[PD] self-similarity

B. Bogart ben at ekran.org
Mon Jun 6 19:34:40 CEST 2005

The effect is actually in texture-land not vector land.

So I copy the buffer pix_snap2tex, and then rotate the copy slightly,
which gets copied in the next frame and so on. Like video feedback.

The idea came from Erich Berger to whom I am very grateful.

The good thing is that you can many iterations even if your graphics
card is not great at repeating Geos. Actually self-similar is a little
fancy because I'm using three copies of the feedback, and using pix_snap
(not snap2tex) because the areas of the texture that only contain the
background colour of the window are transparent. So one feedback surface
can feedback onto a second.

Last time I heard there was some work on the idea of sharing
display-lists in Gem so that multiple instances of the same object could
be a little faster. Any status report on this?


Thoralf Schulze wrote:
> Hi,
>>off topic:
>>ben: i was checking this out
>>and wondered if you might share a very simple
>>example patch on doing
>>self-similar stuff?
> judging from the pictures, I suppose that ben repeated
> geos with slight changes to their rotateXYZ /
> translateXYZ parameters. Something like this:
> http://lists.puredata.info/pipermail/pd-list/2004-09/022550.html
> , only in 3d.
> hope this helps,
> thoralf.
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