Hey everyone, I’m having some doubts regarding how touchdesigner handles alpha in video files. I have a quicktime footage rendered with animation codec with alpha. When I load it into TD, it shows up like this:
No big deal, I just go to the Image tab in the operator’s properties and set it to mutiply color by alpha, which gives me:
Great, problem solved, until I decide to build a feedback loop with the video:
The only way I could solve this was adding a glsl top right after the movie file in, and have it multiplying the color by the alpha, again!
That pretty much solves the issue, but not really. As you can see, the footage keeps a weird white outline at the edge of the alpha. Also, it only works with both the “multiply color by alpha” option set to on and the glsl multiplication. If I remove any of them, the white background shows up again.
For referece, this is how it looks in after effects if I go for the same effect, stacking a bunch of layers and resizing them to simulate the feedback I built in TD. As you can see, the alpha is clear, with no white outline.
Any thoughts or ideas on why it works like that, and if there’s any workaround?
Thanks!
