V-Ray for Rhino Manual - Rum

Emissive Materials
Open file: Cups-Emissive.3dm and we are going to show you how to create a self-illuminated
material. Select the green cup on the right. Under Properties>Material, click Edit to open the
Material editor dialog box.
Add Emissive Layer
1. Click on the + next to the Cup_Green to pull down the layers. Right click on Emissive Layers and
select Add new layer. You will see the new Emissive layer added to the right side.
Open the Emissive menu. Default set the color to white, intensity to 1 and Transparency color to
black. Click on Material Preview and you will see a completely white material ball. Render it and you
will get the image like the one on the right.
Self-illuminated material can make the object become a lightsource itself. It does not limit to a certain
shape like a regular light type does. Every part of the object can be illuminated and used as a lightsource.
Self-illuminated material is perfect to create objects like: light ball, light tube, light shade, stylish lighting,
cold light and lit screen. However, emissive materials should not be used as the primary lighting for a scene
If you are using a physical camera in your scene, you may notice that your light emitting materials render
black or darker than expected. This is because the physical camera reacts differently to light than a
regular camera does. Because of this you may have to make your light emitting materials significantly
brighter in order to be rendered by the physical camera.
V-Ray for Rhino 39