[HDRP][Backport 21.2] Backport various PRs (#6231)

* Increasing HDRP fined pruned light tile count to 63. #5771

* Fix Upscaled Film Grain & Dither in HDRP (#6111)

When using particular types of upscaling, (CAS, FSR, Catmull) the
film grain quality produced by HDRP was lower than expected.

This was caused by errors in the UV scale calculations for the grain
texture.

This change fixes the issue by modifying the scale calculations to
use the final viewport size rather than the size of the current
scaled/unscaled viewport. This works because film grain is always
handled by "FinalPass" which always renders at final viewport size
anyways.

This change also fixes a few cases where the current resolution group
would have been incorrect when CAS or FSR were being used as the
upscaling method.

* Update CHANGELOG.md

* Fix regression that was introduced in a previous PR on the diffuse denoiser #6119

* Fix Light Loop Variant Warnings (1372256) #6135

* Bump the HDRP Template IET Framework Package Version #6134

* Update ray tracing and path tracing docs regarding custom interpolator limitations (#6126)

* [HDRP] Disable DoF for orthographic cameras #6124

* update occlusion radius for directional light sample (#6154)

Co-authored-by: Sean Puller <[email protected]>

* Clean up Public API Documentation #6151

* Fix Sky override not taken into account #6127

* [Fogbugz # 1372245] Hdrp/drs fixing pyramid blur #6136

* Improved Area Light Support for Hair (#6157)

* Initial commit MRP implementation

* Barn door application

* Add dominant marschner lobe direction skeleton

* Finalize rect light MRP for marschner, handle forward + backward hemisphere scattering.

* Force pathtracer to far-field in case users use geometry with bad normals.

* com.unity.render-pipelines.high-definition/Runtime/Material/Hair/MultipleScattering/HairMultipleScattering.hlsl

* Fix SH ringing for multiple scattering

* Add trivial support for cookies

* Add Kajiya support for area light approximation (non-LTC)

* remove Line area light MRP for now

* Remove area rect reference

* Update area light hair test scene and reference images

* Select cookie mip based on solid angle, rename some functions, temporarily add back rect ref

* Remove the useless div-by-1 and add a comment to explain the removal of the divide by PI

* Add a comment to further explain the normalization we do on the longitudinal distribution

* Remove the ref once again

* Update test images for metal and vulkan

* Add a zero-div guard to silence compiler warning

* Update CHANGELOG.md

* [HDRP][Path Tracing] Exposed 3 methods related to path tracing and accumulation. #6197

* [HDRP] Fix infitnite material import loop materials #6185

* fixed typo: users -> uses (#6162)

* Don't blur if nothing to blur (saves memory due to RG) (#6183)

* Fix local fog volumes z axis calculation #6068

* fixed passive voice (#6092)

* Fixed grammar errors

* fixed passive voice in decal doc

* Update Decal.md

* Update Decal.md

* Update Decal.md

* AxF Raytracing: fix performance mode distillation that was broken and removed in #9d6db83478c213bc066e5f728d94b7faa6662543 (#6104)

* Add scale parameter in eye shader #6132

* updated Override Fog page (#6200)

* updated fog override screenshot

* changed Depth Extent to Volumetric Fog Distance

* Fix missing pragma (#6204)

* [HDRP] Fix custom pass motion vector texture access #6205

* Fix typo in MipBias tooltip in HDRenderPipelineUI.Skin (#6210)

* Replace gizmos FindObjectsOfType with list registrations to avoid constant slowdown in large scenes. Merged editor guards blocks. (#6168)

* [HDRP] Fix APV tooltip for Geometry Distance Offset (#6150)

* Update tooltip

* Update ProbeVolumeUI.Skin.cs

* Fixed the point distribution for the diffuse denoiser sometimes not being properly intialized. #6194

* Fixed the bad blending between the sun and the clouds (case 1373282). #6193

* Fix shadow mask fade and optimize it at same time (#6083)

* [HDRP][Path Tracing] Minor fix for SSS when combined with fog (#6215)

* Minor fix for SSS + fog.

* Comments.

* Update 1401_HairGraph_Area_Light.png

* update screenshots

Co-authored-by: Kleber Garcia <[email protected]>
Co-authored-by: gmitrano-unity <[email protected]>
Co-authored-by: anisunity <[email protected]>
Co-authored-by: John Parsaie <[email protected]>
Co-authored-by: Pavlos Mavridis <[email protected]>
Co-authored-by: Sean Puller <[email protected]>
Co-authored-by: Sean Puller <[email protected]>
Co-authored-by: Adrien de Tocqueville <[email protected]>
Co-authored-by: Emmanuel Turquin <[email protected]>
Co-authored-by: Antoine Lelievre <[email protected]>
Co-authored-by: emilybrown1 <[email protected]>
Co-authored-by: FrancescoC-unity <[email protected]>
Co-authored-by: RemyUnity <[email protected]>
Co-authored-by: slunity <[email protected]>
Co-authored-by: James-Burr-Unity <[email protected]>
Co-authored-by: Torbjorn Laedre <[email protected]>

Author: 17 people

TestProjects/HDRP_DXR_Tests/Assets/Samples/High Definition RP/MaterialSamples/Shadergraphs/SG_Eye.shadergraph

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