An improved algorithm of radiance estimate in photon mapping

The photon map method is an important method to efficiently compute global illumination in Ray Tracing.But the radiance estimate which used in Photon mapping to compute the radiance is time-consuming.A new method is presented which uses weighted average to accelerate the speed of radiance estimate.The tests indicate that the radiance estimate,which is the most time-consuming part,used in photon mapping can be sped up by 3 to 5 times in typical scene.