atom feed14 messages in at.iem.pd-listRe: [PD] GEM - alpha blending of imag...
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Item StateFeb 16, 2007 9:44 am.pd, .pd
Item StateFeb 16, 2007 10:29 am.pd
Oli44Feb 16, 2007 10:47 am 
chris clepperFeb 16, 2007 10:51 am 
cyrille henryFeb 16, 2007 11:12 am 
Item StateFeb 16, 2007 11:18 am.pd
Kyle KlipowiczFeb 16, 2007 11:22 am 
Item StateFeb 16, 2007 11:32 am 
Item StateFeb 16, 2007 11:49 am 
cyrille henryFeb 16, 2007 12:03 pm 
Roman HaefeliFeb 16, 2007 12:52 pm 
Item StateFeb 16, 2007 1:10 pm 
Roman HaefeliFeb 16, 2007 1:33 pm 
chris clepperFeb 16, 2007 1:38 pm 
Subject:Re: [PD] GEM - alpha blending of images over movies
From:Roman Haefeli (redu@yahoo.de)
Date:Feb 16, 2007 1:33:01 pm
List:at.iem.pd-list

On Sat, 2007-02-17 at 08:10 +1100, Item State wrote:

ok, thanks for clarification.

but what about pix_movie, it seems to be in another domain than pix_image because i cannot apply the processes to it that i can apply to pix_image.

this is because [pix_movie] has [pix_texture] already 'built-in'. the equivalent to [pix_image] would be [pix_film], which requires an extra [pix_texture] to be textured onto a 3d-object.

also pix_image "needs" either pix_draw or pix_texture -> pix_rectangle,

yes (though i think you mean [rectangle] here instead of [pix_rectangle], which does something different).

while pix_movie goes directly into pix_rectangle without an intermitting pix_texture, and

yes (also here i assume you mean [rectangle])

it cannot be plugged into pix_draw ...?

exactly, because [pix_draw] wants a pix, not a texture.

roman

ciao, -sciss-

--- Roman Haefeli <redu@yahoo.de> wrote:

On Sat, 2007-02-17 at 06:32 +1100, Item State wrote:

unfortunately i have the same problem with your patch (psychedelic colours). the [colorRGB] is pretty cool, it does exactly what i want, but this only works here with [pix_texture] but have no effect when using [pix_draw] instead...

i hope i can clarify this a bit in my own (maybe not too correct) words. there are actually two different domains in Gem: opengl and 'pix'es. all opengl-based stuff is renderend on the gpu (graphic card's cpu), whereas all pixel-based objects are calculated on the cpu. playing and processing videos and pictures happens in the pix-domain (afaik, all pix_*-objects work in that domain). pix_texture is used to convert an image (from a picture or a video) to a texture, that can be applied to a vertex . that means the picture is then in the opengl-domain and cannot be processed with pix_*-objects anymore. so there are actually two (or more?) ways of alpha-blending a picture: 1) do everything in the pix-domain and use [pix_alpha] (i'm not quite sure anymore about that) 2) give it to the opengl-domain using [pix_texture] and use the fourth (alpha-channel-)inlet of [colorRGB]. the latter approach has the advantage, that everything is rendered on gpu, which saves you a lot of cpu-power. whenever you can, i would do stuff in the opengl-domain (unless you don't have any 3d-acceleration enabled).

i hope i didn't tell you something completely wrong (please someone correct me, if i did)

roman

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