I came across this problem: when I transform my model with Z scale = -1, my transformed model is much darker when I use Gauraud shading, compared to Flat shading. Two pictures and the VTK model attached. The ‘Flat’ inverted model looks similar to the original. Not sure, but I guess this could be a VTK problem.
Any ideas? Should I report it there instead?
Untitled.vtk (893.2 KB)