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• decouple light integration complexity from light transport complexity;
• model environment light with a set of SRBFs;
• address light integration complexity by precomputation;
• handle self shadowing by convolution optical depth map;
• handle mutiple scattering by dual scattering and sparse sampling and interpolation.

• the first interactive hair rendering algorithm under environment lighting;
• support light animation;
• support dynamic hair volume.

• precomputation per scattering function;
• ignore eccentricity in the scattering function.

downloadable:

• tabulate per-vertex transfer from global incident directions to local incident directions;
• use biclutering to directly compress the transfer matrix.

• all-frequency biscale transfer, support highly-detailed surface under env-lighting;
• high compression ratio with no quality lost;
• operates directly on pixel basis, fully dynamic env-lighting can be directly supported.

• static scene geometry;
• rather costly pre-computation(~1 hour).

downloadable:

• move all stages of basic Reyes pipeline to GPU;
• introduce a dynamic stage scheduling algorithm to maximize the available parallelism at each individual stage of the pipeline while keeping data in GPU memory;
• minimize inter-GPU communication by a multi-GPU scheduling algorithm based on work stealing, which can be easily combined with the stage scheduling algorithm above;
• implemented with BSGP.

• could be the fastest Reyes renderer on PCs;
• support multi-GPU and out-of-core texture;
• quality is comparable with PRMan.

•  system will fail if the grids and their bounding boxes do not fit into the vram;
• currently only support basic Reyes features. no ray tracing, no photon mapping...(coming soon)

downloadable:

• accurately evaluate source radiance and its gradient at a relative small number of  sample points in the volume, and use gradient-based interpolation to approximate the source radiance elsewhere;
• sample the interpolation error in the valid sphere of each sample, and dynamically splitting those with higher estimated error on a hierarchical grid structure.
• use source radiance splatting to construct the source radiance volume, followed by a ray march to  yield the radiance to the view.

• all-frequency lighting effects such as light shaft, volumetric shadows and inhomogeneous glowing;
• editable media property;
• good scalability with regard to volume resolution and number of lights;
• precomputation can be avoided for analytical medium representations.

• single-scattering only (though it's possible to be combined with the technique below to incorporate multiple-scattering);
• constant phase function.

downloadable:

• as a preprocess, decompose density field into an analytical low-freq RBF representation and a residual field which can be compressed by perfect spatial hashing;
• evaluate source radiance at RBF centers, taking into account only the RBF representation;
• use SHEXP to accelerate single scattering computation, and BSGP to accelerate multiple scattering;
• compensate for the residuals in the final ray marching pass.

• fast smoke rendering with single/multiple scattering effects and fine details;
• editable smoke property;
• moderate preprocessing time, less than an hour for a 600-frame animation.

• low-frequency lighting, can't handle strongly directional phase functions;
• can't handle real dynamic medium due to the need for precomputation.

downloadable: