emil28092005 e740cf1214 fix: compute face normals when OBJ has no vn lines
- ObjLoader.ParseFace: if no normals in OBJ, compute face normal from
  first triangle using MeshMath.ComputeFaceNormal and apply to all face vertices
- cube.obj has no vn lines, so all faces previously had normal (0,1,0)
- Now each face has correct outward-facing normal for proper lighting
2026-06-18 12:42:13 +03:00
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