Rename and add comments for clarity

ScriptableRenderPipeline/Core/ShaderLibrary/BSDF.hlsl

     return sqrt((-NdotV * a2 + NdotV) * NdotV + a2);
 }
 
+// Note: V = G / (4 * NdotL * NdotV)
 // Ref: http://jcgt.org/published/0003/02/03/paper.pdf
 float V_SmithJointGGX(float NdotL, float NdotV, float roughness, float preLambdaV)
 {
     return sqrt(aT2 * TdotV * TdotV + aB2 * BdotV * BdotV + NdotV * NdotV);
 }
 
+// Note: V = G / (4 * NdotL * NdotV)
 // Ref: https://cedec.cesa.or.jp/2015/session/ENG/14698.html The Rendering Materials of Far Cry 4
 float V_SmithJointGGXAniso(float TdotV, float BdotV, float NdotV, float TdotL, float BdotL, float NdotL, float roughnessT, float roughnessB, float preLambdaV)
 {

ScriptableRenderPipeline/HDRenderPipeline/ShaderVariablesFunctions.hlsl

     return mul(GetWorldToHClipMatrix(), float4(positionWS, 1.0));
 }
 
-float3 GetAbsolutePositionWS(float3 cameraRelativePositionWS)
+float3 GetAbsolutePositionWS(float3 positionWS)
-    float3 pos = cameraRelativePositionWS;
-    pos += _WorldSpaceCameraPos;
+    positionWS += _WorldSpaceCameraPos;
-    return pos;
+    return positionWS;
-float3 GetCameraRelativePositionWS(float3 absolutePositionWS)
+float3 GetCameraRelativePositionWS(float3 positionWS)
-    float3 pos = absolutePositionWS;
-    pos -= _WorldSpaceCameraPos;
+    positionWS -= _WorldSpaceCameraPos;
-    return pos;
+    return positionWS;
 }
 
 // Note: '_WorldSpaceCameraPos' is set by the legacy Unity code.