so that the mapped
UVs fill the 0 to 1 coordinates in the UV Texture Editor.
If Smart Fit is turned off, the following options become available. You can
enter values to change the Projection Center, Rotation and Scale. After you
project a texture, you can change these values from the Channel Box or the
Attribute Editor, or use the corresponding manipulator handles to interactively
adjust the map.
Projection Center The projection center defines the point of origin in the X,
Y, or Z axis from where you can project a texture map. By default, this is the
center of the selected faces in the X, Y, or Z axis.
Projection Rotation Type a value to rotate the projection in the 3D view
around the X, Y, or Z axis which subsequently rotates the texture.
Projection Width Adjusts the width (U) of the projection relative to the 3D
projection axis.
Projection Height Adjusts the height (V) of the projection relative to the 3D
projection axis.
44 | Chapter 7 Subdivision surfaces menus
Subdiv Surfaces > Texture > Automatic Mapping
Projects UV texture coordinates onto the selected subdivision surface from
multiple angles simultaneously.
Related topics
■
Map UVs onto a subdivision surface on page 31
Subdiv Surfaces > Texture > Automatic Mapping >
Planes Select the number of planes you are projecting from. The more planes
used, the less distortion occurs and the more UV shells created. You can choose
a projection mapping based on shapes with 4, 5, 6, 8 or 12 planes.
Optimize
Select how you want the projection optimized.
Less Distortion Projects all planes equally. While this method provides the
best projection for any face, you may end up with more pieces. It is particularly
useful if you have a symmetrical model and you want the pieces of the
projection to be symmetrical.
Fewer pieces Projects each plane until the projection encounters a projection
angle that is not ideal. This can result in larger pieces, and fewer of them.
Shell Layout
Select where you want the UV pieces to lie in the texture space.
Along U Positions the pieces along the U axis.
Into Square Positions the pieces within the 0 to 1 UV texture space.
Scale mode
Select how you want the UV pieces scaled within the texture space.
None Performs no scaling.
Uniform Scales the pieces to fit the 0 to 1 texture space without changing the
aspect ratio.
Stretch to Square Stretches the pieces to fit the 0 to 1 texture space. The pieces
may become distorted.
Shell stacking
Determines how the UV shells get stacked in relation to each other when laid
out in the UV Texture Editor.
Subdiv Surfaces > Texture > Automatic Mapping | 45
Bounding Box Creates a rectangular bounding box around each UV shell,
then stacks the shells based on the borders of the bounding boxes. The UV
shells will have more space between them when this option is set.
Shape Stacks the UV shells based on the boundaries of each individual shell.
The UV shells can be more tightly arranged to fit into any available spaces
when this option is set.
Spacing Presets Maya puts a bounding box around each piece and lays out
the pieces so that the bounding boxes are very close together. If the shells end
up positioned exactly next to each other, two UVs on different shells can share
the same pixel and when painting a texture with the 3D Paint Tool,
overscanning can cause the paint to spill onto the adjacent shell.
To avoid this situation, ensure that there is at least a pixel between the
bounding boxes by selecting a spacing preset from this menu. Select a preset
that corresponds to your texture map size. If you don’t know the size, select
a smaller map, which will result in a larger spacing between adjacent shells
in UV space. (The smaller your map in pixels, the bigger the UV spacing must
be between bounding boxes.)
Select Custom to set the size of the space as a percentage of the map size (in
the Percentage Space box).
Percentage Space If you select Custom beside Spacing Presets, enter the size
of the space between bounding boxes as a percentage of the map size.
NOTE After performing an Automatic Mapping projection, you can modify the
Planes, Optimize, Layout, and Scale settings for the projection in the Channel Box.
However, do not modify these settings after painting a texture—the UVs may
change drastically.
Subdiv Surfaces > Texture > Layout UVs
The Layout UVs action automatically moves UVs so they don’t overlap in
texture space.
It is not absolutely necessary to keep UV pieces separate. For example, you
may want to overlap UVs so different faces use the same region of a texture.
46 | Chapter 7 Subdivision surfaces menus
In general however you should keep pieces separate for convenience and
clarity.
Related topics
■
Edit subdivision surface UVs on page 34
Subdiv Surfaces > Texture > Layout UVs >
The default settings give the best results in most situations.
Separate Select how you want to separate overlapping UV pieces.
Off
Does not separate overlapping pieces. Only the Scale option has an effect.
Folds Separates only pieces where the surface normals of overlapping pieces
point opposite directions. This method is faster, especially for larger models,
however, you may be left with overlapping UVs.
All Intersecting Separates all pieces where the UVs overlap.
