[Chimera-users] Electrostatic coloring on slice surface

Tom Goddard goddard at cgl.ucsf.edu
Tue Mar 20 09:53:25 PDT 2007

Hi Boaz,

  When you color a surface (e.g. GRASP surface) using electrostatic 
potential with the Surface Color tool it does show the correct colors on 
the slice if you are clipping the surface.  This is described in the 
guide to volume data display


The colors are only assigned at the triangle vertices of the slice 
surface which can be seen by switching to "mesh" display in the Surface 
Capping dialog.  To get finer resolution coloring increase the "Mesh 
subdivision factor" in the Surface Capping dialog from 1.0 to say 3.0 
(giving ~9x more vertices).  Press the Enter key after changing the 
number to see the effect.


Boaz Shaanan wrote:
> Hi Tom,
>  Thanks a lot. While we're at it I have another question related to 
> surface rendering. In the 'colour surface' window there is button that 
> says 'colour sliced ...'. Does that mean that if I covered a molecule 
> with surface and mapped a Delphi calculated potential map onto it, if 
> I then slice into the molecule, the surface covering this slice will 
> show the potential correctly ? That would be very nice but I'm just 
> wondering whether I can believe what I see. Grasp used to do this 
> nicely but I'd like to use chimera (and grasp is dead anyway as far as 
> I'm concerned - I don't have SGI's). I'd appreciate your input.
>  Cheers,
>                 Boaz

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