Cleanup & debug stuff

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Sky/AtmosphericScattering/AtmosphericScattering.cs

 using System;
-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
+using System.Diagnostics;
 using UnityEngine.Rendering;
 
 namespace UnityEngine.Experimental.Rendering.HDPipeline
     {
-        private readonly static int m_TypeParam = Shader.PropertyToID("_AtmosphericScatteringType");
+        static readonly int m_TypeParam = Shader.PropertyToID("_AtmosphericScatteringType");
-        private readonly static int m_ColorModeParam = Shader.PropertyToID("_FogColorMode");
-        private readonly static int m_FogColorDensityParam = Shader.PropertyToID("_FogColorDensity");
-        private readonly static int m_MipFogParam = Shader.PropertyToID("_MipFogParameters");
-
+        static readonly int m_ColorModeParam = Shader.PropertyToID("_FogColorMode");
+        static readonly int m_FogColorDensityParam = Shader.PropertyToID("_FogColorDensity");
+        static readonly int m_MipFogParam = Shader.PropertyToID("_MipFogParameters");
-        public FogColorParameter        colorMode = new FogColorParameter { value = FogColorMode.SkyColor };
+        public FogColorParameter       colorMode = new FogColorParameter(FogColorMode.SkyColor);
-        public ColorParameter           color = new ColorParameter(Color.grey);
-        public ClampedFloatParameter    density = new ClampedFloatParameter(1.0f, 0.0f, 1.0f);
+        public ColorParameter          color = new ColorParameter(Color.grey);
+        public ClampedFloatParameter   density = new ClampedFloatParameter(1.0f, 0.0f, 1.0f);
-        public ClampedFloatParameter mipFogMaxMip = new ClampedFloatParameter(1.0f, 0.0f, 1.0f);
+        public ClampedFloatParameter   mipFogMaxMip = new ClampedFloatParameter(1.0f, 0.0f, 1.0f);
-        public MinFloatParameter mipFogNear = new MinFloatParameter(0.0f, 0.0f);
+        public MinFloatParameter       mipFogNear = new MinFloatParameter(0.0f, 0.0f);
-        public MinFloatParameter mipFogFar = new MinFloatParameter(1000.0f, 0.0f);
+        public MinFloatParameter       mipFogFar = new MinFloatParameter(1000.0f, 0.0f);
 
         public abstract void PushShaderParameters(CommandBuffer cmd, FrameSettings frameSettings);
 
         SkyColor,
     }
 
-    [Serializable]
+    [Serializable, DebuggerDisplay(k_DebuggerDisplay)]
-            : base(value, overrideState)
-        {
-        }
+            : base(value, overrideState) { }
-    [Serializable]
-    public sealed class FogColorParameter : VolumeParameter<FogColorMode> { }
+    [Serializable, DebuggerDisplay(k_DebuggerDisplay)]
+    public sealed class FogColorParameter : VolumeParameter<FogColorMode>
+    {
+        public FogColorParameter(FogColorMode value, bool overrideState = false)
+            : base(value, overrideState) { }
+    }
 }

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Sky/SkySettings.cs

 using System;
-using System.Collections.Generic;
+using System.Diagnostics;
 
 namespace UnityEngine.Experimental.Rendering.HDPipeline
 {
         }
     }
 
-    [Serializable]
+    [Serializable, DebuggerDisplay(k_DebuggerDisplay)]
-        public EnvUpdateParameter(EnvironementUpdateMode val, bool overrideState = false)
-            : base(val, overrideState)
-        {
-
-        }
+        public EnvUpdateParameter(EnvironementUpdateMode value, bool overrideState = false)
+            : base(value, overrideState) { }
-
         [Tooltip("Rotation of the sky.")]
         public ClampedFloatParameter    rotation = new ClampedFloatParameter(0.0f, 0.0f, 360.0f);
         [Tooltip("Exposure of the sky in EV.")]
         public MinFloatParameter        updatePeriod = new MinFloatParameter(0.0f, 0.0f);
 
         // Unused for now. In the future we might want to expose this option for very high range skies.
-        private bool    m_useMIS = false;
+        bool m_useMIS = false;
         public bool useMIS { get { return m_useMIS; } }
 
         public override int GetHashCode()