Since the release of VDMX6 I seem to have problems with blending layers with alpha channels.
Simplefied situation with 2 layers:
Layer 1 has a logo with an alpha channel (to make the problem extra visible, set the with and height of this layer to 0.5) Composition mode set to SourceAtop.metal
Layer 2 has a custom full screen visual. Composition mode set to Addition.metal
When changing the opacity of layer 2, the problem arises. The alpha channel of layer 1 becomes visible in the output.
The only solution i have currently found is putting a third solid black layer on the bottom. But this only works in simple setups.
In more complex setups, this problem also occurs inside of grouped layers for which I want to retain (partial) transparency, so a solid black bottom layer in said group would not work.
Related to this problem i have also found that changing the contrast of a layer with transparency changes the 100% transparent background of that layers. This makes it hard to color correct some transparent content. I have not found a solution for this.
attached you can find two example .vdmx files
VDMX transparency bug.zip (641.5 KB)