VMD-L Mailing List

From: Nicolas Sapay (nicolas.sapay_at_cermav.cnrs.fr)
Date: Tue Aug 18 2009 - 11:11:35 CDT

Thanks, that exactly what I want to do!

Nicolas

John Stone a écrit :
> Nicolas,
> Yes, you should be able to use the new "outline" material properties
> (and several example materials) to get edge outlines, both in VMD itself,
> and with Tachyon, as described here (make sure to enable the GLSL rendering
> mode to try it in VMD itself):
> http://www.ks.uiuc.edu/Research/vmd/minitutorials/glsloutline/
>
> If this isn't what you had in mind, send me an example image that
> shows me what you're doing and why it's different than the technique
> we've got built-in in VMD 1.8.7 and I'll see if I have an alternative
> suggestion. My hunch is that you'll be able to get what you want by
> tweaking the material properties in VMD.
>
> Cheers,
> John Stone
> vmd_at_ks.uiuc.edu
>
> On Tue, Aug 18, 2009 at 05:54:44PM +0200, Nicolas Sapay wrote:
>
>> Thanks for the quick answer,
>>
>> I send you the files off the list. The problem is that I wanted to use
>> POV-Ray to add an extra effect on the picture, i.e. outlining the shape
>> of the structure by a thin black line. Is it possible to do that with
>> Tachyon or TachyonInternal?
>>
>> Cheers,
>> Nicolas
>>
>> John Stone a écrit :
>>
>>> Nicolas,
>>> Hmm, I hadn't encountered that before, I'll have to look at the
>>> POV-Ray export code. The "nan" looks to me like we've got a degenerate
>>> triangle getting exported, which is definitely undesirable. I would
>>> suggest
>>> that you try rendering the same scene using TachyonInternal, which will
>>> avoid
>>> the file generation step, and thus avoid the problem with the NaN numeric
>>> value
>>> being emitted and then later failing to parse. Try that and let me know if
>>> it works for you. Ultimately, I'll probably have to add a bit of code that
>>> catches this situation. Can you send me a tar.gz file containing the
>>> structure
>>> and VMD saved state that results in the scene that triggers the problem?
>>> If you can send it to me, I should be able to reproduce it here and change
>>> the
>>> code to prevent this from occuring.
>>>
>>> Cheers,
>>> John Stone
>>> vmd_at_ks.uiuc.edu
>>>
>>> On Tue, Aug 18, 2009 at 04:53:10PM +0200, Nicolas SAPAY wrote:
>>>
>>>
>>>> Hello,
>>>>
>>>> I'm trying to render a picture with POV-Ray using a pov file generated by
>>>> VMD. Unfortunately, POV-Ray crashes at the following line:
>>>>
>>>> // MoleculeID: 0 ReprID: 4 Beginning polyhedra
>>>> VMD_triangle(<-0.28497034,0.30557495,2.2290211>,<-0.28497034,0.30557495,2.229021
>>>> 1>,<-0.28497034,0.30557495,2.2290211>,<nan
>>>> Parse Error: Expected 'numeric expression', undeclared identifier 'nan'
>>>> found
>>>> instead
>>>>
>>>> The problem comes from the polyhedra representation used on some part of
>>>> my system. From what I understand about the VMD_triangle macro, it looks
>>>> like a corner of the polyhedra is missing in the pov file. Does someone
>>>> have ever faced this problem?
>>>>
>>>> Cheers,
>>>> Nicolas
>>>>
>>>> --
>>>> [ Nicolas Sapay - Post-Doctoral Fellow ]
>>>> CERMAV - www.cermav.cnrs.fr
>>>> BP53, 38041 Grenoble cedex 9, France
>>>> Phone: +33 (0)4 76 03 76 44/53
>>>>
>>>>
>>>
>>>
>
>
>
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