strange colors in PDF output (but OK for PostScript)
Dear gl2ps developers,
First of all, thanks a lot for your great job on gl2ps.
I am getting a strange difference between PostScript and PDF outputs. As you can see in the attached files, the PostScript ouput (test.ps) of gl2ps looks fine when compared to the OpenGL version (test.png), however just switching to the PDF backend gives the strangely colored test.pdf file.
After looking at various options, this could be due to a different interpretation of normal orientations by the PDF backend compared to the PS backend of gl2ps. But I am not sure. Any hints of what is going on would be greatly appreciated.