This technique is fairly common in 2d games now. I wrote a blog post on this technique along with a form of ray tracing to also cast shadows in a 2d game: http:

This technique is fairly common in 2d games now. I wrote a blog post on this technique along with a form of ray tracing to also cast shadows in a 2d game: http://mattgreer.org/post/4dynamicLightingShadows http://mattgreer.org/post/4dynamicLightingShadows