VRay materials don’t have a self-illumination setting like standard materials do. Sometimes you may need a vray material to provide its own illumination and there is a way to do that. If you make a vraylight material and assign a map to the color channel, you achieve a self-illuminated material in VRay. A VRaylight material looks practically identical to a standard material with self illumination at 100.
A V-Ray tutorial from trinity3d.com:
Many of you out there have probably run into the problem of needing motion in a GI lit scene. Usually this results in splotchiness and noise that swims around. V-Ray 1.50 has come up with a solution to address this. You can pre-calculate, and blend your irradiance maps together with the following steps.
First, make an animation with motion in it. I’ve made a simple reactor simulation for this scene. Here are the steps for creating that:
