I am trying to make a shadow layer below all objects on my board (top down game), and above the floor of course.
I could use transparent pngs, but that has the problem that if two shadows overlap, they darken one another. I need the shadows to combine together, to form a single shadow.
I had the thought to make shadow pngs which are 100% opaque at the middle, and transparent toward the edges, and then apply a transparency to the entire layer of shadow sprites, but so far this does not have the desired effect.
If I put them all as children of a parent sprite, only the parent sprite's transparency changes. Secondly, I want the combined transparency to change, not the transparency of each child. Does this make sense?
