Hi Sean,
Sorry about that. Tried from the top of my head and the evening had
past too far for that already. These vectors define the directions to
distribute the lights - you basically create an area of light sources.
So you need to set two vectors:
area_light <5,0,0>,<0,5,0>,5,5
This will generate 25 lights in a five by five array perpendicular to
the Pymol viewing axis (which is always along z).
Cheers,
Tsjerk
On Thu, May 14, 2009 at 11:21 PM, Sean Law <magic...@hotmail.com> wrote:
> Tsjerk,
>
> Thanks for the quick response. I noticed that after "area_light" there
> should be two axis vectors (according to the povray website) but you've only
> specified one. Should I just repeat the same axis twice?
>
> Sean
>
>
>> Date: Thu, 14 May 2009 22:47:54 +0200
>> Subject: Re: [PyMOL] POVRAY Usage
>> From: tsje...@gmail.com
>> To: magic...@hotmail.com
>> CC: pymol-users@lists.sourceforge.net
>>
>> Hi Sean,
>>
>> Unfortunately, getting a good image through POV-Ray requires editing
>> the POV-Ray file. You can write the scene to disk with the following
>> commands
>>
>> pov=open("protein.pov","w")
>> pov.write(cmd.get_povray()[0])
>> pov.write("#include \"povray.inc\"")
>> pov.close()
>>
>> open("povray.inc","w").write("cmd.get_povray()[1])
>>
>> Then, take your favorite editor (under windows, you can use the
>> POV-Ray editor) and make some changes:
>>
>> 1. There's a line starting with #defaults. Remove that and replace it
>> with:
>>
>> #default {
>> finish {
>> ambient .15
>> diffuse .5
>> specular 1
>> roughness .001
>> reflection { .5 metallic } // Remove this line for less
>> glossyness and faster tracing
>> }
>> }
>>
>> 2. There's a light statement, which says:
>> light_source{<4000.0001,4000.0001,9960.0000> rgb<1.0,1.0,1.0>}.
>> Replace it with:
>>
>> light_source
>> {
>> <20,10,0>
>> rgb 2
>> area_light <5,5,0>,5,5
>> adaptive 1
>> jitter
>> }
>>
>> This usually works for me :)
>>
>> Note that the trace may now take some time. Remove the metallic
>> reflection for faster tracing.
>>
>> I hope it helps. POV-Ray is cool, but rather complicated.
>>
>> Cheers,
>>
>> Tsjerk
>>
>> On Thu, May 14, 2009 at 10:21 PM, Sean Law <magic...@hotmail.com> wrote:
>> >
>> > Hi All,
>> >
>> > While ray tracing a scene with 10 x-large proteins in grid mode at 3600,
>> > 3600 (width, height) I ran out of RAM (2 GB). I tried it again by writing
>> > everything into a script and using pymol -qc which still ran out of memory.
>> > I read somewhere that POVRAY is less of a memory hog so I installed the
>> > latest version and simply modified my script to "ray 3600, 3600,
>> > renderer=1"
>> > to use POVRAY. Everything went smoothly but I noticed that the image
>> > generated from POVRAY looked different than the native ray traced structure
>> > using PyMOL's ray tracer (simply invoking "ray" without dimensions in
>> > PyMOL). Specifically, the light reflections appeared to be dulled in
>> > POVRAY
>> > and spheres that were further away from the camera view are not
>> > distinguishable. I've posted a comparison on the PyMOLWiki:
>> >
>> > http://www.pymolwiki.org/index.php/Povray_vs._pymol
>> >
>> > Firstly, I apologize as I am completely new to the world of POVRAY and I
>> > just assumed that the image produced from either method would give
>> > identical/close results but I much prefer the look of the PyMOL ray-tracer.
>> > Is there an easy way to set everything up the same way as the PyMOL
>> > ray-tracer but for POVRAY? Thank you for your time.
>> >
>> > Sean
>> >
>> > ________________________________
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>>
>>
>>
>> --
>> Tsjerk A. Wassenaar, Ph.D.
>> Junior UD (post-doc)
>> Biomolecular NMR, Bijvoet Center
>> Utrecht University
>> Padualaan 8
>> 3584 CH Utrecht
>> The Netherlands
>> P: +31-30-2539931
>> F: +31-30-2537623
>
> ________________________________
> Internet Explorer 8 makes surfing easier. Get it now!
--
Tsjerk A. Wassenaar, Ph.D.
Junior UD (post-doc)
Biomolecular NMR, Bijvoet Center
Utrecht University
Padualaan 8
3584 CH Utrecht
The Netherlands
P: +31-30-2539931
F: +31-30-2537623
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