Use proper coordinates when sampling color pyramid

Added a pixel offset when returning hit result from HiZ

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/Reflection/ScreenSpaceTracing.hlsl

     }
 
     hit.linearDepth = positionLinearDepth;
-    hit.positionNDC = float2(positionSS.xy) / float2(bufferSize);
+    // Move one pixel in the ray direction
+    // This is where the ray actually hit
+    hit.positionSS += int2(raySS.xy * abs(invRaySS));
+    hit.positionNDC = float2(hit.positionSS) / float2(bufferSize);
 
     // Detect when we go behind an object given a thickness
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/Lit.hlsl

     UpdateLightingHierarchyWeights(hierarchyWeight, weight); // Shouldn't be needed, but safer in case we decide to change hierarchy priority
 
     // Reproject color pyramid
-    float4 velocityBuffer = SAMPLE_TEXTURE2D_LOD(
+    float4 velocityBuffer = LOAD_TEXTURE2D_LOD(
-        s_linear_clamp_sampler,
-        hit.positionNDC * _CameraMotionVectorsScale.xy,
+        hit.positionSS,
         0.0
     );
 
     float3 preLD = SAMPLE_TEXTURE2D_LOD(
         _ColorPyramidTexture,
         s_trilinear_clamp_sampler,
-        (hit.positionNDC - velocityNDC) * _ColorPyramidScale.xy,
+        // Offset by half a texel to properly interpolate between this pixel and its mips
+        (hit.positionNDC - velocityNDC) * _ColorPyramidScale.xy + _ColorPyramidSize.zw * 0.5,
         mipLevel
     ).rgb;