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Gi = global illumination
This document discusses different techniques for rendering global illumination (GI) in 3D scenes. It covers direct lighting, hemisphere lighting, lightmaps, light probes, light propagation volumes, and voxel cone tracing. Voxel cone tracing allows for dynamic lights and objects, indirect shadows, but requires a huge amount of memory. It renders indirect lighting in 37 ms for a scene.
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Gi = global illumination
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- 4. What is GI? Directlighting Indirect lighting What is GI?
- 5. What is GI? OnlyDirect Lighting Direct + Indirect
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- 7. What is GI? ● Directlighting – sucks ● Direct + Indirect lighting – cool What is GI?
- 8. GI in 99Lines of C++ 8 spp 13 sec 200 spp 5 min 1000 spp 25 min 25k spp 10.3 h 2.4 GHz Intel Core 2 Quad, 1024 x 768, by Kevin Beason
- 9. GI in 99Lines of C++ ● Brute force – really heavy
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- 12. Hemisphere Lightning ● Fast &simple ● Too simple Hemisphere Lighting
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- 20. Light Probes ● No dynamiclights ● No self-illumination of dynamic objects
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- 25. Light Propagation Volumes Nopropagation
- 26. Light Propagation Volumes After4 iterations
- 27. Light Propagation Volumes After6 iterations
- 28. Light Propagation Volumes After8 iterations
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- 31. Light Propagation Volumes ● Dynamiclights ● No indirect shadows Light Propagation Volumes
- 32. Voxel Cone Tracing Algorithm ● Voxelizethe geometry ● Construct sparse voxel octree (SVO) ● Inject direct lighting into the octree ● Propagate radiance ● Gather radiance by cone tracing
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- 35. Voxel Cone Tracing SparseQuad-tree
- 36. Voxel Cone Tracing SparseVoxel Octree
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- 38. Voxel Cone Tracing Lightinjection
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- 40. Voxel Cone Tracing VoxelCone Tracing
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- 43. Voxel Cone Tracing 37ms 32 ms 14 min
- 44. Voxel Cone Tracing ● Dynamiclights & objects ● Shadow casting ● Huge amount of memory
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