[PyMOL] How Pymol define the smooth_triangle in Povray file?

[caoch]

hello all:

  I am a new user of Pymol. I rended Poymol ribbons with Povray. 
furthermore i want to modify the Povray scene. It seems Poymol using 
smooth_triangle object to get the ribbon image.But I don't know how Pymol 
define the corner vector of smooth_triangle using coordinate file such as 
PDB. I also don't know how Poymol itself define helix or sheet.

 i will be very appreciated for any advice.

                                               caoch
                                            tokyo institute technology  
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ca...@cherry.bio.titech.ac.jp

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ca...@cherry.bio.titech.ac.jp