Flip Reversed Turn this option on to flip pieces that have normals pointing
in opposite directions.
TIP If your model is symmetrical (for example, a character’s face), you can save
texture space by turning this option off and superimposing the UV pieces so they
occupy the same texture space.
Layout
Select where you want the UV pieces to lie in the texture space.
None Does not lay out pieces after they have been cut. Some pieces may lie
on top of others.
Along U Positions the pieces along the U axis.
Into Square Positions the pieces within the 0 to 1 texture space.
Scale
Select how you want the UV pieces scaled within the texture space.
None Performs no scaling.
Uniform Scales the pieces to fit the 0 to 1 texture space without changing the
aspect ratio.
Stretch to Square Stretches the pieces to fit the 0 to 1 texture space. The pieces
may become distorted.
Subdiv Surfaces > Texture > Layout UVs | 47
Spacing Presets Maya puts a bounding box around each piece and lays out
the pieces so that the bounding boxes are very close together. If the pieces
end up positioned exactly next to each other, two UVs on different pieces can
share the same pixel and when texture painting, overscanning can also cause
the paint to spill onto the adjacent piece.
To avoid this situation, ensure that there is at least a pixel between the
bounding boxes by selecting a spacing preset from this menu. Select a preset
that corresponds to your texture map size. If you don’t know the size, select
a smaller map, which will result in a larger spacing between adjacent pieces
in UV space. (The smaller your map in pixels, the bigger the UV spacing must
be between bounding boxes.)
Select Custom to set the size of the space as a percentage of the map size (in
the Percentage Space box).
Percentage Space If you select Custom beside Spacing Presets, enter the size
of the space between bounding boxes as a percentage of the map size.
Subdiv Surfaces > Full Crease Edge/Vertex
Full Crease Edge/Vertex modifies the appearance of a subdivision surface by
applying an edge shaped feature along the selected region of the mesh.
Applying a crease is useful when you want a sharp edge or transition on a
surface. You can also apply a partial crease, or uncrease previously creased
regions of the surface. The feature produced by a full crease appears more
pronounced on the surface than a partial crease.
Related topics
■
Apply or remove a crease in a subdivision surface on page 18
Subdiv Surfaces > Partial Crease Edge/Vertex
Partial Crease Edge/Vertex modifies the appearance of a subdivision surface
by applying an edge shaped feature along the selected region of the mesh.
48 | Chapter 7 Subdivision surfaces menus
Applying a crease is useful when you want a sharp edge or transition on a
surface. You can also apply a full crease, or uncrease previously creased regions
of the surface. The feature produced by a partial crease appears less pronounced
on the surface than a full crease.
Related topics
■
Apply or remove a crease in a subdivision surface on page 18
Subdiv Surfaces > Uncrease Edge/Vertex
Uncrease Edge/Vertex removes any previously applied full or partial crease
features from the selected region of a subdivision surface.
Related topics
■
Apply or remove a crease in a subdivision surface on page 18
Subdiv Surfaces > Mirror
Turn on the axes you want to mirror the surface along and click Mirror or
Apply. By default, Maya duplicates and flips the surface along the X axis.
If you transform the surface and then freeze the transformation (Modify >
Freeze Transformation) before mirroring, the surfaces will mirror relative to
the axis of choice.
Subdiv Surfaces > Uncrease Edge/Vertex | 49
If you intend to merge surfaces after mirroring them, line up the original
surface to the origin, freeze the transform, then perform the mirror.
Subdiv Surfaces > Attach
Merges two subdivision surfaces to create a new subdivision surface.
Related topics
■
Attach subdivision surfaces on page 23
Subdiv Surfaces > Attach >
Merge UVs Also Merges the UVs shared by the edges that you attach. If turned
off, the UVs are not merged and can be manipulated and edited independent
of each other.
Threshold Any vertices further apart than this distance will not be attached.
Set this value carefully. If it’s too small, no vertices will attach. If it’s too large,
the operation may attach vertices that you do not want attached.
Keep Originals Controls whether Maya keeps the original surfaces you are
attaching.
50 | Chapter 7 Subdivision surfaces menus
Subdiv Surfaces > Match Topology
Match Topology works in conjunction with Create Deformers > Blend Shape.
Ordinarily, you do not need to run Match Topology, because the Blend Shape
operation does it automatically.
Match Topology prepares multiple subdivision surfaces to be blended, such
as copies of a character’s head in different poses. In order to blend subdivision
surfaces, the surfaces must have the same vertices at all levels. Match Topology
adds vertices as needed to make the vertices match on all selected objects.
