Lightscape User Guide

Controlling Analysis Grids

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Maximum and Minimum

Displays the maximum and minimum values of the target quantity over the selected surface.

Use these values in conjunction with the average value to describe the uniformity of the distribution of light over the target surface.

Avg/Min, Max/Min, and Max/Avg

Displays different ratios of the average, minimum, and maximum values. These three ratios are used in conjunction with the average value to roughly measure the uniformity of the distribution of light over a selected surface.

Using I lluminance Rating

The illuminance rating is the fraction of the area of a surface that satisfies (or exceeds) a specified criterion. You can use this option to obtain more information about the distribution of light over a selected surface.

To select i lluminance rating criterion:

1.

Choose Light | Analysis.

The Lighting Analysis dialog appears.

2.

Click the Display tab.

3.

Select an item from the Quantity list.

6.

Enable the Percentage option in the Illuminance

Rating section, and then type a value between 0 and

100 in the Percentage box.

Percentage option

Percentage box

Threshold box

Threshold option

7.

Enable the Threshold option.

The threshold energy level appears in the Threshold box.

For instance, in the previous example, 46.4% of the light energy exceeds 300 lx.

Note: Alternatively, you can enter a threshold value and then enable the Percentage option to see the percentage of surface area where energy exceeds the specified threshold.

Controlling Analysis Grids

You can display a grid of uniformly spaced sample points and their corresponding luminance or illuminance values for a selected surface.

The Precision, Origin, and Spacing parameters control the grid’s position and lighting.

To display a lighting grid for a surface:

1.

Choose Light | Analysis.

The Lighting Analysis dialog appears.

2.

Click the Display tab.

4.

5.

Click the Statistics tab.

Click a point on a surface in your model.

Yellow crosshairs mark the selected point, and the selected surface is highlighted in green.

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