Please keep in mind that my background is neither in computer programming, nor in structural biology, hence my lack of understanding of basic concepts as the structure/format of a PDB file.
I started with a PDB file from the PDB database. I opened it in PyMol, and deleted the parts I did not need and saved it as a PDB. Then, I loaded it into Chimera and prepared a symmetrical molecule with C9 symmetry, and again saved it as a PDB. When I opened that with either Pymol or ePMV in Blender, I only saw one of the monomers. Then, I went back to chimera, and combined all models listed in the PDB into a single model, and saved it as a PDB. Now, if I import it to Blender with ePMV, I see nothing if I do not choose lines or PointClouds. In other words, I cannot import it as a cartoon model, although Chimera and PyMol have no problem displaying it as a cartoon.
Any suggestions to fix this?
Edit: I just saw that in the terminal this is displayed for all chains: "no secondary structure set for chain: n !"