Remove the temporal component from the LOD transition

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitData.hlsl

 void GetSurfaceAndBuiltinData(FragInputs input, float3 V, inout PositionInputs posInput, out SurfaceData surfaceData, out BuiltinData builtinData)
 {
 #ifdef LOD_FADE_CROSSFADE // enable dithering LOD transition if user select CrossFade transition in LOD group
-    LODDitheringTransition(posInput.unPositionSS, unity_LODFade.x, _Time.x);
+    LODDitheringTransition(posInput.unPositionSS, unity_LODFade.x);
 #endif
 
     ApplyDoubleSidedFlipOrMirror(input); // Apply double sided flip on the vertex normal
 void GetSurfaceAndBuiltinData(FragInputs input, float3 V, inout PositionInputs posInput, out SurfaceData surfaceData, out BuiltinData builtinData)
 {
 #ifdef LOD_FADE_CROSSFADE // enable dithering LOD transition if user select CrossFade transition in LOD group
-    LODDitheringTransition(posInput.unPositionSS, unity_LODFade.x, _Time.x);
+    LODDitheringTransition(posInput.unPositionSS, unity_LODFade.x);
 #endif
 
     ApplyDoubleSidedFlipOrMirror(input); // Apply double sided flip on the vertex normal

Assets/ScriptableRenderPipeline/ShaderLibrary/Common.hlsl

 // LOD dithering transition helper
 // LOD0 must use this function with ditherFactor 1..0
 // LOD1 must use this function with ditherFactor 0..1
-void LODDitheringTransition(uint2 unPositionSS, float ditherFactor, float time)
+void LODDitheringTransition(uint2 unPositionSS, float ditherFactor)
-    // Generate a spatio-temporally varying pattern.
-    float p = GenerateHashedRandomFloat(uint3(unPositionSS, asuint(time)));
+    // Generate a spatially varying pattern.
+    // Unfortunately, varying the pattern with time confuses the TAA, increasing the amount of noise.
+    float p = GenerateHashedRandomFloat(unPositionSS);
 
     // We want to have a symmetry between 0..0.5 ditherFactor and 0.5..1 so no pixels are transparent during the transition
     // this is handled by this test which reverse the pattern