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

 


Overview

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

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

See the Randomization Options page or the Courseware page for more information. 


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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.

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UI Paths

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||V-Ray Asset Editor|| > Textures (right-click) > Multi-Sub

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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.

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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 index 0. When using any other option, please ignore or remove the 0 index texture!

Use Face Material ID – When more than one material is applied to the different faces of the same object, SketchUp internally creates face IDs

are internally created

. 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

to the materials.
Note that faces inheriting such a material applied to the group instead will use ID 0. Faces with IDs that do not have a corresponding sub-color/texture use the Default Color.
Use Object ID

 –

– The Multi-Sub texture considers the Object IDs of the object when feeding the data (color or texture) to the material.

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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 index 0. When using any other option, please ignore or remove the 0 index texture!

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

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Random:

By

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 remain the same

.
Random by Random by

.
By Node Name – Generates a color index based on the name of the node that the texture is applied to.
By Face Material ID – Assigns random colors based on material IDs of the object's faces.
By Mesh Element – A mesh element is considered each island of connected mesh faces.
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

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.

By Object ID – Assigns random colors based on the object's ID.

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Hue/Saturation/Gamma Variation Gamma Variation – Active when the the Get ID from parameter parameter is set to some of the Random options Random options.  These These three parameters control post-process randomization of output color.  The The input value is the percentage of the HSV/gamma range and specifies the maximum random deviation, where the gamma range is fixed to [1/10,10]. See the Random the Random Hue/Sat/Gamma example below.

Seed Seed – Changes the randomization pattern.

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Example: Random Hue/Sat/Gamma

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No Random Hue/Sat/Gamma applied

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Hue = 1

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Saturation = 1

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Gamma = 1

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Example: Hue/Sat/Gamma Random by Face Material ID

 


The following example shows how the Random Hue/Saturation/Gamma changes the scene when the Get ID from is set to Random by Face Material ID.

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Hue = 1

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Saturation = 1

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Gamma = 1

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No Hue/Saturation/Gamma; Seed = 0

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Hue = 0.7, Saturation = 0.3, Gamma = 0.5, Seed = 5

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Hue = 0.7, Saturation = 0.3, Gamma = 0.5, Seed = 1

 
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Example: Hue/Sat/Gamma Random by Node Name

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The following example shows how the Random Hue/Saturation/Gamma changes the scene when the Get ID from is set to Random by Node Name.

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Hue = 1

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Saturation = 1

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Gamma = 1

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No Hue/Saturation/Gamma; Seed = 0

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Hue = 0.7, Saturation = 0.3, Gamma = 0.5, Seed = 5

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Hue = 0.7, Saturation = 0.3, Gamma = 0.5, Seed = 1

 
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Textures

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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.

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Notes

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  • Face IDs cannot be manually set by Rhino. Instead, they are automatically generated. Exceptions are Proxy .vrmesh or .abc objects created in other host applications.