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    BUG: vtkOBJImporter does not handle multiple groups using same material · 517aed2b
    Bill Lorensen authored
    The original code assumed that each material could only be used by one
    actor (group). There is no mention of this restriction in the
    Wavefront obj specification. The solution is to use a map of vectors
    to map between material and actors.
    New test added.
    BUG: vtkOBJImporter fails if vt are present but texture indices not present
    Another bug was discovered while addressing the original issue. If
    texture coordinates are present via "vt" command but texture indices
    are not defined for the faces, the actor was skipped. The solution is
    to add a boolean variable that indicates whether texture indices are
    defined. If there are no texture indices, do not add TCoords to the