yeah, OpacityComponent does not cut it. Would be nice to have more controls over the pixels for nice transitions between 3d content and video content.

you need to apply a videomaterial via swift to your entity https://developer.apple.com/documentation/realitykit/videomaterial

i would be interested too, to modify the videomaterial, in my case, i'd like to manipulate the alpha channel with a texture. it would be cool of we could change the unlying unlit shader of the videomaterial with shadergraph in reality composer pro.