V-Ray for Rhino Manual - Rum

Environment Lighting
Lighting plays the key role in the rendering process. You simply can't get a good rendering result
without a good lighting environment.
Same as the real space lighting, light sources are divided into direct and indirect lighting. Direct
lighting is using the light command to create Rectangular Light, Omni Light, Spot Light and Parallel
Light and use directly on the object. Indirect lighting refers to any lighting which is from bouncing
light, or an environment
Lets do a test
Open file: Cup Illumination-01.3dm, there is no any light in the scene. Light source is from
Environment light.
1. So far the cup and ground are using the same
Val230 off white color. Render it with GI default
setting to 1 and get the result as image shown on
the right.
2. Increase the GI value to 2 without changing the
color, the result is shown on the right.
3. 01. Do not change the GI value and change
the Brightness to Val127 under the Texture Editor.
Render it again and the result is very close to the
first image on the top.
The reason for doing this test is to let users understand the importance between lighting and material.
Should the lighting be adjusted to accommodate material or should material be adjusted to accommodate
lighting?
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V-Ray for Rhino