[PD] gemframebuffer and video OR multiple shaders

Ben Baker-Smith bbakersmith at gmail.com
Fri Feb 26 20:06:23 CET 2010

Thanks so much! [translateXYZ 0 0 -4] is just what I needed. I realize
now that last time I needed to use [gemframebuffer] I went through
this same period of confusion.

Can someone update the [gemframebuffer] help patch to explain this anomaly?


On Fri, Feb 26, 2010 at 12:37 PM, cyrille henry <ch at chnry.net> wrote:
> hello,
> 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.
> Cyrille
> 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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