Voxel-based global illumination
I3D '11 Symposium on Interactive 3D Graphics and Games
Real-time diffuse global illumination using radiance hints
Proceedings of the ACM SIGGRAPH Symposium on High Performance Graphics
Interactive rendering of acquired materials on dynamic geometry using bandwidth prediction
I3D '12 Proceedings of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games
Global illumination with radiance regression functions
ACM Transactions on Graphics (TOG) - SIGGRAPH 2013 Conference Proceedings
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Global illumination provides a visual richness not achievable with the direct illumination models used by most interactive applications. To generate global effects, numerous approximations attempt to reduce global illumination costs to levels feasible in interactive contexts. One such approximation, reflective shadow maps, samples a shadow map to identify secondary light sources whose contributions are splatted into eye space. This splatting introduces significant overdraw that is usually reduced by artificially shrinking each splat's radius of influence. This paper introduces a new multiresolution approach for interactively splatting indirect illumination. Instead of reducing GPU fill rate by reducing splat size, we reduce fill rate by rendering splats into a multiresolution buffer. This takes advantage of the low-frequency nature of diffuse and glossy indirect lighting, allowing rendering of indirect contributions at low resolution where lighting changes slowly and at high-resolution near discontinuities. Because this multiresolution rendering occurs on a per-splat basis, we can significantly reduce fill rate without arbitrarily clipping splat contributions below a given threshold—those regions simply are rendered at a coarse resolution.