Splat Painting not Supported by Mesh

Error: Splat Painting not Supported by Mesh

This warning appears in the OptiDraw Inspector when you switch to Splat Paint mode on a mesh that does not have the required UV channels. Splat Paint writes blend weights to UV2 and UV3 — if those channels are absent in the mesh asset, OptiDraw cannot store the data.

Diagnosis

• Select the mesh asset in the Project window and open the Model Import Settings
• In the Geometry tab, check whether Generate Lightmap UVs is enabled — this creates UV2, which OptiDraw can use
• Alternatively, check the mesh in a modeling app: it must have at least a second UV set for Splat Paint

Fix Options

1. 1Option A — Enable UV2 generation: In the mesh's Import Settings → Geometry, enable 'Generate Lightmap UVs'. Re-import the mesh. OptiDraw will detect UV2 and enable Splat Paint.
2. 2Option B — Add UV2 in your DCC: In Blender/Maya, duplicate UV0 into a second UV channel (UV2), export the FBX with both channels included.
3. 3Option C — Switch engine: If adding UV channels is not feasible for this mesh, use Vertex Paint instead. Vertex colors achieve similar multi-layer blending in shaders with fewer mesh requirements.