gi = global illumination
DESCRIPTION
GI = Global IlluminationTRANSCRIPT
Why GI?
Why GI?
What is GI?
Direct lighting Indirect lighting
What is GI?
Only Direct Lighting Direct + Indirect
What is GI?
ON OFF
What is GI?
What is GI?
● Direct lighting – sucks
● Direct + Indirect lighting – cool
What is GI?
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++
● Brute force – really heavy
GI in 99 Lines of C++
MotoGP
Hemisphere Lightning
Radiosity Map
Hemisphere Lightning
Hemisphere Lighting
● Fast & simple
● Too simple
Hemisphere Lightning
Mirror's Edge
Lightmaps
Lightmaps
● Only static objects
Lightmaps
Killzone 2
Light Probes
Light Probes
Light Probes
Light Probes
● No dynamic lights
● No self-illumination of dynamic objects
Light Probes
Light Propagation Volumes
Light Propagation Volumes
Light Propagation Volumes
Light Propagation Volumes
No propagation
Light Propagation Volumes
After 4 iterations
Light Propagation Volumes
After 6 iterations
Light Propagation Volumes
After 8 iterations
Light Propagation Volumes
Light Propagation Volumes
Light Propagation Volumes
Light Propagation Volumes
● Dynamic lights
● No indirect shadows
Light Propagation Volumes
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
Voxel Cone Tracing
Voxelization
Voxel Cone Tracing
Sparse Quad-tree
Voxel Cone Tracing
Sparse Voxel Octree
Voxel Cone Tracing
Voxel Cone Tracing
Light injection
Voxel Cone Tracing
Filtering up
Voxel Cone Tracing
Voxel Cone Tracing
Voxel Cone Tracing
Voxel Cone Tracing
Voxel Cone Tracing
37 ms 32 ms 14 min
Voxel Cone Tracing
● Dynamic lights & objects
● Shadow casting
● Huge amount of memory
Voxel Cone Tracing
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