effects not distort mapped

if you use a distort map, the effect is still drawn in the original shape of the sprite

for instance,

this means you can't use any effect on a distorted sprite unless you just use it as a layer effect

which won't work most of the time if you have objects passing over one another

True some things wont go past the bounding box. You could always extend the perimeter, but you would have to change the distort map to compensate.