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The V-Ray MultiSub Tex texture distributes multiple textures to many objects via one single material based on specified IDs or a random distribution.

In the image shown here, MultiSub Tex's Get ID from parameter has its type set to Object ID. Each part of the ball is assigned a texture. The MultiSub Tex is then assigned to the diffuse channel of a single V-Ray Material.

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Parameters

 

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Default Color – Specifies a default color or texture for objects without Object IDs.

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Face material ID – When more than one material is applied to the different faces of the same object, SketchUp will Rhino internally create creates face IDs. If all those materials share the same VRayMultiSubTex, V-Ray will consider the face IDs when feeding the data (color or texture) to the materials.
Object ID – The VRayMultiSubTex will consider the Object IDs of the object when feeding the data (color or texture) to the material.
Random by node handle – Each node is assigned a unique number (or, "handle") when it is created. This option generates the color index based on that node ID. It is useful because the node handle survives through scene editing. For example, if an object is added, removed, or renamed, the colors will remain the same.
Random by render ID – The VRayMultiSubTex will assign random colors based on RenderIDs that are internally generated by V-Ray.
Random by node name – Generates a color index based on the name of the node that the texture is applied to. 

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