In Maya LT:
- Merge geometries.
- Map UVs (automatic is pretty good).
- Clean up geometry.
- Export to FBX, for Substance Painter.
- Export to OBJ, for conversion to glTF.
In obj2gltf
stable (not the online version, which drops UVs), convert to glTF.
Import FBX to Substance Painter.
- Set shaders to OpenGL.
- Set texture resolution to anything, probably 512–2048.
- Export textures with UE4 OcclusionRoughnessMetallic configuration, changing from DirectX to OpenGL normals in Config.
Manually add samplers
, textures
, images
, and update materials
in the glTF file.