[Chimera-users] Flip handedness of map

Tom Goddard goddard at cgl.ucsf.edu
Mon Jan 21 14:53:39 PST 2008

Hi Jean-Francois,

  You can still enter a negative voxel size along one axis in the volume 
dialog Coordinates panel.
Although the voxel size field will show just one number if all 3 axes 
have the same voxel size, you can
enter 3 numbers separated by spaces, for example,  2.52 2.52 -2.52.

  I noticed that surfaces are dark if you do this.  If you turn off the 
"two-sided lighting" option in the volume dialog under surface and mesh 
options the lighting will be bright again.  I believe this undesirable 
effect is caused by the traversal of the 3 vertices of a surface 
triangle switching from counterclockwise to clockwise relative to the 
surface normal.

  Thanks for pointing out this trick for flipping map handedness.  I 
wanted to do this a few days ago and didn't know how, even though I 
wrote the code.


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