UE4 : baking light through dithering opacity

Waz0

Hi everyone, i'm working on a scene with big dusty windows, with dithered opacity. The problem is that the baked lights passing through the windows are sharp and not smooth as the opacity map.
Are dithered opacity maps not good for light baking, or am I doing something wrong ?

Thank you

Quack!

Without testing this my guess is that the shadows are going to be based off an arbitrary clamped value in your opacity map.

I would suggest pulling out 1 window and place in a blank room and 1 light and see what shape it creates.

Dithered opacity is still 1 bit alpha, so I would assumed you won't get diffused lighting.