GI = Global Illumination

gamedev, lightning, 3D, light, voxel, animation

Transcript

2. Why GI?
3. Why GI?
4. What is GI? Direct lighting Indirect lighting What is GI?
5. Only Direct Lighting Direct + Indirect What is GI?
6. ON OFF What is GI?
7. What is GI? • Direct lighting – sucks • Direct + Indirect lighting – cool What is GI?
8. 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 GI in 99 Lines of C++
9. • Brute force – really heavy GI in 99 Lines of C++
10. MotoGP Hemisphere Lightning
11. Radiosity Map Hemisphere Lightning
12. Hemisphere Lighting • Fast & simple • Too simple Hemisphere Lightning
13. Mirror's Edge Lightmaps
14. Lightmaps
15. • Only static objects Lightmaps
16. Killzone 2 Light Probes
17. Light Probes
18. Light Probes
19. Light Probes
20. • No dynamic lights • No self-illumination of dynamic objects Light Probes
21. Light Propagation Volumes
22. Light Propagation Volumes
23. Light Propagation Volumes
24. Light Propagation Volumes
25. No propagation Light Propagation Volumes
26. After 4 iterations Light Propagation Volumes
27. After 6 iterations Light Propagation Volumes
28. After 8 iterations Light Propagation Volumes
29. Light Propagation Volumes
30. Light Propagation Volumes
31. Light Propagation Volumes • Dynamic lights • No indirect shadows Light Propagation Volumes
32. Algorithm • Voxelize the geometry • Construct sparse voxel octree (SVO) • Inject direct lighting into the octree • Propagate radiance • Gather radiance by cone tracing Voxel Cone Tracing
33. Voxel Cone Tracing
34. Voxelization Voxel Cone Tracing
35. Sparse Quad-tree Voxel Cone Tracing
36. Sparse Voxel Octree Voxel Cone Tracing
37. Voxel Cone Tracing
38. Light injection Voxel Cone Tracing
39. Filtering up Voxel Cone Tracing
40. Voxel Cone Tracing Voxel Cone Tracing
41. Voxel Cone Tracing
42. Voxel Cone Tracing
43. 37 ms 32 ms 14 min Voxel Cone Tracing
44. • Dynamic lights & objects • Shadow casting • Huge amount of memory Voxel Cone Tracing
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