Improved Area Lighting in WebGL & ThreeJS

Question

I have been working on an area lighting implementation in WebGL similar to this demo:

http://threejs.org/examples/webgldeferred_arealights.html

The above imp

Answer 1

http://s3.hostingkartinok.com/uploads/images/2013/06/9bc396b71e64b635ea97725be8719e79.png

If I understand correctly:

define L "Light for point x0"

L ~ K/S^2

S = sqrt(y^2+x0^2)

L = sum(k/(sqrt(y^2+x0^2))^2), y=0..infinity

L = sum(k/(y^2+x0^2)), y=0..infinity, x > 0, y > 0

L = integral(k/(y^2+x0^2)), y=0..infinity = k*Pi/(2*x0)

http://s5.hostingkartinok.com/uploads/images/2013/06/6dbb7b6d3babc092d3daf18bb3c6e6d5.png

Answer:

L = k*Pi/(2*x0)

k depends on the environment