Hi Max,

Thanks for your reply. I tried your suggestion, but changing the
order did not change the behavior.

Mike

On Feb 24, 2006, at 11:13 PM, Max Neupert wrote:

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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