[PD] PD GEM Alpha for Two Videos
Max Neupert
abonnements at revolwear.com
Sat Feb 25 05:13:48 CET 2006
just a guess:
try changing the order of alpha and colorRGB
Am 25.02.2006 um 04:18 schrieb Mike Pascarella:
> Hi all,
>
> I'm new to the list, but have been using Pd for a while. Recently,
> I have been trying to use GEM to control the opacity of two
> videos. I have found some threads in the archive discussing how to
> set it up, but have run into a strange problem. If I have only one
> video active, I can change its opacity. Once I introduce the
> second video, I lose the ability to change either video's opacity
> (actually, they both become 100% opaque). Here's how I set it up:
>
> Video 1:
>
> gemhead 50
> colorRGB (using a slider to adjust the fourth alpha channel)
> alpha
> pix_film
> pix_texture
> rectangle
>
> Video 2:
>
> gemhead 51
> colorRGB (using a slider to adjust the fourth alpha channel)
> alpha
> pix_film
> pix_texture
> rectangle
>
> I do have a work-around, but I'm baffled as to why it works
> (obviously, I need to learn more). If I add the following to my pd
> document, I can then control the opacity of both videos:
>
> gemhead 50
> square (or any shape)
>
> Since I don't want the new object to be visible, I changed it to
> the following:
>
> gemhead 50
> colorRGB 1 1 1 0
> alpha
> square
>
> It works, but I don't know why. Can anyone shed some light on
> what's going on here? I'm using Miller's OSX compile 0.39-2 and
> the latest compiled version of GEM (G4 version). System is a 1Ghz
> Ti-Book with 768 Mb RAM running OSX 10.4.3. Thanks.
>
> Mike
>
>
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