Add debug view for Motion Vector Intensities

Add a debug view to be able to visualize motion vectors intensities. The standard debug view is a bit hard to read w.r.t intensities. 

https://fogbugz.unity3d.com/f/cases/1430303/

![2022-05-24_14-25-31](https://media.github.cds.internal.unity3d.com/user/582/files/c788eb2f-144c-400c-8f9a-aa296c7b1e45)

Packages/com.unity.render-pipelines.high-definition/Runtime/Debug/DebugDisplay.cs

@@ -117,6 +117,8 @@ public enum FullScreenDebugMode
         MinRenderingFullScreenDebug,
         /// <summary>Display Motion Vectors.</summary>
         MotionVectors,
+        /// <summary>Display Motion Vectors Intensity.</summary>
+        MotionVectorsIntensity,
         /// <summary>Display NaNs.</summary>
         NanTracker,
         /// <summary>Display Log of the color buffer.</summary>
@@ -317,6 +319,10 @@ public partial class DebugData
 
             /// <summary>Minimum length a motion vector needs to be to be displayed in the debug display. Unit is pixels.</summary>
             public float minMotionVectorLength = 0.0f;
+            /// <summary>The scale to apply to motion vector lengths (in Normalized Device Coordinates) to be applied before display.</summary>
+            public float motionVecVisualizationScale = 40.0f;
+            /// <summary>Whether to visualize motion vector intensity as heat map or greyscale (if off).</summary>
+            public bool motionVecIntensityHeat = false;
 
 
             // TODO: The only reason this exist is because of Material/Engine debug enums
@@ -1832,12 +1838,22 @@ void RegisterRenderingDebug()
             {
                 widgetList.Add(new DebugUI.Container
                 {
-                    isHiddenCallback = () => data.fullScreenDebugMode != FullScreenDebugMode.MotionVectors,
+                    isHiddenCallback = () => (data.fullScreenDebugMode != FullScreenDebugMode.MotionVectors || data.fullScreenDebugMode != FullScreenDebugMode.MotionVectorsIntensity),
                     children =
                     {
                         new DebugUI.FloatField {displayName = "Min Motion Vector Length (in pixels)", getter = () => data.minMotionVectorLength, setter = value => data.minMotionVectorLength = value, min = () => 0}
                     }
                 });
+                widgetList.Add(new DebugUI.Container
+                {
+                    isHiddenCallback = () => (data.fullScreenDebugMode != FullScreenDebugMode.MotionVectorsIntensity),
+                    children =
+                    {
+                        new DebugUI.FloatField {displayName = "Motion Vector Scale", getter = () => data.motionVecVisualizationScale, setter = value => data.motionVecVisualizationScale = value, min = () => 0},
+                        new DebugUI.BoolField {displayName = "Visualize as Heat map", getter = () => data.motionVecIntensityHeat, setter = value => data.motionVecIntensityHeat = value }
+                    }
+                });
+
             }
 
             widgetList.AddRange(new DebugUI.Widget[]

Packages/com.unity.render-pipelines.high-definition/Runtime/Debug/DebugDisplay.cs.hlsl

