MultiSub

This page provides information on the V-Ray Multi-Sub Texture.

Overview

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

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

Any texture can be replaced via the Replace With New Texture () button, which activates when you select the texture to be replaced. If the texture is an instance, all copies are changed as well.

Parameters

Default Color – Allows the user to assign a color or texture. When a texture is selected, it overrides the color as long as the texture checkbox is enabled.

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

When adding subtextures to the Multi-Sub texture, the first one always starts with an index of 0. Note that only Face material ID utilizes the index 0. When using any other option, please ignore or remove the 0 index texture!

Face material ID – When more than one material is applied to the different faces of the same object, Revit internally creates face IDs. If all those materials share the same Multi-Sub texture, V-Ray considers the face IDs when feeding the data (color or texture) to the materials.
Note that faces inheriting such a material applied to the group instead will use ID 0. Faces with IDs which do not have a corresponding sub-color/texture use the Default Color.
Object ID – The Multi-Sub texture considers 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 project editing. For example, if an object is added, removed, or renamed, the colors remain the same.
Random by Render ID – The Multi-Sub texture assigns 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.
Random by Instance ID – Assign random colors based on InstanceID (works for Alembic instances and VRayInstancer source objects).
Random by Face Material ID – Assigns random colors based on material IDs of the object's faces.
Random by Object ID – Assigns random colors based on object's ID.

Loop Textures – When enabled and the number of shaded IDs exceeds the number of IDs in this texture, the geometry IDs are wrapped to fit in the available range.

Hue/Saturation/Gamma Variation – Active when the Get ID from parameter is set to some of the Random options. 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/Gamma example below.

Seed – Changes the randomization pattern.

Textures

Add Texture – Adds a new sub-texture to the texture list.

Used – This checkbox enables the sub-texture for rendering.

Value – For modes that use IDs, this value specifies the ID that corresponds to each texture.

Example: Multi-Sub texture On vs Off

This example shows the effect of a Multi-Sub texture usage. A Bitmap texture is plugged in the Default Color slot of the Multi-Sub texture. Get ID is set to Random by Render ID.

off

on