2011

Table Of Contents
a discrete position and affect the entire scene. You can turn the display of
light glyphs on or off while you work. By default, light glyphs are not plotted.
Photometric Lighting Workflow
For more precise control over lighting, you can use photometric lights to
illuminate your model. Photometric lights use photometric (light energy)
values that enable you to define lights more accurately as they would be in
the real world. You can create lights with various distribution and color
characteristics, or import specific photometric files available from lighting
manufacturers.
Photometric lights can use manufacturers' IES standard file format. By using
manufacturers lighting data, you can visualize commercially available lighting
in your model. Then you can experiment with different fixtures, and by varying
the light intensity and color temperature, you can design a lighting system
that produces the results you want.
Sun and Sky
The sun is a special light similar to a distant light. The angle of the sun is
defined by the geographic location that you specify for the model and by the
date and time of day that you specify. You can change the intensity of the
sun and the color of its light. The sun and sky are the primary sources of
natural illumination. With the
sun and sky simulation on page 2056, you can
adjust their properties.
In the photometric workflow, the sun follows a more physically accurate
lighting model in both the viewport and the rendered output. In the
photometric workflow, you can also enable sky illumination (through the sky
2006 | Chapter 44 Add Lighting to Your Model