How to specify User channels as RGBA in Material Layering shaders?

Question

Hi, I'm looking for information about a feature listed in the release notes for Painter 8.2.

https://helpx.adobe.com/substance-3d-painter/release-notes/version-8-2.html

[Shader] Allow to set User channels as RGBA in Material Layering shaders
When settings the Texture Set channels configuration inside a shader for material layering, it is now possible to specify the format of the channel to deviate from the default value. This allow notably to request color user channels instead of grayscale only.

Is there documentation on how to specify this? I've searched around in the Shader API docs but so far haven't spotted anything related to it. Is the format specified soley in the shader code (if so, how?) or do I need to do anything else when creating my layering materials in Designer (such as specifying a Format other than Default in the Integration Attributes of the output node)?

Any help is greatly appreciated.

Léna Piquet Froyok · Accepted Answer

Hi,

You can specify the data type of a channel by using the format keyword in the shader header when defining the stack layout. Here is an exemple:

//: stacks [
//: {
//: "id": "MaskRGB",
//: "channels":
//: [
//: {"id": "blendingmask", "format": "RGB8"}
//: ]
//: }
//: ]

You can find this information on the syntax in the documenation as well: https://adobedocs.github.io/painter-shader-api/api/parameters/layering_declare_stacks/

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