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

 Mode – Specifies where to get the ID from:

Face Material ID – The VRayMultiSubTex uses a polygon selection set information.
Object ID – The VRayMultiSubTex considers the Object IDs of the object when feeding the data (color or texture) to the material.
Random by Composite Key – The VRayMultiSubTex randomizes based on the selected option below.
Use ID Generator Texture – VRayMultiSubTex randomizes textures that allow integer input.

Random by Render ID – The VRayMultiSubTex assigns random colors based on RenderIDs (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.

Random by Instance ID – The VRayMultiSubTex assigns random colors based on the IDs of objects instanced with the particle instancer.

Random by Face Material ID – VRayMultiSubTex assigns random colors based on material IDs of the object's faces.

Random by Object ID – VRayMultiSubTex assigns random colors based on object's ID.

Random by Mesh Element – VRayMultiSubTex assigns random colors based on element (e.g. teapot lid, etc.) IDs of the object.

Random by Scene Name – The VRayMultiSubTex assigns random color/texture based on each object's full scene path. A full scene path means that it can be used for multiple objects with the same name but located on different levels/branches in the hierarchy of the scene, e.g. instances in different groups. This option preserves the same random result per object, even if one or more objects are added or deleted from the group.

Random Hue/Sat/Gamma – These three parameters control the randomization of the output color. Input value is percentage of the HSV/gamma range and specifies the maximum random deviation, where gamma range is fixed to [1/10,10]. See the example below for more information.

Seed – When the mode is set to Random by Node Name, this parameter allows the user to change the randomization pattern.

Loop Through Textures – This option works in Object ID mode. When the faces or objects assigned with VRayMultiSubTex map are more than the sub-textures in the map, the Loop Through Textures option goes through all sub-textures and once they finish, reverts to the first sub-texture, continuing until all faces or objects get a sub-texture. In Object ID mode all objects with assigned ID different than 0 get a sub-texture. The ones with object ID equal to 0 get the Default color.