You do not need to do Match Topology yourself, because the Create Blend
Shape operation does it automatically. Do it only if you want to see the results
before the blend shape operation. Note, however, that doing Match Topology
yourself will lead to slower system performance when you blend shapes.
If you do Match Topology, first select two or more surfaces in any order. The
surfaces must have the same number of faces on level 0. They do not
necessarily need to have the same number of levels.
Match Topology only adds vertices. It does not match the vertex position edits
or creases from one surface to another.
Subdiv Surfaces > Match Topology | 51
Subdiv Surfaces > Clean Topology
Clean Topology is used to remove any vertices that were created but not
modified in a subdivision surface. Removing the extra, unused vertices helps
to reduce the file size and improve interactive performance.
Related topics
■
Remove unused vertices from a subdivision surface on page 27
Subdiv Surfaces > Collapse Hierarchy
Set the number of levels to collapse and click Collapse or Apply. For example,
if you enter 2, level 2 edits become level 0 edits.
Related topics
■
Reduce the number of levels in a subdivision surface on page 26
Subdiv Surfaces > Standard Mode
Standard mode is a display mode for subdivision surfaces that displays a
subdivision surface in its native form.
When working with a subdivision surface in Standard mode you can do the
following:
■
Add levels of refinement to selected regions of the subdivision surface
where you need more detail in your mode.
Adding levels of refinement adds vertices to the surface by subdividing the
selected region.
■
Switch between any existing levels of refinement.
■
Manipulate refined components (move, rotate, or scale) and keyframe the
surface.
■
Switch between Standard mode and Polygon Proxy mode at any stage of
modeling using the marking menu.
Related topics
■
Standard mode and polygon proxy mode on page 3
52 | Chapter 7 Subdivision surfaces menus
■
Subdiv Surfaces > Polygon Proxy Mode on page 53
Subdiv Surfaces > Polygon Proxy Mode
Polygon Proxy mode is a display mode for subdivision surfaces that displays
a polygon mesh that corresponds to the base mesh (level 0) for the subdivision
surface.
In Polygon Proxy mode you can do the following:
■
Edit the subdivision surface using the polygon tools.
■
Switch between Polygon Proxy mode and Standard mode at any stage of
modeling using the marking menu.
Related topics
■
Standard mode and polygon proxy mode on page 3
■
Subdiv Surfaces > Standard Mode on page 52
Subdiv Surfaces > Sculpt Geometry Tool
Use this tool to sculpt NURBS, polygons, and subdivision surfaces. This tool
is based on the Maya Artisan tools. For more information, see How Artisan
brush tools work in the Artisan guide and the related topics listed below.
For a description of the Sculpt Geometry Tool options see Mesh > Sculpt
Geometry Tool in the Polygon Modeling guide.
Related topics
■
Soft Selection overview
■
Sculpt a NURBS or polygon surface mesh
■
Smooth a surface mesh
■
Erase surface sculpting to an earlier state
■
Sculpt according to an attribute map on NURBS
■
Sculpt across seams and surface edges on NURBS
■
Keyframe sculpting changes
Subdiv Surfaces > Polygon Proxy Mode | 53
Subdiv Surfaces > Convert Selection to Faces
Convert Selection to Faces changes the current subdivision selection to any
faces that are associated with the selected subdivision components at the
current subdivision level.
TIP Many of the convert selection features are available from the context sensitive
subdivision surface marking menu when you press Ctrl + right-click whenever a
subdivision surface component is selected.
Subdiv Surfaces > Convert Selection to Edges
Convert Selection to Edges changes the current subdivision selection to any
edges that are associated with the selected subdivision components at the
current subdivision level.
TIP Many of the convert selection features are available from the context sensitive
subdivision surface marking menu when you press Ctrl + right-click whenever a
subdivision surface component is selected.
Subdiv Surfaces > Convert Selection to Vertices
Convert Selection to Vertices changes the current subdivision selection to any
vertices that are associated with the selected subdivision components at the
current subdivision level.
TIP Many of the convert selection features are available from the context sensitive
subdivision surface marking menu when you press Ctrl + right-click whenever a
subdivision surface component is selected.
Subdiv Surfaces > Convert Selection to UVs
Convert Selection to UVs changes the current subdivision selection to any
UV texture coordinates that are associated with the selected subdivision
components at the current subdivision level.
TIP Many of the convert selection features are available from the context sensitive
subdivision surface marking menu when you press Ctrl + right-click whenever a
subdivision surface component is selected.
