Re: [PyMOL] Volume - ray - rendering

[Thomas H. <tho...@sc...>]

Hi Anna,

the "ray_volume" setting is really just a hack or workaround to blend the OpenGL rendered volume with the ray traced image of the rest of the scene, and it has it's limitations. My recommendation is not to ray trace at all, but instead take advantage of our high resolution OpenGL shader rendering which mimics ray tracing very close. Only shadows are not supported. You can render into a larger image with "draw 1000,1000".

Example:

# mimic ray tracing (most of these are already default)
set use_shaders
set ray_shadow, 0
set stick_as_cylinders
set ribbon_as_cylinders
set line_as_cylinders
set nonbonded_as_cylinders

# load example data
fetch 1rx1, mol, async=0
fetch 1rx1, map, async=0, type=2fofc
volume vol, map
show cartoon
show sticks, organic
orient organic
clip slab, 12

# increase volume quality
set volume_layers, 1000

# capture high resolution image
draw 2000, 2000
png draw.png


Hope that helps.

Cheers,
  Thomas

On 20 Aug 2014, at 03:56, Diller, Anna, Dr. <ann...@he...> wrote:
> Dear pymol-users,
> 
> the volume representation works splendid for me,
> when I ray an image with the command ray the volume representation stays as indicated on the screen prior to rendering, which is perfect,
> however when I ray an image with the command e.g ray 1000,1000 or ray 2000,2000 the volume representation changes and appears enlarged ?
> 
> Has anybody had the same issue ?
> 
> Thanks a lot for your response!
> 
> With kind regards,
> Anna
> 
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-- 
Thomas Holder
PyMOL Developer
Schrödinger, Inc.