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Material ID – Specifies a color ID for the current material.

Multimatte ID – Specifies a multimate ID used with MultMatte render element.


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Add to node:

vray addAttributesFromGroup "VRayMtl1" "vray_material_id" 1;

Attributes:

vrayColorId
vrayMaterialId

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Light Path Expressions Label

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With the help of the Light Path Expressions label, a Light Path Expression LightSelect RE can effectively be used as a custom Material Select RE, e.g. as an Indirect lighting only for materials with specific label value.

 

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Add to node:

vray addAttributesFromGroup "VRayMtl1" "vray_lpe_label" 1;

Attributes:

vrayLPELabel

 

 

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Image Added

Closed Volume Shading

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This attribute is available only for VRayMtl, and is a hint to the shader that the volume of the mesh is closed. It's currently used by the fog shader (when refraction is on), to prevent fog leaking in thin areas of the mesh.


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Add to node:

vray addAttributesFromGroup "VRayMtl1" "vray_closed_volume" 1;

Attributes:

vrayClosedVolume

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This extra attribute is available only for VRayMtl, VRayAlSurface and VRayBlend materials. It allows adding round edges using the material.  

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Enable Round Edges – 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 here may produce undesirable effects. 

Consider Same Objects Only – When enabled, the rounded corners are produced only along edges that belong to the same object which has the attribute applied. When disabled, rounded corners are 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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 Add to node:

vray addAttributesFromGroup "VRayMtl1" "vray_roundedges" 1;

Attributes:

vrayRoundEdges
vrayRoundEdgesRadius
vrayRoundEdgesConsiderSameObjectsOnly
vrayRoundEdgesCorners

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