Is there a well-known way (or perhaps reusable bit of code) for pixel-perfect collision detection in XNA?
I assume this would also use polygons (boxes/triangles/circles) for a first-pass, quick-test for collisions, and if that test indicated a collision, it would then search for a per-pixel collision.
This can be complicated, because we have to account for scale, rotation, and transparency.
EditWARNING: I'm sure there's an elegant hack solution to this. XNA is effectively 3DIf you're using the sample code from the link from the answer below, so something as simple as "cast a line through this position atbe aware that (x, y) and see ifthe scaling of the matrix is commented out for good reason. You don't need to uncomment it intersects both sprites." That's the kind of direction of solution I'm looking towardsout to get scaling to work.