Dear all,

My question is if I can set for different molecules in my system, how much they 
reflect light during ray-tracing

My current system is a protein which contains some cofactors.
The cofactors are coloured according to their B value and the protein is shown 
as a transparant grey surface.
When I start Ray-tracing, I get a quite nice picture. The problem is however 
that the transparant surface is reflecting the light, and becomes therefore at 
some places not transparant, which makes it kinda difficult to see the 
cofactors in the protein (which are the most important). I played around with 
all the spec_reflect, spec_direct settings. When I set spec_reflect to 0, there 
are no reflections anymore, but the image becomes rather dull.
I was wondering if it is possible to select somehow to make only the cofactors 
inside the protein reflect the light, but not the protein surface. In VMD you 
can do this for example by making molecules from different ‘materials’, e.g. 
you can make your cofactors from a reflective material, and your protein 
surface from a non reflective, transparant material. Is something similar 
possible in Pymol???

Thanks for your suggestions,

Floris
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