[visionegg] Re: using gratings as textures
- From: Andrew Straw <astraw@xxxxxxxxxxx>
- To: visionegg@xxxxxxxxxxxxx
- Date: Wed, 18 Nov 2009 14:02:58 -0800
bgoll001@xxxxxxxxxxxxxxx wrote:
Hi all,
Is there a way to use moving gratings as if they were textures? I would like
to create the effect of flow either at or away from the viewer, so the grating
bars closer to the viewer should be bigger than the ones farther away. I
thought an easy way to do this might be to apply them to a cylindrical or
spherical map as is done with an image in the demos, but I don't know if a
grating can be used like a texture.
Hi Benny,
I think what you're looking for -- but I'm not 100% sure I understand
your question -- is the SinGrating3D class. It lets you specify the
corners of a quad in full 3D space. You then move the grating on that 3D
quad. Obviously, you have to set up the projection such that it appears
correct to the viewer. I recently got a copy of "Spatial Augmented
Reality" by Bimber and Raskar and I think it goes over all these issues
in good detail. In fact, I'd like to make VE demos outlining these
techniques. In the meantime, see the script
demo/project_linear_grating_on_cylinder.py, which does do some of this.
-Andrew
--
Andrew D. Straw, Ph.D.
California Institute of Technology
http://www.its.caltech.edu/~astraw/
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