Solved, see below posts
I'm very confused.
I have a layer with effects on it (sprites with multiply effect), but I need a way of "masking" where the effects are, either by saying where the effects can be, or a way of subtracting from the effects.
In my capx, I have two layers. One is for objects, the other overlays effects. What I had hoped to do, and what didn't work, was to set the mask to Destination out, which in theory would subtract from the rest of the layer. The problem is it also subtracts from everything else in the layout. I've tried setting 'force own texture', but it of course only works when the layer is not transparent, which is really quite important.
Anyone know how to get around this?
Link to capx