[PD] [Gem][pix_threshold] (it's about [pix_alpha] in fact)

[Jack]

Le mardi 08 juin 2010 à 01:32 +0200, patko a écrit :
> Yo, I've got it, the background image had to be rendering between a snap and the snapped image,
> so using a trigger resolved this.
> 
>  Inside the patch there is also something I don't understand it's explained inside,
> 
> just putting:
> 
> [gemhead]
> |
> [colorRGB 0 0 1]
> 
> turns background to blue
> 
> Also I'm very interested by the shader method because it's cpu wise
> but I don't know enough the glsl functions for getting the same
> fading effect we have by using [biquad]
Yep !
At the beginning, i really didn't know why you used [pix_alpha], now i
understand, nice effect on the edge ! ;)
++

Jack


> 
> ----- "patko" <colet.patrice at free.fr> a écrit :
> 
> > but I still can't see the background image,
> > 
> > once I could see it but I couldn't get how I did it.
> > +++++
> > 
> > Patrice Colet - 06 32 66 03 57 
> > 
> > ----- "Jack" <jack at rybn.org> a écrit :
> > 
> > > OK, good ! ;)
> > > ++
> > > 
> > > Jack
> > > 
> > > 
> > > 
> > > Le lundi 07 juin 2010 à 21:10 +0200, patko a écrit :
> > > > the rendering order wasn't good in my patch, now you can see the
> > > fading
> > > > 
> > > > Patrice Colet - 06 32 66 03 57 
> > > > 
> > > > ----- "patko" <colet.patrice at free.fr> a écrit :
> > > > 
> > > > > yes, that's what I'm trying to achieve, it just misses the
> > pretty
> > > > > fading we can obtain
> > > > > with biquad processing, but that is exactly that,
> > > > > 
> > > > > thanks
> > > > > ++++
> > > > > Patrice Colet - 06 32 66 03 57
> > > > > 
> > > > > ----- "Jack" <jack at rybn.org> a écrit :
> > > > > 
> > > > > > Here a patch using GLSL and the frame buffer for feedback.
> > > > > > Hope it helps.
> > > > > > ++
> > > > > >
> > > > > > Jack
> > > > > >
> > > > > >
> > > > > >
> > > > > > Le lundi 07 juin 2010 à 17:00 +0200, patko a écrit :
> > > > > > > oupse I've mixed [pix_threshold] and [pix_alpha]
> > > > > > >
> > > > > > > it's about pix_alpha rather but I think you've understood,
> > > > > > >
> > > > > > > indeed I'd like the particle reveals background image
> > > > > > >
> > > > > > > the idea is about snaping the particle system over a black
> > > > > rectangle
> > > > > > (the mask)
> > > > > > >
> > > > > > > and then turning the white pixels to alpha for revelating
> > the
> > > > > > (purple) rectangle
> > > > > > > that should be rendered first
> > > > > > >
> > > > > > > i've attached again the same patch but with [gemhead 5]
> > > instead of
> > > > > > [gemhead 0]
> > > > > > >
> > > > > > > +++
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > ----- "Jack" <jack at rybn.org> a écrit :
> > > > > > >
> > > > > > > > order rendering' because [gemwin 0] <=> [gemwin 50].
> > > > > > > > If I understand, you want to see a background image when
> > > the
> > > > > > > > particles
> > > > > > > > are drawn ?
> > > > > > > > ++
> > > > > > > >
> > > > > > > > Jack
> > > > > > >
> > > > > > >
> > > > > 
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