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com.unity.render-pipelines.high-definition/HDRP/Lighting/Volumetrics/VBuffer.hlsl

             BiquadraticFilter(1 - fc, weights, offsets); // Inverse-translate the filter centered around 0.5
 
             // Apply the viewport scale right at the end.
+            // TODO: perform per-sample (4, in this case) bilateral filtering, rather than per-pixel. This should reduce leaking.
             // TODO: precompute (VBufferResolution.zw * VBufferUvScale).
             result = (weights[0].x * weights[0].y) * SAMPLE_TEXTURE3D_LOD(VBuffer, clampSampler, float3(min((ic + float2(offsets[0].x, offsets[0].y)) * (VBufferResolution.zw * VBufferUvScale), VBufferUvLimit), w), 0)  // Top left
                    + (weights[1].x * weights[0].y) * SAMPLE_TEXTURE3D_LOD(VBuffer, clampSampler, float3(min((ic + float2(offsets[1].x, offsets[0].y)) * (VBufferResolution.zw * VBufferUvScale), VBufferUvLimit), w), 0)  // Top right