V-Ray for Rhino Manual - Rum

Environment light source for semi-open space
We used open space to discuss Environment light source for last example. Now is time to use semiopen
interior space for this example to see differences between interior and exterior illumination
Open file: GI Environment-01.3dm. In the scene is a enclosed cube with an open on the right. There
are some objects placed on the wall next to the opening wall and there is no light in the box. All
objects used Val190 gray color, current GI Intensity is 2, color is light blue. Render it and you will get
the almost black image on the right. The result is due to no light in the scene and only a small
opening allows the Environment light come in.
Increase the GI Intensity to 4 and render it
again. The result is as below, a little bit
brighter this time
Increase the GI to 8 and render again. The
result is closer to reasonable illumination.
This example shows that Environment light in semi-open spaces usually doesn’t lead to a proper solution the
first time.
When begining to set up the illumination for interior space, a first step should be to check how many openings
in the scene allow environment light to come in. This includes transparent object like window or door. It is
also important to know how many lights are intended to be in the final scene, as well as what time of day the
rendering is meant to depict. These are all very helpful for setting the Environment light correctly.
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V-Ray for Rhino