Why doesn't my Shader Graph see custom mesh stream data?

Mesh.SetVertexBufferParams must declare the attribute (UV2, Color, custom) and shader graph reads it via Custom Mesh node. Stream count and format must match exactly.

VertexAttribute enum?

VertexAttribute.Position, Normal, Tangent, Color, TexCoord0..7. Custom data goes in TexCoord4..7 conventionally; Shader Graph UV4..7 inputs read these.

Stream vs interleaved?

Stream argument groups attributes per buffer. Interleaved (stream 0) is GPU-friendly. Multiple streams allow partial updates of different attributes.

Fix: Shader Graph Custom Mesh Stream Not Read

Quick answer: Mesh.SetVertexBufferParams must declare attribute. Shader Graph reads via UV2/UV3/Color matching the slot.

Custom mesh with per-vertex weight in TexCoord4. Shader Graph UV4 input reads zeros. Vertex buffer params didn't include UV4.

The Fix

var mesh = new Mesh();
mesh.SetVertexBufferParams(vertexCount,
    new VertexAttributeDescriptor(VertexAttribute.Position),
    new VertexAttributeDescriptor(VertexAttribute.Normal),
    new VertexAttributeDescriptor(VertexAttribute.TexCoord0),
    new VertexAttributeDescriptor(VertexAttribute.TexCoord4, VertexAttributeFormat.Float32, 4)
);
mesh.SetVertexBufferData(vertexData, 0, 0, vertexCount);

// Shader Graph: UV4 input → pipe into Vertex Position offset / fragment

Buffer layout and Shader Graph slot must agree. UV4..7 are conventional homes for custom per-vertex floats.

Verifying

Per-vertex weight drives shader (e.g. emission). Without descriptor: zero.

“Buffer says UV4. Graph reads UV4. Data flows.”

Related Issues

For Shader Graph vertex offset, see vertex position. For SubGraph property, see SubGraph.

Match buffer to graph slot.