Render black sky when lux meter is enabled

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

                     m_BuiltinParameters.debugSettings = debugSettings;
 
                     skyContext.renderer.SetRenderTargets(m_BuiltinParameters);
-                    // When rendering the visual sky for reflection probes, we need to remove the sun disk if skySettings.includeSunInBaking is false.
-                    skyContext.renderer.RenderSky(m_BuiltinParameters, false, hdCamera.camera.cameraType != CameraType.Reflection || skyContext.skySettings.includeSunInBaking);
+                    
+                    // If the luxmeter is enabled, we render a black sky
+                    if (debugSettings.lightingDebugSettings.debugLightingMode != DebugLightingMode.LuxMeter)
+                    {
+                        // When rendering the visual sky for reflection probes, we need to remove the sun disk if skySettings.includeSunInBaking is false.
+                        skyContext.renderer.RenderSky(m_BuiltinParameters, false, hdCamera.camera.cameraType != CameraType.Reflection || skyContext.skySettings.includeSunInBaking);
+                    }
+                    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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