The V-Ray Light Material is a special material provided with the V-Ray renderer. This material is generally used to produce self-illuminated surfaces. This material's light emission can be used as indirect, as well as direct, illumination in the scene.
This allows for light sources of any shape. The Light Material may even be assigned at the object level and at the face level to self-illuminate only portions of a mesh.
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Node Input Sockets
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This section describes the input sockets of the node. These sockets have dedicated parameters, which are further described below.
Light Color – Allows a color node to determine the Light Color.
Color Multiplier – Allows a node to control the Color Multiplier Value; the socket accepts only float values.
Opacity – Allows a color node to determine the Opacity of the material.
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Click CTRL + H to expand all the hidden input ports of V-Ray nodes. Not all V-Ray input ports are exposed, to save space, but if you need a specific port that is not visible, use this shortcut to show all of them.
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Parameters
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Light Color – This parameter controls the color of the light material. A color node can be connected here.
Color Multiplier – A multiplier for the Light Color. An integer node can be connected here.
Opacity – A color to use as opacity for the material. Note that making the material less opaque does not affect the intensity of the self-illumination color. This is so that you can create perfectly transparent materials that nevertheless still emit light. A color node can be connected here.
Emit on Back Side – When enabled, makes the object emit light from its backside as well. If this is off, the back side of the material is rendered as black.
Compensate Exposure – Used when rendering with the V-Ray Physical Camera. When enabled, the intensity of the material is adjusted to compensate for the camera exposure.
Multiply by Opacity – When enabled, the color of the light material is multiplied by the opacity texture. Otherwise, the color and opacity act independently (so-called additive transparency).
