V-Ray for Rhino Manual - Rum

The Characteristics of Rectangular Light
Rectangular Light plays a very important role in V-Ray. Despite its easy of use, it also gets a
smoother final result. Unlike the Spot Light, Rectangular Light doesn't have the worry about the
angle of the light. It also allows reflective material to bounce the light around the scene. Other
type of lights will not be seen in a reflective object. Below are some important characters about
Rectangular Light.
Size does matter
See images below and you will find the size of the Rectangular Light has an affect its intensity.
Shadow changes according to the size.
Larger Rectangular Light spreads out to a larger area, so the shadow is not as clear as you will get
from a smaller Rectangular Light.
Compare images below and you will see the differences between two different light sizes. The
one on the left is rendered with smaller light.
If you want to have a stronger shadow, we do not recommend you set the intensity way high and
make the light size really small. It's better to use a different light type in V-Ray. Please see
dialogue box of how to create a Parallel Light later.
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