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8 memory management strategies
by Dr. Loganathan R
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![BSDF = BRDF + BTDF…
[Ritschel11]
Games’ Global Illumination (GI)?
Open Problems in Real-Time Rendering – SIGGRAPH 2017](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-7-2048.jpg?cb=1665654515)
![Surface Caching
[Images from Bush15]
• The beginning of global illumination in games…
• One of the first games to store pr...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-9-2048.jpg?cb=1665654515)
![Radiosity Normal Mapping
• As seen in Half-Life 2 [McTaggart04]
• Avoids flat ambient
• Three full RGB lighting values, in...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-10-2048.jpg?cb=1665654515)
![Heightfield GI
• For large area and environmental lights on height fields. Can be dynamic [Nowrouzezahrai09]
• Many improv...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-13-2048.jpg?cb=1665654515)
![Probe-only* Approaches
PRT (Farcry / Division), irradiance volumes ([Tatarchuk05], Quantum Break) in probes
Various unifie...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-15-2048.jpg?cb=1665654515)
![• Generate Virtual Point Lights (VPLs) from Reflective Shadow Maps (RSMs) [Dachsbacher04]
• For the player’s flashlight, b...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-16-2048.jpg?cb=1665654515)
![Light Propagation Volumes
• Render scene into RSMs, inject VPLs in volume, propagate and apply [Kaplanyan09]
• Cascaded wi...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-17-2048.jpg?cb=1665654515)
![Voxel Cone Tracing
• Original idea from [Crassin11], with sparse voxel octree
• Clipmap by [McLaren14] [Pantaleev15], more...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-18-2048.jpg?cb=1665654515)
![Ambient Occlusion?
Multiple frequencies
Ambient Obscurance Baking on the GPU [Sloan16]
• Near-field: vertex/lightmap, cavi...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-19-2048.jpg?cb=1665654515)
![Screen Space GI?
• Screen-Space Diffuse Lighting [Silvennoinen15]
• Inspired by first bounce approximation from SSDO [Rits...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-20-2048.jpg?cb=1665654515)
![Specular GI?
Mostly approximated via:
• Parallax-Corrected Cubemaps [Bech10] [Lagarde12]
• Screen-Space Reflections (SSR) ...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-21-2048.jpg?cb=1665654515)
![The Importance of Specular GI
Indirect Specular with SVOGI [Crassin12]
Open Problems in Real-Time Rendering – SIGGRAPH 2017](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-42-2048.jpg?cb=1665654515)
![Future Light Types
Area lighting is becoming more and more common
Used in several areas in games [Drobot13] [Lagarde14] [H...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-46-2048.jpg?cb=1665654515)
![Denoising / Reconstruction
[Schied17]
[Mara17]
Denoising becomes relevant when considering path tracing as a solution
The ...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-47-2048.jpg?cb=1665654515)
![[AllaChaitanya17] ALLA CHAITANYA, C.R. et Al. Interactive Reconstruction of Monte Carlo Image Sequences using a Recurrent ...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-56-2048.jpg?cb=1665654515)
![[McAuley15] McAULEY, Stephen. Rendering the World of Far Cry 4, GDC 2015, Link
[McGuire13] McGUIRE, Morgan. The Augmented ...](https://image.slidesharecdn.com/siggraph2017acertainslantoflightweb-170826091925/75/Past-Present-and-Future-Challenges-of-Global-Illumination-in-Games-57-2048.jpg?cb=1665654515)
