Shader Graph Custom Support

Extend OptiDraw into any custom Shader Graph pipeline — node wiring, data channel mapping, and UDIM configurations.

Using OptiDraw with Custom Shader Graphs

If you have an existing Shader Graph and want OptiDraw to drive its data, you only need to wire the correct data channels into your graph. OptiDraw writes to standard Unity mesh data channels — no custom nodes or extensions required.

Channel Mapping

Vertex Paint → Vertex Color node (RGBA) in Shader Graph
Splat weights (layer 1-2) → UV channel 2 node (RG = layer1 weight, BA = layer2 weight)
Splat weights (layer 3-4) → UV channel 3 node (RG = layer3 weight, BA = layer4 weight)
Texture Paint (Albedo) → Sample Texture 2D from the OptiDraw baked albedo texture slot
PBR Paint (Normal) → Sample Texture 2D → Normal Unpack → Normal node

Interactive Tag Inspector (3 items)

Tag [A]

Vertex Color Node Setup in Shader Graph

AVertex Color Node

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In your Shader Graph, simply use the Vertex Color This node acts as a multi-channel mask (Red, Green, Blue, and Alpha).

Interactive Tag Inspector (4 items)

Tag [A]

Splat Weight UV Channel Sampling & Multi-Texture Lerp Nodes

ASplatmap Property

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Acts as the "canvas" to store the painted data, which is then used for masking. This property must use the Internal Reference _SplatMap so the tool can identify and write data to it.

Precompute Heights & Depth Blend Configuration

Interactive Tag Inspector (2 items)

Tag [A]

Debug View Support Keyword & Channel Switching Nodes

AToggle Debug Reference

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_DEBUGDRAW The main keyword to toggle Debug Mode on or off.

Shader Graph Setup Steps

1In your Shader Graph, add a Vertex Color node and plug RGBA into your desired surface properties
2For splat paint: add a UV node set to channel 2, split RGBA, and use each channel as a lerp weight between texture samples
3For texture paint: add a Texture2D property named _OptiDrawAlbedo (OptiDraw auto-binds to this name when it detects the property)
4Save the Shader Graph and assign to your material
5In OptiDraw Inspector, select your mesh — the tool detects the Shader Graph properties and maps paint output accordingly

Name your Texture2D properties with the _OptiDraw prefix and OptiDraw will auto-bind paint output textures to them. Supported: _OptiDrawAlbedo, _OptiDrawNormal, _OptiDrawMask.