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"ray" creates a ray-traced image of the current frame. This can take some time (up to several minutes, depending on image complexity).
ray [width,height [,renderer [,angle [,shift ]]] angle and shift can be used to generate matched stereo pairs
ray ray 1024,768 ray renderer=0
cmd.ray(int width,int height,int renderer=-1,float shift=0)
renderer = -1 is default (use value in ray_default_renderer) renderer = 0 uses PyMOL's internal renderer renderer = 1 uses PovRay's renderer. This is Unix-only and you must have "x-povray" in your path. It utilizes two two temporary files: "tmp_pymol.pov" and "tmp_pymol.png".
"help faster" for optimization tips with the builtin renderer. "help povray" for how to use PovRay instead of PyMOL's built-in ray-tracing engine.
How do I ray trace a publication-ready (~300dpi) image using PyMol?
This answer is in the Advanced Issues (Image Manipulation Section).