@@ -31,20 +31,21 @@
 #define FULLSCREENDEBUGMODE_MAX_LIGHTING_FULL_SCREEN_DEBUG (21)
 #define FULLSCREENDEBUGMODE_MIN_RENDERING_FULL_SCREEN_DEBUG (22)
 #define FULLSCREENDEBUGMODE_MOTION_VECTORS (23)
-#define FULLSCREENDEBUGMODE_NAN_TRACKER (24)
-#define FULLSCREENDEBUGMODE_COLOR_LOG (25)
-#define FULLSCREENDEBUGMODE_DEPTH_OF_FIELD_COC (26)
-#define FULLSCREENDEBUGMODE_TRANSPARENCY_OVERDRAW (27)
-#define FULLSCREENDEBUGMODE_QUAD_OVERDRAW (28)
-#define FULLSCREENDEBUGMODE_VERTEX_DENSITY (29)
-#define FULLSCREENDEBUGMODE_REQUESTED_VIRTUAL_TEXTURE_TILES (30)
-#define FULLSCREENDEBUGMODE_LENS_FLARE_DATA_DRIVEN (31)
-#define FULLSCREENDEBUGMODE_MAX_RENDERING_FULL_SCREEN_DEBUG (32)
-#define FULLSCREENDEBUGMODE_MIN_MATERIAL_FULL_SCREEN_DEBUG (33)
-#define FULLSCREENDEBUGMODE_VALIDATE_DIFFUSE_COLOR (34)
-#define FULLSCREENDEBUGMODE_VALIDATE_SPECULAR_COLOR (35)
-#define FULLSCREENDEBUGMODE_MAX_MATERIAL_FULL_SCREEN_DEBUG (36)
-#define FULLSCREENDEBUGMODE_WORLD_SPACE_POSITION (37)
+#define FULLSCREENDEBUGMODE_MOTION_VECTORS_INTENSITY (24)
+#define FULLSCREENDEBUGMODE_NAN_TRACKER (25)
+#define FULLSCREENDEBUGMODE_COLOR_LOG (26)
+#define FULLSCREENDEBUGMODE_DEPTH_OF_FIELD_COC (27)
+#define FULLSCREENDEBUGMODE_TRANSPARENCY_OVERDRAW (28)
+#define FULLSCREENDEBUGMODE_QUAD_OVERDRAW (29)
+#define FULLSCREENDEBUGMODE_VERTEX_DENSITY (30)
+#define FULLSCREENDEBUGMODE_REQUESTED_VIRTUAL_TEXTURE_TILES (31)
+#define FULLSCREENDEBUGMODE_LENS_FLARE_DATA_DRIVEN (32)
+#define FULLSCREENDEBUGMODE_MAX_RENDERING_FULL_SCREEN_DEBUG (33)
+#define FULLSCREENDEBUGMODE_MIN_MATERIAL_FULL_SCREEN_DEBUG (34)
+#define FULLSCREENDEBUGMODE_VALIDATE_DIFFUSE_COLOR (35)
+#define FULLSCREENDEBUGMODE_VALIDATE_SPECULAR_COLOR (36)
+#define FULLSCREENDEBUGMODE_MAX_MATERIAL_FULL_SCREEN_DEBUG (37)
+#define FULLSCREENDEBUGMODE_WORLD_SPACE_POSITION (38)
 
 // Generated from UnityEngine.Rendering.HighDefinition.ShaderVariablesDebugDisplay
 // PackingRules = Exact

Packages/com.unity.render-pipelines.high-definition/Runtime/Debug/DebugFullScreen.shader

@@ -36,8 +36,12 @@ Shader "Hidden/HDRP/DebugFullScreen"
             uint _DebugContactShadowLightIndex;
             int _DebugDepthPyramidMip;
             float _MinMotionVector;
+            float4 _MotionVecIntensityParams;
             CBUFFER_END
 
+            #define _MotionVecIntensityScale _MotionVecIntensityParams.x
+            #define _MotionVecHeatMode _MotionVecIntensityParams.y
+
             TEXTURE2D_X(_DebugFullScreenTexture);
 
             struct Attributes
@@ -148,11 +152,16 @@ Shader "Hidden/HDRP/DebugFullScreen"
             {
                 float2 motionVectorNDC;
                 DecodeMotionVector(SAMPLE_TEXTURE2D_X(_DebugFullScreenTexture, s_point_clamp_sampler, coords), motionVectorNDC);
-
                 return motionVectorNDC;
             }
             // end motion vector utilties
 
+            float3 ToHeat(float value)
+            {
+                float3 r = value * 2.1f - float3(1.8f, 1.14f, 0.3f);
+                return 1.0f - r * r;
+            }
+
             float4 Frag(Varyings input) : SV_Target
             {
                 UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
@@ -223,6 +232,17 @@ Shader "Hidden/HDRP/DebugFullScreen"
                 {
                     return SAMPLE_TEXTURE2D_X(_DebugFullScreenTexture, s_point_clamp_sampler, input.texcoord);
                 }
+                if (_FullScreenDebugMode == FULLSCREENDEBUGMODE_MOTION_VECTORS_INTENSITY)
+                {
+                    float2 mv = SampleMotionVectors(input.texcoord);
+                    float mvLen = length(mv) * _MotionVecIntensityScale;
+
+                    if (_MotionVecHeatMode)
+                        return float4(ToHeat(saturate(mvLen)), 1);
+
+                    return float4(mvLen.xxx, 1);
+
+                }
                 if (_FullScreenDebugMode == FULLSCREENDEBUGMODE_MOTION_VECTORS)
                 {
                     float2 mv = SampleMotionVectors(input.texcoord);

