SSR now allows toggling motion vectors.

PostProcessing/Runtime/Effects/ScreenSpaceReflections.cs

@@ -97,12 +97,19 @@ public sealed class ScreenSpaceReflections : PostProcessEffectSettings
         [Range(0f, 1f), Tooltip("Fades reflections close to the screen edges.")]
         public FloatParameter vignette = new FloatParameter { value = 0.5f };
 
+
+        /// <summary>
+        /// Enables the use of motion vectors to slightly improve visual quality.
+        /// </summary>
+        [Tooltip("Enables the use of motion vectors to slightly improve visual quality.")]
+        public BoolParameter useMotionVectors = new BoolParameter { value = false };
+
         /// <inheritdoc />
         public override bool IsEnabledAndSupported(PostProcessRenderContext context)
         {
             return enabled
                 && context.camera.actualRenderingPath == RenderingPath.DeferredShading
-                && SystemInfo.supportsMotionVectors
+                && (!useMotionVectors.value || SystemInfo.supportsMotionVectors)
                 && SystemInfo.supportsComputeShaders
                 && SystemInfo.copyTextureSupport > CopyTextureSupport.None
                 && context.resources.shaders.screenSpaceReflections
@@ -148,7 +155,14 @@ enum Pass
 
         public override DepthTextureMode GetCameraFlags()
         {
-            return DepthTextureMode.Depth | DepthTextureMode.MotionVectors;
+            if(settings.useMotionVectors.value)
+            {
+                return DepthTextureMode.Depth | DepthTextureMode.MotionVectors;
+            }
+            else
+            {
+                return DepthTextureMode.Depth;
+            }
         }
 
         internal void CheckRT(ref RenderTexture rt, int width, int height, FilterMode filterMode, bool useMipMap)
@@ -207,6 +221,16 @@ public override void Render(PostProcessRenderContext context)
 
             var noiseTex = context.resources.blueNoise256[0];
             var sheet = context.propertySheets.Get(context.resources.shaders.screenSpaceReflections);
+
+            if (settings.useMotionVectors.value)
+            {
+                sheet.EnableKeyword("_UseMotionVectors");
+            }
+            else
+            {
+                sheet.DisableKeyword("_UseMotionVectors");
+            }
+
             sheet.properties.SetTexture(ShaderIDs.Noise, noiseTex);
 
             var screenSpaceProjectionMatrix = new Matrix4x4();

PostProcessing/Shaders/Builtins/ScreenSpaceReflections.hlsl

@@ -54,9 +54,12 @@ Texture2D _MainTex; SamplerState sampler_MainTex;
 Texture2D _History; SamplerState sampler_History;
 
 Texture2D _CameraDepthTexture; SamplerState sampler_CameraDepthTexture;
-Texture2D _CameraMotionVectorsTexture; SamplerState sampler_CameraMotionVectorsTexture;
 Texture2D _CameraReflectionsTexture; SamplerState sampler_CameraReflectionsTexture;
 
+#ifdef _UseMotionVectors
+Texture2D _CameraMotionVectorsTexture; SamplerState sampler_CameraMotionVectorsTexture;
+#endif
+
 Texture2D _CameraGBufferTexture0; // albedo = g[0].rgb
 Texture2D _CameraGBufferTexture1; // roughness = g[1].a
 Texture2D _CameraGBufferTexture2; SamplerState sampler_CameraGBufferTexture2; // normal.xyz 2. * g[2].rgb - 1.
@@ -302,8 +305,12 @@ float4 FragResolve(VaryingsDefault i) : SV_Target
 
 float4 FragReproject(VaryingsDefault i) : SV_Target
 {
-    float2 motion = _CameraMotionVectorsTexture.SampleLevel(sampler_CameraMotionVectorsTexture, i.texcoordStereo, 0).xy;
-    float2 uv = i.texcoord - motion;
+#ifdef _UseMotionVectors	
+	float2 motion = _CameraMotionVectorsTexture.SampleLevel(sampler_CameraMotionVectorsTexture, i.texcoordStereo, 0).xy;
+	float2 uv = i.texcoord - motion;
+#else
+	float2 uv = i.texcoord;
+#endif
 
     const float2 k = SSR_COLOR_NEIGHBORHOOD_SAMPLE_SPREAD * _MainTex_TexelSize.xy;
 
@@ -339,7 +346,11 @@ float4 FragReproject(VaryingsDefault i) : SV_Target
     float4 history = _History.SampleLevel(sampler_History, UnityStereoTransformScreenSpaceTex(uv), 0);
     history = clamp(history, minimum, maximum);
 
+#ifdef _UseMotionVectors	
     color.a = saturate(smoothstep(0.002 * _MainTex_TexelSize.z, 0.0035 * _MainTex_TexelSize.z, length(motion)));
+#else
+	color.a = saturate(smoothstep(0.002 * _MainTex_TexelSize.z, 0.0035 * _MainTex_TexelSize.z, 0));
+#endif
 
     float weight = clamp(lerp(SSR_FINAL_BLEND_STATIC_FACTOR, SSR_FINAL_BLEND_DYNAMIC_FACTOR,
         history.a * 100.0), SSR_FINAL_BLEND_DYNAMIC_FACTOR, SSR_FINAL_BLEND_STATIC_FACTOR);

PostProcessing/Shaders/Builtins/ScreenSpaceReflections.shader

@@ -8,6 +8,8 @@ Shader "Hidden/PostProcessing/ScreenSpaceReflections"
         #include "UnityCG.cginc"
         #pragma target 5.0
 
+		#pragma multi_compile _ _UseMotionVectors
+
         // Ported from StdLib, we can't include it as it'll conflict with internal Unity includes
         struct AttributesDefault
         {