Gi = global illumination
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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
- 2. Why GI?
- 3. Why GI?
- 4. What is GI? Direct lighting Indirect lighting What is GI?
- 5. What is GI? Only Direct Lighting Direct + Indirect
- 7. What is GI? ● Direct lighting – sucks ● Direct + Indirect lighting – cool What is GI?
- 8. GI in 99 Lines 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 99 Lines of C++ ● Brute force – really heavy
- 12. Hemisphere Lightning ● Fast & simple ● Too simple Hemisphere Lighting
- 14. Lightmaps
- 17. Light Probes
- 18. Light Probes
- 19. Light Probes
- 20. Light Probes ● No dynamic lights ● No self-illumination of dynamic objects
- 25. Light Propagation Volumes No propagation
- 26. Light Propagation Volumes After 4 iterations
- 27. Light Propagation Volumes After 6 iterations
- 28. Light Propagation Volumes After 8 iterations
- 31. Light Propagation Volumes ● Dynamic lights ● No indirect shadows Light Propagation Volumes
- 32. Voxel Cone Tracing Algorithm ● Voxelize the geometry ● Construct sparse voxel octree (SVO) ● Inject direct lighting into the octree ● Propagate radiance ● Gather radiance by cone tracing
- 35. Voxel Cone Tracing Sparse Quad-tree
- 36. Voxel Cone Tracing Sparse Voxel Octree
- 38. Voxel Cone Tracing Light injection
- 39. Voxel Cone Tracing Filtering up
- 40. Voxel Cone Tracing Voxel Cone Tracing
- 43. Voxel Cone Tracing 37 ms 32 ms 14 min
- 44. Voxel Cone Tracing ● Dynamic lights & objects ● Shadow casting ● Huge amount of memory
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