Le 06/10/2013 22:13, Py Fave a écrit :
Hello , i just opened your last patch and am looking at it . weanwhile i reply to your points
2013/10/6 Jack jack@rybn.org:
Hello,
Le 05/10/2013 22:51, Py Fave a écrit :
in fact my problem is not solved . it seems like the feedback effect happens everywhere but on the surface drawn by the shader .
According to the patch, the feedback is applied on a [square 4] (where there is also the [torus 2]). Then, [gemframebuffer] 'snap' the whole 'inside' [square 4]. And your torus is inside this snapshot (as texels and not vertices).
yes ,and then there is some feedback on the texels of the square . but in my patch if i rotate the torus i get some feedback but not on the shaded part (only the silhouette of the torus . i don't know why . i would like everything to go in the feedback loop .
in fact i try to have trails that show "geodesics" on a surface later i plan to replace my torus with other models .
i use a torus , in perspective wich has a shader applied .
i tried the following workaround(archive is joined ) , but still no luck . the file to open has a OPEN in name .
It seems there is no circle4.geom, [receive13] and [nshader0] objects/abstractions in your .zip.
sorry i forgot .
receive13 only is missing . it's part of ext13 library (and is in pd-extended iirc) http://puredata.info/downloads/ext13
[receive13 nothing ]could be replaced by receive nShader1 or all the shader abstraction can be replaced by the classical shader network with fragment shader = circle4.frag and vertex shader = circle4.vert. no .geom was used
i would like the dots to have the feedback , or dots + geometry alltogether.
I can't see dot in your patch (or gem window), maybe they come from geometry shader (which is missing) ?
i didn't use geometry shader . just fragment . glsl program complains in the abstraction but no harm here i think
i tried pix_snap2tex ( using gems.feedback from pdmtl abstractions) too but no luck because we can't choose the mixing function . and i would like only white to make trails . and i don't know how to keep the supporting geometry from appearing . the torus should be full black with a white trail only .
A simple possibility is to use 2 torus, a black 'on' a white. And use the white for the trail ?
An other way :
white torus as texture |__> in the feedback __> output feedback as texture |__> convert white in black texel __> output black torus as texture
Then mix (multiply) black torus with white feedback to get a black torus with white trails. ++
Jack
i'll send a modified patch a bit later .
Thank you so much i see some good things from the last patch you sent .
it is not what i want to do but opens other directions and perhaps i was focusing on one method but there seems to be alternatives .
i'll update this thread tomorrow . i have to keep some life away from computer :-)
Thanks for your help
Py
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Hello Pierre-Yves,
This patch should work for your purpose. If it doesn't work, you have, maybe, a problem with your configuration. ++
Jack