Use render size for motion vector scale, since we are rendering them at lower resolution.

Making this explicit takes away some recurring confusion.

Assets/Scripts/Fsr2ImageEffect.cs

@@ -196,8 +196,8 @@ namespace FidelityFX
             _dispatchDescription.PreExposure = preExposure;
             _dispatchDescription.EnableSharpening = performSharpenPass;
             _dispatchDescription.Sharpness = sharpness;
-            _dispatchDescription.MotionVectorScale.x = -_renderCamera.pixelWidth;
-            _dispatchDescription.MotionVectorScale.y = -_renderCamera.pixelHeight;
+            _dispatchDescription.MotionVectorScale.x = -_renderSize.x;
+            _dispatchDescription.MotionVectorScale.y = -_renderSize.y;
             _dispatchDescription.RenderSize = _renderSize;
             _dispatchDescription.FrameTimeDelta = Time.unscaledDeltaTime;
             _dispatchDescription.CameraNear = _renderCamera.nearClipPlane;

Assets/Scripts/Fsr2PostProcessEffect.cs

@@ -230,8 +230,8 @@ namespace FidelityFX
             _dispatchDescription.PreExposure = settings.preExposure;
             _dispatchDescription.EnableSharpening = settings.performSharpenPass;
             _dispatchDescription.Sharpness = settings.sharpness;
-            _dispatchDescription.MotionVectorScale.x = -camera.pixelWidth;
-            _dispatchDescription.MotionVectorScale.y = -camera.pixelHeight;
+            _dispatchDescription.MotionVectorScale.x = -RenderSize.x;
+            _dispatchDescription.MotionVectorScale.y = -RenderSize.y;
             _dispatchDescription.RenderSize = RenderSize;
             _dispatchDescription.InputResourceSize = new Vector2Int(context.width, context.height);
             _dispatchDescription.FrameTimeDelta = Time.unscaledDeltaTime;