Channels (metallic-roughness)

Layer stack

Tools

Export

How the Painter script works: it rebuilds this layer stack inside Substance 3D Painter 10.1+ via the Python API - folders, fill layers per channel, and generator masks. Mask generators (Metal Edge Wear, Dirt, ...) reference your shelf resources.

Base maps are baked, tiling, mesh-unaware textures - a starting base layer, not an editable smart material. You cannot author a real .spsm outside Painter; this builds the material in Painter instead.