Fisheye projection matrix in Xna/OpenGL - 3D

Question

I'm looking for a projection matrix I can use in 3D that will give me the effect of a fisheye. I'm not looking for a pixelshader or anything like that, that will manipulate pixels - but the actual projection matrix used in projecting from 3D space onto 2D.

Thanks.

Answer 1

That's not really possible. In homogeneous coordinates, matrices transform lines to lines. So any solution based solely on matrices will necessarily fail to bend lines like you want to.

Answer 2

Carlos isn't wrong but you might want to try playing with the "field of view (FOV)" parameter in your projection matrix builder.