Clear sky color to black when lux meter is enabled

com.unity.render-pipelines.high-definition/HDRP/RenderPipeline/HDRenderPipeline.cs

                 using (new ProfilingSample(cmd, "Clear HDR target", CustomSamplerId.ClearHDRTarget.GetSampler()))
                 {
                     if (hdCamera.clearColorMode == HDAdditionalCameraData.ClearColorMode.BackgroundColor ||
+                        // If the luxmeter is enabled, the sky isn't rendered so we clear the background color
+                        m_DebugDisplaySettings.lightingDebugSettings.debugLightingMode == DebugLightingMode.LuxMeter ||
                         // If we want the sky but the sky don't exist, still clear with background color
                         (hdCamera.clearColorMode == HDAdditionalCameraData.ClearColorMode.Sky && !m_SkyManager.IsVisualSkyValid()) ||
                         // Special handling for Preview we force to clear with background color (i.e black)
                     {
                         Color clearColor = hdCamera.backgroundColorHDR;
+
+                        // We set the background color to black when the luxmeter is enabled to avoid picking the sky color
+                        if (m_DebugDisplaySettings.lightingDebugSettings.debugLightingMode == DebugLightingMode.LuxMeter)
+                            clearColor = Color.black;
+
                         HDUtils.SetRenderTarget(cmd, hdCamera, m_CameraColorBuffer, m_CameraDepthStencilBuffer, ClearFlag.Color, clearColor);
                     }
                 }

com.unity.render-pipelines.high-definition/HDRP/Sky/SkyRenderingContext.cs

 
                     skyContext.renderer.SetRenderTargets(m_BuiltinParameters);
                     
-                    // If the luxmeter is enabled, we render a black sky
+                    // If the luxmeter is enabled, we don't render the sky
-                    }
-                    else
-                    {
-                        RenderBlackSky(cmd, false);
-        }
-
-        void RenderBlackSky(CommandBuffer cmd, bool renderToCubemap)
-        {
-            Material blackMaterial = new Material(Shader.Find("Hidden/HDRenderPipeline/Sky/Black"));
-            CoreUtils.DrawFullScreen(cmd, blackMaterial, null, renderToCubemap ? 0 : 1);
         }
     }
 }

com.unity.render-pipelines.high-definition/HDRP/Sky/BlackSky.shader

-Shader "Hidden/HDRenderPipeline/Sky/Black"
-{
-    HLSLINCLUDE
-
-    #pragma vertex Vert
-    #pragma fragment Frag
-
-    #pragma target 4.5
-    #pragma only_renderers d3d11 ps4 xboxone vulkan metal switch
-
-    #include "CoreRP/ShaderLibrary/Common.hlsl"
-
-    struct Attributes
-    {
-        uint vertexID : SV_VertexID;
-    };
-
-    struct Varyings
-    {
-        float4 positionCS : SV_POSITION;
-    };
-
-    Varyings Vert(Attributes input)
-    {
-        Varyings output;
-        output.positionCS = GetFullScreenTriangleVertexPosition(input.vertexID, UNITY_RAW_FAR_CLIP_VALUE);
-        return output;
-    }
-
-    float4 Frag(Varyings input) : SV_Target
-    {
-        return float4(0, 0, 0, 1.0);
-    }
-
-    ENDHLSL
-
-    SubShader
-    {
-        // For cubemap
-        Pass
-        {
-            ZWrite Off
-            ZTest Always
-            Blend Off
-            Cull Off
-
-            HLSLPROGRAM
-            ENDHLSL
-
-        }
-
-        // For fullscreen Sky
-        Pass
-        {
-            ZWrite Off
-            ZTest LEqual
-            Blend Off
-            Cull Off
-
-            HLSLPROGRAM
-            ENDHLSL
-        }
-
-    }
-    Fallback Off
-}

com.unity.render-pipelines.high-definition/HDRP/Sky/BlackSky.shader.meta

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