hello, i suggest doing the feedback in a black FB, and then applying this texture thanks to a custom shader in order to program the blending function you need.
cheers c Le 28/08/2017 à 00:56, andre rc a écrit :
Thank you for the patch Cyrille. It's a very nice solution. The only disadvantage is that it makes the background image feedback dependent. My goal is to isolate the feedback from other geos & image/videos. So, I was thinking that in order to keep the blur I have to keep the gemframebuffer RGB format and add transparency after it. I just realized that [alpha] has several blending functions, some of them turn the whole framebuffer transparent. This is fine but now the geo and blur are also affected (see attached). I don't know if it is possible to add other type of blending after the framebuffer, maybe sending it to another gemframebuffer and changing the background color (black) to alpha? I saw that pix_alpha achieve this but I don't know how to use it only with the framebuffer image. Any suggestion is welcomed :) regards, andre On 27 August 2017 at 11:48, cyrille henry <[email protected] <mailto:[email protected]>> wrote: hello Le 27/08/2017 à 03:05, andre rc a écrit : Hello, I'm trying to apply motion blur only to one geo with gemframebuffer. It works fine until I add a background image: when I switch the gemframebuffer format from RGB to RGBA the amount of motion blur decrease considerably. yes, since the feedback image became more and more transparent... Is there a way to get the same amount of motion blur (long tail) with alpha on? replace [color 1 1 1 0.95] with [color 0.95 0.95 0.95 1] but that's not what you want since it will fade to black and not to transparent. an other solution would be : you can alter the color of the feedback image by drawing a bit of the BG on top of it. attachment example. cheers c Attached example. thanks & regards, andre _______________________________________________ [email protected] <mailto:[email protected]> mailing list UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list <https://lists.puredata.info/listinfo/pd-list> _______________________________________________ [email protected] <mailto:[email protected]> mailing list UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list <https://lists.puredata.info/listinfo/pd-list>
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