Real Time Rendering of Dynamic Heterogeneous Translucent Materials

Most of the existing rendering algorithms for translucent materials are designed only for homogeneous materials. Although some algorithms can be used to render heterogeneous materials,they are not efficient enough. This paper provides a real time GPU-accelerated rendering algorithm for heterogeneous translucent dynamic objects. By the method,the mesh vertices are organized first into an octree hierarchy to better explore the parallelism of hierarchy construction by traversing in the graphics hardware,with the bidirectional subsurface scattering reflectance distributed functions (BSSRDF) bound as a per-vertex property. Second,to evaluate the integration over the object surface efficiently,a novel sampling method is also proposed based on the distance between tree nodes and the material similarity. This algorithm can be easily extended to render animated scenes and dynamic materials because no precomputation is needed,and it is flexible for various BSSRDF representations. Experimental results demonstrated that the proposed algorithm achieves real time frame rates and good visual effects.