9. Things to watch on export and import

Normals can be rebuilt along the way.

Normals after import A Use the normals in the file B Recompute C Recompute, split at a small angle D Mirrored (negative scale), face order not fixed

Light direction (left/right) Light height Toon shading Toon threshold Show vertex normals

Triangles: · Drag the view to turn it.

A: the normals stored in the file (here, custom normals that clean up the shading) are used as is.
B: if the importer recomputes them, the custom normals are lost and the blotchy shading returns.
C: recomputing with a small split angle turns smooth areas into corners.
D: if the mesh is mirrored but the face order (vertex order) is not fixed, the normals point inward and the lighting is reversed.