[PD] gemframebuffer and video OR multiple shaders

cyrille henry ch at chnry.net
Fri Feb 26 19:37:03 CET 2010


you have to use frambuffer in order to chain multiple shader.
there are example for this in the glsl section of Gem help.

the most common problem with gemframbuffer is that you need to add a translateXYZ 0 0 -4 after the gemhead in order to have the same vision point than without the frambuffer.


Ben Baker-Smith a écrit :
> Hello,
> I'm working on porting Andrew Benson's optical flow glsl shaders over
> to PD. I've got the primary shader working, but need to send the
> output to the second shader. I figured that the best way to deal with
> this would be to use [gemframebuffer] to send the results of my first
> chain (including [pix_video] and the first shader) to a second chain
> to be processed with the second shader.
> My first problem is that I cannot seem to get [gemframebuffer] to work
> with [pix_video] or with [pix_film] for that matter. Is this the
> appropriate tool?
> Alternately, if someone knows how to use multiple shaders in the same
> render chain then I wouldn't have to use [gemframebuffer] at all.
> -Ben
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