VMD-L Mailing List

From: Kyle Mills (kyle.mills_at_uoit.net)
Date: Mon Apr 04 2016 - 16:37:55 CDT

This is perfect. Thank you very much!
On Mar 31, 2016 11:19, "John Stone" <johns_at_ks.uiuc.edu> wrote:

> Hi,
> Depth of field is sampled when antialiasing samples are taken, so
> the way to achieve a smoother depth of field bokeh effect when doing
> batch ray tracing for movie rendering is to crank up the antialiasing
> samples significantly, e.g.:
> render aasamples TachyonLOptiXInternal 256
> render aasamples TachyonInternal 256
>
> You can similarly get higher quality AO lighting by cranking up the AO
> samples, but Tachyon and TachyonL-OptiX both use a scheme where AO samples
> are taken during shading of every ray-object first-hit intersection, so
> the AA sample count and AO sample count are effectively multiplicative.
> By default, VMD tells Tachyon and TachyonL-OptiX to use 12 AA samples
> per pixel, and 12 AO lighting samples per-hit. So that should help you
> determine what settings you prefer when rendering your movies.
>
> I should also warn you that if you're using the TachyonL-OptiX GPU ray
> tracer
> to render high resolution movies with very large sample counts, you may
> want
> ensure that your NVIDIA driver configuration has the "interactive" flag
> set to "false" so that long running GPU ray tracing kernels (over 2
> seconds)
> don't trigger the X-Windows server's application termination scheme,
> here's a snippet from xorg.conf as an example:
>
> Section "Device"
> Identifier "Device0"
> Driver "nvidia"
> VendorName "NVIDIA Corporation"
> BusID "PCI:2:0:0"
> .... you get the idea...
>
> # prevent OptiX timeouts
> Option "Interactive" "false"
> EndSection
>
> Let me know if you have further questions.
>
> Cheers,
> John Stone
> vmd_at_ks.uiuc.edu
>
>
> On Thu, Mar 31, 2016 at 08:27:50AM -0400, Kyle Mills wrote:
> > Hello,
> > I'm trying to use depth-of-field (DOF) in TachyonOptiX renders using
> the
> > movie maker, and I can't figure out how to modify the number of DOF
> > samples to get a smooth image.A The default blur is rather grainy,
> and
> > I'd like to increase the DOF samples...say with a command like
> > render dofsamplesA TachyonLOptiXInternal 30
> > Thank-you for the help,
> > Kyle
>
> --
> NIH Center for Macromolecular Modeling and Bioinformatics
> Beckman Institute for Advanced Science and Technology
> University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
> http://www.ks.uiuc.edu/~johns/ Phone: 217-244-3349
> http://www.ks.uiuc.edu/Research/vmd/
>