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This page provides information about the Light node in V-Ray for Cinema 4D.

 


Overview

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The Light node is used for producing self-illuminated surfaces. This material's light emission can be used as indirect, as well as direct, illumination in the scene.

This allows creating light sources of any shape. It can be assigned at the object level and at the face level to add self-illumination only to portions of a mesh.


If you wish to disable the material preview or adjust its quality to save processing power, you can do so from the Material Node.

 
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Parameters

 

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Light Color – Controls the color of the Light material.

Color Multiplier – A multiplier for the Light Color.

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 texture node can be connected.

Emit on Back Side – When enabled, makes the object emit light from its back side as well. If this is off, the material is rendered as black on the back side.

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 Light Color is multiplied by the Opacity. Otherwise, the Light Color and Opacity act independently (so-called additive transparency).

 
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Options

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MATERIAL ID

Material Id Enabled – Enables the use of Material ID.

Material ID – The color used by the Material ID render element. You can also use a shader here.

Multimatte ID – The integer ID of the material to be used by the Multi Matte render element.

ROUND EDGES

Round Edges Enabled – Enables the round edges effect which uses bump mapping to smooth out the edges of the geometry during render time.

Radius – Specify a radius (in world units) for the Round Edges effect. Since the actual geometry is not being changed and only the normals of the faces are affected, large values may produce undesirable effects.

Consider Same Object Only – When enabled, the rounded corners are produced only along edges that belong to the object, which has the attribute applied. When disabled, rounded corners are also produced along edges formed when the object with the attribute intersects other objects in the scene.

Corners – Choose which edges are considered in the calculation. Possible options are:

Covex and Concave – Considers all edges.
Convex Only – Only applies Round Edges effect to edges with convex angles.
Concave Only – Only applies Round Edges effect to edges with concave angles.

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