[Chimera-users] Making an omnimax POVray movie

[Kristina Furse]

> Wow, this movie sounds great!!

Thanks! It started with the fairly innocent idea of making use of the digital
imaging resources here to make something for recruiting that was based on real
research and not canned fly throughs of buckyballs. (Not that a good buckyball
fly through isn't fun...) It has snowballed in complexity as we have discovered
the cool things you can do with Chimera.

>
> Our main POV-Ray expert is not in today, but I can address one part
> of your question.  It looks like postprocessing the *.pov files to
> specify "omnimax" is the way to go.  Maybe it could be combined with
> the x3d2pov step somehow.

OK, good. That was the step we were least sure of.

> Secondly, the POV-Ray documentation
> http://www.povray.org/documentation/view/3.6.1/247/
> says that "omnimax" uses different amounts of fisheye distortion in
> the vertical and horizontal directions,

Yes--from our tests it looks very weird on a computer screen. Severe compression
in the vertical but not the horizontal.

> I would suggest validating your scripts with a smaller image size and
> without raytracing, but it sounds like you have already done that or
> something similar.

We are testing on a single frame to get the perspective -> omnimax conversion
right. Looks like the camera needs to be moved significantly closer to the
object, possibly with a change in viewing angle too. We're still working it
out. We'll also test a frame on the dome before we swing into full production.
Unfortunately, the guru who knows how to spit the image to the 8 projectors is
out with the plague or something...

Thank you!
Kristina

>
> On Feb 26, 2008, at 8:41 AM, Kristina Furse wrote:
>
> > Hi-
> >
> > We're interested in using Chimera to prepare POVray files for a
> > movie to be
> > shown on a hemispherical dome. The first part of the movie will be
> > a 360 degree
> > rotation of a DNA/drug complex showing water occupancy around the
> > drug, and the
> > second half will come from an AMBER MD trajectory. We've figured
> > out the
> > content and rendering. The two remaining issues are that the camera
> > must be
> > changed from "perspective" to "omnimax" (fisheye), and the
> > extensive rendering
> > time that will be required for the large system at very high
> > resolution
> > (4096x4096). Here is our plan:
> >
> > 1. Use a command-line script to rotate the system and export the
> > scene to x3d
> > files.
> > 2. Use per-frame scripting in MD movie to export each trajectory
> > frame to x3d
> > files.
> > 3. Use x3d2pov to translate into *.pov files.
> > 4. Change the camera from perspective to omnimax in each .pov file.
> > 5. Render the individual images in parallel on our cluster using
> > povray
> > (different version than the one that ships with Chimera).
> > 6. Compress to jpeg.
> > 7. Assemble movie as .mov (format compatible with projection system
> > in the
> > dome).
> >
> > Does anyone have a better idea? I'm assuming that I can't change
> > the camera to
> > omnimax from within Chimera?
> >
> > Thanks for any suggestions!
> > Kristina
> >
> > --
> > Kristina Furse
> > Postdoctoral Research Associate
> > 262 Stepan Chemistry Hall
> > Notre Dame, IN 46556
> > (574)631-3904
> >
>


--
Kristina Furse
Postdoctoral Research Associate
262 Stepan Chemistry Hall
Notre Dame, IN 46556
(574)631-3904