Helix identification from a .pdb file

Question

[nathan1000]

Hello, I have a density map of a certain protein, and I'd like to be able to decide (approximately) for each voxel wether it is a "helix voxel" or not, based on the .pdb file of that protein. I am coding in python and using chimera, and I was wondering if someone here knows of an easy way to get this information using anything chimera has to offer. It sounds like a simple task, but I am really new to this stuff so I have a hard time getting it done.

Thanks