Avoid issues causing faulty transitions in shadows (resulting in no shadows with unconventional aspect ratio) (#2776)

* Fixed volume component tooltips using the same parameter name (#2754)

* Use the proper history info for Bicubic resampling in TAA (#2759)

* Use proper info for previous buffer info

* changelog

* Fixed lookdev movement (#2757)

Co-authored-by: sebastienlagarde <sebastien@unity3d.com>

* [HDRP] Fix issue with saving some quality settings in volume overrides (#2758)

* Fix issue with saving some quality settings volume overrides

* Fix typo in changelog

Co-authored-by: sebastienlagarde <sebastien@unity3d.com>

* [HDRP] Fixed NullReferenceException in HDRenderPipeline.UpgradeResourcesIfNeeded (case 1292524) (#2765)

* fix issue with confusing text (#2766)

* Fix

* Fix white dots

* Changelog

* Rename the sunrise icon to fix typo, causing issue with 2x resolution loading. (#2809)

* [HDRP] Rename HDRP to HD Render Pipeline in menu item (#2819)

* [HDRP] Update HDRP menu in shader graph

* Update CHANGELOG.md

* HDRP/Fix package version showing package after the last "verified" package (#2783)

* Fix typo

* Remove last version checker from wizard and add link to package manager instead

* Update CHANGELOG.md

* Update documentation

* Update Render-Pipeline-Wizard.md

Co-authored-by: Sebastien Lagarde <sebastien@unity3d.com>

* Revert bad changelog merge

* Update CHANGELOG.md

* Update CHANGELOG.md

Co-authored-by: Adrien de Tocqueville <adrien.tocqueville@unity3d.com>
Co-authored-by: sebastienlagarde <sebastien@unity3d.com>
Co-authored-by: Pavlos Mavridis <pavlos.mavridis@unity3d.com>
Co-authored-by: John Parsaie <johnpa@unity3d.com>
Co-authored-by: Remi Slysz <40034005+RSlysz@users.noreply.github.com>

Author: 6 people

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed probe volumes debug views.
 - Fixed ShaderGraph Decal material not showing exposed properties.
 - Fixed wrong coat normal space in shader graph
+- Fixed issue with faulty shadow transition when view is close to an object under some aspect ratio conditions
 
 ### Changed
 - Removed the material pass probe volumes evaluation mode.

com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/HDShadowAlgorithms.hlsl

@@ -206,12 +206,15 @@ int EvalShadow_GetSplitIndex(HDShadowContext shadowContext, int index, float3 po
 
     // The above code will generate transitions on the whole cascade sphere boundary.
     // It means that depending on the light and camera direction, sometimes the transition appears on the wrong side of the cascade
-    // To avoid that we attenuate the effect (lerp to 0.0) when view direction and cascade center to pixel vector face opposite directions.
+    // To avoid that we attenuate the effect (lerp very sharply to 0.0) when view direction and cascade center to pixel vector face opposite directions.
     // This way you only get fade out on the right side of the cascade.
     float3 viewDir = GetWorldSpaceViewDir(positionWS);
-    float  cascDot = dot(viewDir, wposDir);
-    alpha = lerp(alpha, 0.0, saturate(cascDot * 4.0));
 
+    float  cascDot = dot(viewDir, wposDir);
+    // At high border sizes the sharp lerp is noticeable, hence we need to lerp how sharpenss factor
+    // if we are below 80% we keep the very sharp transition.
+    float lerpSharpness = 8.0f + 512.0f * smoothstep(1.0f, 0.7f, border);// lerp(1024.0f, 8.0f, saturate(border - 0.8) / 0.2f);
+    alpha = lerp(alpha, 0.0, saturate(cascDot * lerpSharpness));
     return shadowSplitIndex;
 }
 
@@ -298,7 +301,7 @@ float EvalShadow_CascadedDepth_Dither_SplitIndex(HDShadowContext shadowContext,
 
         /* We select what split we need to sample from */
         float nextSplit = min(shadowSplitIndex + 1, cascadeCount - 1);
-        bool evalNextCascade = nextSplit != shadowSplitIndex && step(InterleavedGradientNoise(positionSS.xy, _TaaFrameInfo.z), alpha);
+        bool evalNextCascade = nextSplit != shadowSplitIndex && alpha > 0 && step(InterleavedGradientNoise(positionSS.xy, _TaaFrameInfo.z), alpha);
 
         if (evalNextCascade)
         {