54 | Chapter 7 Subdivision surfaces menus
Subdiv Surfaces > Refine Selected Components
Lets you edit the next finer subdivision surface level if it currently exists. If a
finder subdivision surface level does not exist, the Refine Selected Components
feature increases the level of detail possible for a subdivision surface by adding
one level of refinement to the subdivision surface based on the components
that were originally selected.
For example, if three faces are selected on a subdivision surface and you then
select Refine Selected Components, a level of refinement is added to the regions
contained within the three selected faces on the surface. That is, additional
faces get added to that region on the subdivision surface.
This lets you add increasingly finer features and details to a subdivision surface
in the regions that require it. If you require further detail, simply select Refine
Selected Components again with the components still selected and additional
detail will be added to the selected area.
Related topics
■
Create a new subdivision level on page 15
Subdiv Surfaces > Select Coarser Components
Lets you edit the next coarser level of a subdivision surface, by selecting the
related subdiv component one level higher in the subdiv level hierarchy.
Related topics
■
Switch between subdivision levels on page 16
Subdiv Surfaces > Expand Selected Components
Enlarges the region of subdivision refinement at a particular refinement level
based on the selection of refined components.
For example, if you have added detail to a region on a subdivision surface
using the Refine Selected Components feature and want to increase the level
of detail outwards, you can select the components on the border of the refined
region and then select Expand Selected Component to enlarge the area of
refinement.
Subdiv Surfaces > Refine Selected Components | 55
Related topics
■
Create a new subdivision level on page 15
Subdiv Surfaces > Component Display Level > Finer
Changes the display of components for the currently selected subdivision
surface so it displays the next finer (higher numbered) subdivision level from
whatever subdivision level is currently displayed.
For example, if the current subdivision level being display is 1, and you select
Component Display Level > Finer, the display of the surface updates to show
the next finer subdivision surface level (level 2).
Related topics
■
Switch between subdivision levels on page 16
Subdiv Surfaces > Component Display Level > Coarser
Changes the display of components for the currently selected subdivision
surface so it displays the next coarser (lower numbered) subdivision level from
whatever subdivision level is currently displayed.
For example, if the current subdivision level being display is 2, and you select
Component Display Level > Coarser, the display of the surface updates to
show the next coarser subdivision surface level (level 1).
Related topics
■
Switch between subdivision levels on page 16
Subdiv Surfaces > Component Display Level > Base
Changes the display of components for the currently selected subdivision
surface so it displays at the coarsest (level 0) subdivision level from whatever
subdivision level is currently displayed.
For example, if the current subdivision level being display is 2, and you select
Component Display Level > Base, the display of the surface updates to show
the coarsest subdivision surface level (level 0).
56 | Chapter 7 Subdivision surfaces menus
Related topics
■
Switch between subdivision levels on page 16
Subdiv Surfaces > Component Display Filter > All
Sets the display for selected subdivision surfaces so that all vertices on the
subdivision mesh are displayed. If the Subdiv Component Display Filter setting
for the subdivision surface was previously set to Edits, this display mode resets
the display so that all vertices are displayed. This feature controls the Subdiv
Component Display Filter attribute on the object’s shape node.
Related topics
■
Display the edited vertices on a subdivision surface on page 22
Subdiv Surfaces > Component Display Filter > Edits
Sets the display for subdivision surfaces so that only edited vertices on the
subdivision mesh are displayed. This display mode lets you more easily view
and select the vertices that have been modified at a particular subdivision
level. This feature controls the Subdiv Component Display Filter attribute on
the object’s shape node.