Packages/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.Debug.cs

@@ -593,6 +593,7 @@ TextureHandle ResolveFullScreenDebug(RenderGraph renderGraph, TextureHandle inpu
                         mpb.SetFloat(HDShaderIDs._QuadOverdrawMaxQuadCost, (float)data.debugDisplaySettings.data.maxQuadCost);
                         mpb.SetFloat(HDShaderIDs._VertexDensityMaxPixelCost, (float)data.debugDisplaySettings.data.maxVertexDensity);
                         mpb.SetFloat(HDShaderIDs._MinMotionVector, data.debugDisplaySettings.data.minMotionVectorLength);
+                        mpb.SetVector(HDShaderIDs._MotionVecIntensityParams, new Vector4(data.debugDisplaySettings.data.motionVecVisualizationScale, data.debugDisplaySettings.data.motionVecIntensityHeat ? 1 : 0, 0, 0));
 
                         if (fullscreenBuffer != null)
                             ctx.cmd.SetRandomWriteTarget(1, fullscreenBuffer);

Packages/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.RenderGraph.cs

@@ -225,7 +225,10 @@ void RecordRenderGraph(RenderRequest renderRequest,
 
                     // We push the motion vector debug texture here as transparent object can overwrite the motion vector texture content.
                     if (m_Asset.currentPlatformRenderPipelineSettings.supportMotionVectors)
+                    {
                         PushFullScreenDebugTexture(m_RenderGraph, prepassOutput.resolvedMotionVectorsBuffer, FullScreenDebugMode.MotionVectors, fullScreenDebugFormat);
+                        PushFullScreenDebugTexture(m_RenderGraph, prepassOutput.resolvedMotionVectorsBuffer, FullScreenDebugMode.MotionVectorsIntensity, fullScreenDebugFormat);
+                    }
 
                     // Transparent objects may write to the depth and motion vectors buffers.
                     if (aovRequest.isValid)

Packages/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDStringConstants.cs

@@ -450,6 +450,7 @@ static class HDShaderIDs
         public static readonly int _QuadOverdrawMaxQuadCost = Shader.PropertyToID("_QuadOverdrawMaxQuadCost");
         public static readonly int _VertexDensityMaxPixelCost = Shader.PropertyToID("_VertexDensityMaxPixelCost");
         public static readonly int _MinMotionVector = Shader.PropertyToID("_MinMotionVector");
+        public static readonly int _MotionVecIntensityParams = Shader.PropertyToID("_MotionVecIntensityParams");
         public static readonly int _CustomDepthTexture = Shader.PropertyToID("_CustomDepthTexture");
         public static readonly int _CustomColorTexture = Shader.PropertyToID("_CustomColorTexture");
         public static readonly int _CustomPassInjectionPoint = Shader.PropertyToID("_CustomPassInjectionPoint");

Tests/SRPTests/Projects/HDRP_Tests/Assets/GraphicTests/Scenes/3x_DebugView/3004_QuadOverdraw.unity

@@ -106,7 +106,7 @@ NavMeshSettings:
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@@ -119,7 +119,7 @@ NavMeshSettings:
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     manualTileSize: 0
     tileSize: 256
-    accuratePlacement: 0
+    buildHeightMesh: 0
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@@ -276,7 +276,9 @@ PrefabInstance:
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@@ -358,7 +360,7 @@ MonoBehaviour:
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@@ -429,19 +431,20 @@ MonoScript:
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   m_Namespace: UnityEngine.Rendering.HighDefinition
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@@ -505,5 +508,7 @@ PrefabInstance:
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Tests/SRPTests/Projects/HDRP_Tests/Assets/GraphicTests/Scenes/3x_DebugView/3005_VertexDensity.unity

@@ -106,7 +106,7 @@ NavMeshSettings:
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   m_ObjectHideFlags: 0
   m_BuildSettings:
-    serializedVersion: 2
+    serializedVersion: 3
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@@ -119,7 +119,7 @@ NavMeshSettings:
     cellSize: 0.16666667
     manualTileSize: 0
     tileSize: 256
-    accuratePlacement: 0
+    buildHeightMesh: 0
     maxJobWorkers: 0
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     debug:
@@ -178,7 +178,7 @@ PrefabInstance:
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@@ -276,7 +276,9 @@ PrefabInstance:
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@@ -429,19 +431,20 @@ MonoScript:
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