Removing an obsolete header comment in the PPM writer
Correcting the handling of facet indices when normals or texture coordinates are empty in the OBJ reader.
- In Image_AlienPixMap.cxx, the unused header comment is removed.
- In Graphic3d_Aspects.hxx, the default viewer settings comment is updated.
- In RWObj_Reader.cxx, additional checks are added
to correctly parse OBJ face definitions with empty texture and normal indices.