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