[HDRP] Fix custom pass volume not executed in scene view (#4860)

* Fix custom pass volume not executed in scene view because of the volume culling mask

* Updated changelog

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

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

@@ -260,6 +260,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed the shader graph files that was still dirty after the first save (case 1342039).
 - Fixed cases in which object and camera motion vectors would cancel out, but didn't.
 - Fixed HDRP material upgrade failing when there is a texture inside the builtin resources assigned in the material (case 1339865).
+- Fixed custom pass volume not executed in scene view because of the volume culling mask.
 
 ### Changed
 - Changed Window/Render Pipeline/HD Render Pipeline Wizard to Window/Rendering/HDRP Wizard

com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/RenderPass/CustomPass/CustomPassVolume.cs

@@ -111,7 +111,8 @@ bool IsVisible(HDCamera hdCamera)
 #endif
 
             // We never execute volume if the layer is not within the culling layers of the camera
-            if ((hdCamera.volumeLayerMask & (1 << gameObject.layer)) == 0)
+            // Special case for the scene view: we can't easily change it's volume later mask, so by default we show all custom passes
+            if (hdCamera.camera.cameraType != CameraType.SceneView && (hdCamera.volumeLayerMask & (1 << gameObject.layer)) == 0)
                 return false;
 
             return true;
@@ -171,8 +172,7 @@ internal static void Update(HDCamera camera)
             // Traverse all volumes
             foreach (var volume in m_ActivePassVolumes)
             {
-                // Ignore volumes that are not in the camera layer mask
-                if ((camera.volumeLayerMask & (1 << volume.gameObject.layer)) == 0)
+                if (!volume.IsVisible(camera))
                     continue;
 
                 // Global volumes always have influence