Screen-space stippling

I have some editor-only objects that I’d like to draw with partial transparency, so that I can visualize both those objects and the scene geometry. Since partial transparency has severe limitations in UE4’s deferred renderer, I’d like to use screen-space stippling instead, if possible. Is there any support for that in the renderer? I notice the transform widget does something similar, stippling black over depth-failed areas, but that’s not precisely what I’m going for. (Out of curiosity, what controls that, though? The material used by the widget doesn’t seem out-of-the-ordinary, and I don’t notice anything in the rendering code generating screen-space UV coordinates.)

Not sure why this was never answered - sorry. Here you find the answer: