Parallel Rendering Algorithm for Single Scattering Based on Photon Map of Virtual Beamlet Lights

In order to accelerate the real-time rendering efficiency with the photon mapping, a virtual beamlet lights based parallel scattering algorithm is presented in this paper.Firstly, photons in medium are obtained by sampling plane, the beamlet is generated according to the sampling photons in the scene, and the width of each point in the beamlet is gained through interpolation between the both ends photon width.Then, the radiation of the view ray is estimated using the beamlet which intersects the view ray.Lastly, the final image is rendered according to the radiation of each view ray.The experimental results show that proposed algorithm can implement many kinds of scattering effects and improve the rendering efficiency for participating media.