User:Jbakker/projects/CyclesOpenCL2019/ProRender

Render loop

ProRender has an Adaptive renderer and a Monte carlo based renderer. We focus on the Monte Carlo based renderer.

1. for each tile
   1. generate tile domain (GenerateTileDomain; updates a list of indices (every output pixels gets a number), this index is used to reduce the work-group/item lookup in other kernels)
   2. generate prim rays; Based on the type of camera the primary rays are generated. Every type of camera has its own Kernel (PerspectiveCamera_GeneratePaths, PerspectiveCameraDof_GeneratePaths, OrthographicCamera_GeneratePaths)
   3. estimate
      1. InitPathData InitPathData
      2. for each pass
         1. Clear ray hit buffer
         2. Query intersection: provided by RadeonRays
         3. Sample volume SampleVolume; Applies volume effects (absorbtion, emission) and scattering, also happens for missed rays.
         4. Shade miss (environment) ShadeMiss Illuminate missing rays
         5. Filter path stream FilterPathStream; convert intersections to predicates (Kill, Alive)
         6. Gather Opacity (optional) GatherOpacity; Gather opacity information and store it in opacity buffer
         7. Compact batch: provided by RadeonRays
         8. Advance indices to keep pixel indices up to date RestorePixelIndices;
         9. Shade miss primary ray (background) ShadeBackgroundEnvMap; Illuminate missing rays
         10. Shade volume ShadeVolumeUberV2; It applies direct illumination and generates (only scattered paths)
         11. Shade surface ShadeSurfaceUberV2; Handle ray-surface interaction possibly generating path continuation
         12. for each transmission step
             1. QueryIntersection
             2. Apply volume transmission ApplyVolumeTransmissionUberV2; Handle light samples and visibility info and add contribution to final buffer
         13. Query occlusion (shadow rays): provided by RadeonRays
         14. Gather light samples GatherLightSamples; Handle light samples and visibility info and add contribution to final buffer
         15. Gather visibility (optional) GatherVisibility; Handle light samples and visibility info and add contribution to final buffer
      3. Gather opacity GatherOpacity; Gather opacity information and store it in opacity buffer
   4. Fill AOV's GenerateTileDomain, GeneratePrimaryRays, FillAOVsUberV2

Note: Source code of shaders is generated from the materials. Data of the shaders are passed along. So perhaps only a recompilation if the material is restructured?