Related topics
■
Display the edited vertices on a subdivision surface on page 22
Subdiv Surfaces > Component Display Filter > All | 57
58
Index
4-sided polygons (quads), using
image scale (width, height),
change 44
7
A
Adaptive tessellation method
when rendering 41
Attach (Subdiv Surfaces menu) 50
attach subdivision surfaces 23
automatic mapping 32
Automatic Mapping (Subdiv Surfaces >
Texture) 45
B
base mesh 4
binding skeletons to subdivision
surfaces 39
binding, tips 39
blend shape, creating 40
C
clean up subdivision surfaces 26
cluster deformers, creating 40
Collapse Hierarchy (Subdiv Surfaces
menu) 52
collapse levels 27
combine subdivision surfaces 23
control points
increase 15
conversion of polygons, prepare for 7
Convert (Modify menu) 43
Convert Selection to Edges 54
Convert Selection to Faces 54
Convert Selection to UVs 54
Convert Selection to Vertices 54
crease
add or remove 18
cylindrical mapping
image center, changing 44
image rotation angle, change 44
D
dashed lines representing creases 19
deformer
apply to a subdivision surface 39
deformer dependency graph nodes
texture placement before
deformation 44
Depth tessellation method
when rendering 41
E
edges
attaching 23
create 18
dashed lines representing creases 19
put in mesh 8
edit
UVs 34
Edit NURBS menu
Sculpt Surfaces Tool 53
F
faces
select for mapping 31
selecting 34
use as few as possible 7
Fit to Best Plane
planar mapping option 43
Fit to Bounding Box
planar mapping option 43
flip a surface 49
Flip Reversed layout UVs option 47
floating edges 8
Format option 41
free points 8
59 | Index
full crease, create
18
M
H
history, deleting
39
I
Image Center
cylindrical, spherical mapping
option 44
Image Rotation
cylindrical, spherical mapping
option 44
Image Scale
cylindrical, spherical mapping
option 44
Inherit UVs from Poly 31
Insert Before Deformers
correct swimming textures 44
interactive performance, improve 26
K
Keep Image Ratio
Planar mapping option
Keep Subd UVs 31
L
lamina topology 8
Layout
layout UVs option 47
Layout UVs (Subdiv Surfaces >
Texture) 46
levels
create new 15
defined 4
keeping the same when
deforming 40
reduce number 26
switch 16
60 | Index
44
mapping
automatic 32
planar 32
Mapping direction
planar mapping option 43
Match Topology (Subdiv Surfaces
menu) 51
mesh
put in vertices and edges 8
Mirror (Subdiv Surfaces menu) 49
modeling workflow 2
modes, about 4
Modify menu
Convert 43
moving a planar projection 44
N
nonmanifold topology 8
normals
inconsistent 9
NURBS
prepare surface for conversion
9
O
Optimize automatic mapping option 45
overlapping
avoiding 32
P
partial crease, create 18
Percentage Space
automatic mapping option 46
layout UVs option 48
performance
increase with reshaping 26
planar mapping 32
Planar Mapping (Subdiv Surfaces >
Texture) 43
plane
for projecting UVs, resizing 32
projection, resize or rotate 32
Planes option 45
points
sharp, create 18
polygon mesh
converting to 9
put in vertices and edges 8
polygon model
checking how it will convert 3
polygon proxy mode
about 4
for polygon tools 20
use UVs 30
polygons
convert subdivision surface to 11
non-convertible 8
prepare 7
sculpt tool 37
projection
multiple planes, UV assigned by 32
plane, resize and rotate 32
snap to best plane 43
snap to bounding box 43
UV assigned by 32
Projection Center
planar mapping option 44
Projection Height
planar mapping option 44
Projection Rotation
planar mapping option 44
Projection Width
planar mapping option 44
proxy mode, polygon 4
Q
quads, using
7
R
refined region
create 15
expand 16
region
add control points 15
rendering subdivision surfaces
41
S
Sample Count tessellation method
when rendering 41
Scale
layout UVs option 47
Scale mode
automatic mapping option 45
Sculpt Polygons tool
about 37
Sculpt Surfaces Tool
options 53
selecting
faces 34
Separate layout UVs option 47
sharp point, create 18
Shell Layout
automatic mapping option 45
Shell stacking
automatic mapping option 45
skeletons, binding to subdivision
surfaces 39
smooth proxy 3
Spacing Presets
automatic mapping option 46
layout UVs option 48
spherical mapping
change image center 44
change image rotation angle 44
change image scale (width,
height) 44
standard mode
about 4
Subdiv Surfaces menu
Attach 50
Collapse Hierarchy 52
Match Topology 51
Mirror 49
Texture 43
subdivision surface
advantages of 2
apply deformer to 39
attach 23
bind to skeletons 39
clean up 26
convert to polygons 11
Index | 61
creating blend shapes, cluster
deformers for 40
duplicate and flip 49
edit UVs 34
levels of detail 15
map UVs to 31
mapping operations 30
modeling workflow 2
prepare for blending 51
prepare NURBS surface for 9
reduce number of levels 26
remove unused components 27
rendering 41
reshape 25
switch levels 16
tips for working with 39
UV projection 32
UV projection from multiple
planes 32
swimming textures
correct 44
swimming, correcting 44
twisted in polygon proxy mode 30
Texture (Subdiv Surfaces menu) 43
topology
clean 27
match 51
transformation tools 25
T
vertices
adding with Match Topology
during deformation 40
put in mesh 8
tessellation methods
for rendering 41
texture
placement before deformation
62 | Index
44
U
Uniform tessellation method
when rendering 41
UVs
borders 35
edit 34
mapping 29
mapping, how to 31
treatment in polygon proxy
mode 31
V
51