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Get ID from – Specifies the meaning of the ID parameters.

Face material ID – Considers the face IDs of the object when feeding the data (color or texture) to the material.
Object ID – Considers the Object IDs of the object when feeding the data (color or texture) to the material.
Random – Randomly chooses IDs when feeding the data (color or texture) to the material.

Seed – Allows you to change the randomization pattern.

Randomization – This section is active only when the Random mode is selected. Specifies the elements, based on which the colors of the texture will be randomized.

By name – Generates a color index based on the name of the node that the texture is applied to. This allows the color to remain consistent if the object is merged into another scene, or X-Ref'd etc.
By instance ID – Assigns random colors based on InstanceID (works for Alembic instances and , VRayInstancer source objects, VRayEnmesh, and Chaos Scatter).
By object ID – Assigns random colors based on object's ID.
By element – Assigns random colors based on element (e.g. teapot lid, etc.) IDs of the object.
By particle ID – Assigns random colors based on ParticleID (works for VRayInstancer source objects and Thinking Particles).
By node handle – Each node in 3ds Max is assigned a unique number (a 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 - e.g. if you add/remove other objects, or rename them, you will still get the same colors.
By face ID – Assigns random colors based on material IDs of the object's faces.
By render ID – Assigns random colors based on RenderIDs.
By user ID – Assigns random colors based on user's ID. The user ID is defined through the By user ID settings button, and then from Object Properties > User Defined, where a value for it is selected.

By user ID settings – Active, when By user ID mode is enabled. It defines the user ID (int, float, string).

Random Hue/Sat/Gamma – These three parameters control post-process randomization of 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 Random Hue/Sat/Gammaexample below.

Total IDs – Can be used to set the number of sub-textures.

Delete unused – Deletes disabled slots from the list.

Batch load – Loads multiple bitmaps at once.

Loop Through Textures – This option works with Face material ID and Object ID modes. When the objects assigned with VRayMultiSubTex map have IDs outside the interval of valid sub-texture IDs, the Loop Through Textures option calculates a wrapped version of these IDs that fit in the interval. Then it picks the corresponding sub-texture. For example, if an object with an ID 5 is assigned a VRayMultiSubTex and the interval of valid sub-texture IDs is [1:4], it is looped and is rendered with some of the sub-textures. See the Loop Through Texture example below.

Blend color and texture – When enabled, the alpha of the sub-textures is used to blend between the color for the respective material ID and the texture color. When disabled, the texture alpha is returned directly and the color specified in the VRayMultiSubTex texture itself for the given material ID is ignored.

Default Color – A default color or texture for objects whose IDs cannot be matched with a sub-texture ID (with or without looping). Works only in Face material ID and Object ID modes.

ID (1-20) – Specifies a color or a texture to be assigned to the material when it is assigned on an object with the current ID.

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