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

[Jack]

Have you try with [pix_share_read] and [pix_share_write] ? Then connect
the [pix_share_write] to a [pix_mask] or [pix_multiply].
In all cases, you will need to use [gemframebuffer] to 'mask' certain
processes/parts (the background and transform the particles in texture).
But, i really recommand tu use GLSL in your patch to accelerate things.
In my previous patch, you can add a GLSL 'part' on the gemchain where
there is [gemhead 51] or simply use a [color 1 1 1 0.9] (although it is
not really a biquad ;) on it.
++

Jack



Le lundi 07 juin 2010 à 21:59 +0200, patko 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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