Improve bilateral weighting

Assets/ScriptableRenderLoop/HDRenderPipeline/HDRenderPipeline.cs

             float distanceToProjectionWindow = 1.0f / Mathf.Tan(0.5f * Mathf.Deg2Rad * hdCamera.camera.fieldOfView);
             m_CombineSubsurfaceScattering.SetFloat("_DistToProjWindow", distanceToProjectionWindow);
             // Note: the user-provided bilateral scale is reversed (compared to the one in the shader).
-            m_CombineSubsurfaceScattering.SetFloat("_BilateralScale", 4.0f * (1.0f - sssParameters.bilateralScale));
+            m_CombineSubsurfaceScattering.SetFloat("_BilateralScale", 256.0f * (1.0f - sssParameters.bilateralScale));
             // TODO: use user-defined values for '_ProfileID' and '_FilterRadius.'
             m_CombineSubsurfaceScattering.SetVectorArray("_FilterKernel", sssParameters.profiles[0].filterKernel);
             m_CombineSubsurfaceScattering.SetFloat("_FilterRadius", 5.0f);

Assets/ScriptableRenderLoop/HDRenderPipeline/Material/Lit/Resources/CombineSubsurfaceScattering.shader

                     // Apply bilateral filtering.
                     float sDepth = LinearEyeDepth(rawDepth, _ZBufferParams);
                     float dDepth = abs(sDepth - cDepth);
-                    float dScale = _FilterRadius * _DistToProjWindow * _BilateralScale;
+                    float dScale = _BilateralScale / (_FilterRadius * _DistToProjWindow);
                     float t      = saturate(dScale * dDepth);
 
                     // TODO: use real-world distances for weighting.
-                return float4(false ? cIrradiance : filteredIrradiance, 1.0);
+                return float4(filteredIrradiance, 1.0);
             }
             ENDHLSL
         }