[Refraction] Fix refraction sampling

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

     float3 refractedBackPointWS = EstimateRaycast(V, posInput, preLightData.transmissionPositionWS, preLightData.transmissionRefractV);
 
     // Calculate screen space coordinates of refracted point in back plane
-    float4 refractedBackPointCS = mul(UNITY_MATRIX_VP, float4(refractedBackPointWS, 1.0));
-    float2 refractedBackPointSS = ComputeNormalizedDeviceCoordinates(refractedBackPointCS);
+    float2 refractedBackPointNDC = ComputeNormalizedDeviceCoordinates(refractedBackPointWS, UNITY_MATRIX_VP);
-    float refractedBackPointDepth = LinearEyeDepth(LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, refractedBackPointSS * depthSize, 0).r, _ZBufferParams);
+    float refractedBackPointDepth = LinearEyeDepth(LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, refractedBackPointNDC * depthSize, 0).r, _ZBufferParams);
-        || any(refractedBackPointSS < 0.0)
-        || any(refractedBackPointSS > 1.0))
+        || any(refractedBackPointNDC < 0.0)
+        || any(refractedBackPointNDC > 1.0))
     {
         // Do nothing and don't update the hierarchy weight so we can fall back on refraction probe
         return lighting;
-    lighting.specularTransmitted = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, s_trilinear_clamp_sampler, refractedBackPointSS, preLightData.transmissionSSMipLevel).rgb;
+    lighting.specularTransmitted = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, s_trilinear_clamp_sampler, refractedBackPointNDC, preLightData.transmissionSSMipLevel).rgb;
 
     // Beer-Lamber law for absorption
     lighting.specularTransmitted *= preLightData.transmissionTransmittance;