* Radiosity integration and temporal accumulation are now full resolution
* Radiosity traces from probe positions, controlled by r.LumenScene.Radiosity.ProbeSpacing and r.LumenScene.Radiosity.HemisphereProbeResolution
Spatial reuse
* Spatial filtering on probe radiance
* Probe interpolation and spatial filter implement probe plane weighting and probe occlusion to reduce leaking
* No spatial filtering across cards yet
Temporal reuse
* Ray directions and probe placement are jittered across page updates, with the final integrated irradiance temporally accumulated using linear weights
* Radiosity integration now temporally accumulates using typed UAV loads. History length is controlled by r.LumenScene.Radiosity.Temporal.MaxFramesAccumulated
* Card pages to be updated for Radiosity are resampled from the indirect lighting atlas to the new resolution in the card capture atlas, and then copied back to the indirect lighting atlas, maintaining Radiosity history when card pages are resized (r.LumenScene.SurfaceCache.ResampleLighting)
Hardware Ray Tracing
* Radiosity traces now use AvoidSelfIntersectionTrace, which skips backfaces for a short distance and then intersects backfaces for the rest of the trace to prevent leaking even when starting somewhat inside the mesh
* The Surface Cache is no longer interpolated to trace backface hits, fixing leaking, and preventing Radiosity texels inside walls from picking up sky lighting
Costs the same as previous Radiosity gather, but adds 160mb for all the persistent atlases. Lighting propagation speed is 4x slower due to r.LumenScene.Radiosity.Temporal.MaxFramesAccumulated.
#preflight 61eb773c5706089488f734e0
#rb Patrick.Kelly
#ROBOMERGE-AUTHOR: daniel.wright
#ROBOMERGE-SOURCE: CL 18710273 in //UE5/Release-5.0/... via CL 18710287 via CL 18710529
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v903-18687472)
[CL 18710632 by daniel wright in ue5-main branch]
* First all cards are allocated to a temporary atlas of fixed size set by r.LumenScene.CardCaptureAtlasFactor
* After cards are captured into temporary atlas, they are compressed into final BC compressed atlas. Compression can be disabled with r.LumenScene.SurfaceCache.Compress
* Atlas clears were also converted to support clearing compressed surfaces
* Atlas capture operations work on uploaded rect list, instead of a GPU generated card list
* Renamed r.LumenSurfaceCache.* to r.LumenScene.SurfaceCache.*
* Renamed LumenSceneLighting.usf to LumenSurfaceCache.usf
* Renamed LumenScenePrefilter.cpp to LumenSurfaceCache.cpp
Cuts down VRAM memory usage by 160mb
Compression performance on console: ~0.18ms for 1M texels (~0.9ms with UAV aliasing path, which is currently disabled due to missing pieces in RHI)
[CL 16160800 by Krzysztof Narkowicz in ue5-main branch]
