VMD-L Mailing List

From: Vlad Cojocaru (vlad.cojocaru_at_mpi-muenster.mpg.de)
Date: Tue May 04 2021 - 18:09:52 CDT

Thanks John for the explanation ....

Best,
Vlad

On 03/05/2021 23:10, John Stone wrote:
> Hi,
> When working with one of the well supported ray tracing engines,
> it should not be necessary to have the VMD graphical representation
> triangle mesh tessellation resolution set very high. In most cases,
> the default resolution setting will be sufficient for good quality
> renderings. This is in part due to the fact that the ray tracing
> engines do pixel-rate lighting calculations, with interpolated
> surface normals, so increasing the density of triangulation only
> helps rendering of geometry with very tight curvature. As you've
> described, setting these values too high can be counterproductive,
> if taken too far. It is especially costly to rendering performance.
> I should note that unless you have a specific reason not to, you'll
> get generally better performance by using the "TachyonInternal"
> renderer that also works entirely from memory, and avoids the time
> required to write the scene to disk and then parse it for rendering.
>
> Best,
> John Stone
> vmd_at_ks.uiuc.edu
>
> On Sun, May 02, 2021 at 11:55:07PM +0200, Vlad Cojocaru wrote:
>> It actually worked by lowering the resolution of the representations ....
>> Reducing it from 30 to 15 for all reps lead to a 10 fold decrease in the
>> size of the scene file and the rendering was successful. The lower rep
>> resolution does not affect that much the image.
>>
>> Best,
>> Vlad
>>
>> On 2 May 2021 20:10:50 CEST, Vlad Cojocaru
>> <vlad.cojocaru_at_mpi-muenster.mpg.de> wrote:
>>
>> Dear all,
>>
>> I am trying to render a very complicated scene in VMD (1.9.4a51) with
>> shadows and ambient occlusion on. The scene contains many simulation
>> frames superimposed with a number of high resolution representations ...
>> Tachyon creates a scene description file that is 25 GB large but it
>> fails to produce the targa file although it says "rendering complete"
>> and no error message is given. With povray, the ".pov" file is huge (56
>> GB) and the targa image is also not produced.
>>
>> Can anyone give me any advice on how to best render such a complicated
>> scene into a high resolution image ?
>>
>> Thanks
>>
>> Best wishes
>> Vlad
>>
>> --
>> Sent from my Android device with K-9 Mail. Please excuse my brevity. 

-- 
Vlad Cojocaru, PD (Habil.), Ph.D.
-----------------------------------------------
Project Group Leader
Department of Cell and Developmental Biology
Max Planck Institute for Molecular Biomedicine
Röntgenstrasse 20, 48149 Münster, Germany
-----------------------------------------------
Tel: +49-251-70365-324; Fax: +49-251-70365-399
Email: vlad.cojocaru[at]mpi-muenster.mpg.de
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