@frazzle:

So, can shadows contour to sprites? If I read your explanation correctly, that green area is just a sprite and the stencil shadow is bending up it? I'll try and reread what you wrote and see if I can better interpret it. Regardless, I'd still like the ability for the shadows to render on invisible surfaces just to have it in the engine for any ol' thing I might want it for (or for others who might think of something cool to do with it).