[PD] Alpha+pix_film

marius schebella marius.schebella at gmail.com
Sun Jan 25 00:43:19 CET 2009

info at thesaddj.com wrote:
> Hi all,
> here is Marco, this is my first post.. glad to be here.
> i'm trying to use the [alpha] object to mix different videos
> using OpenGL.  I followed tutorials, checked the forum and
> the list but i still have this problem:
> I can change the transparency of a geo without texture, and
> everything works also when i load images. But when i add
> [pix_film] or [pix_movie] and i load a video the geo itself
> disappears - if alpha is on - and appears again (displaying
> correctly the video) when alpha is off. 
> I also tried to change [pix_texture] with [pix_texture2] and
> [rectangle] with other geos, but nothing...
>  I think this is pretty strange.
> this is my basic patch not working:
> [gemhead]
> |
> [pix_film]X[t f]
> |
> [pix_texture]
> |
> [alpha]
> |
> [colorRGB]
> |
> [square]

That should work. even if the order is a little strange, because I would 
put the alpha and color before the pix_texture, but it is working here 
and I also have an ATI Radeon X1600 (MacOS).
what do you mean with "turn alpha on/off"? are you setting the alpha by 
sending a value between 0 and 1 to the rightmost inlet of colorRGB?
are there additional things in your patch which could cause the problem?

> Cannot understand if it could be a problem of my graphic
> card - ATI Mobility Radeon X1600 - or something else.
> I work - unfortunately - on windows xp pro, with pd-extended
> latest stable release.
> i didn't have the chance to try the same on another
> computer, by now.
> Thanks a lot to everybody..
> cheers...
> Marco
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