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Gi = global illumination
 

Gi = global illumination

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GI = Global Illumination

GI = Global Illumination

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    Gi = global illumination Gi = global illumination Presentation Transcript

    • Why GI?
    • Why GI?
    • What is GI? Direct lighting Indirect lighting What is GI?
    • What is GI? Only Direct Lighting Direct + Indirect
    • What is GI? ON OFF
    • What is GI? ● Direct lighting – sucks ● Direct + Indirect lighting – cool What is GI?
    • 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
    • GI in 99 Lines of C++ ● Brute force – really heavy
    • Hemisphere Lightning MotoGP
    • Hemisphere Lightning Radiosity Map
    • Hemisphere Lightning ● Fast & simple ● Too simple Hemisphere Lighting
    • Lightmaps Mirror's Edge
    • Lightmaps
    • Lightmaps ● Only static objects
    • Light Probes Killzone 2
    • Light Probes
    • Light Probes
    • Light Probes
    • Light Probes ● No dynamic lights ● No self-illumination of dynamic objects
    • Light Propagation Volumes
    • 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 ● Dynamic lights ● No indirect shadows Light Propagation Volumes
    • 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
    • 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
    • Check out more knowledge sharing here: Slideshare - https://www.slideshare.net/Sperasoft/ SpeakerDeck - https://speakerdeck.com/sperasoft GitHub - http://github.com/sperasoft Learn more about Sperasoft: Company site - http://www.sperasoft.com/ On Facebook - https://facebook.com/sperasoft On Twitter - http://twitter.com/sperasoft