HDRenderPipeline: Fix planar and triplanar + triplanar POM

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLit.shader

     //-------------------------------------------------------------------------------------
 
     #define UNITY_MATERIAL_LIT // Need to be define before including Material.hlsl
+    // Use surface gradient normal mapping as it handle correctly triplanar normal mapping and multiple UVSet
+    #define SURFACE_GRADIENT
 
     //-------------------------------------------------------------------------------------
     // Include

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLitTessellation.shader

 
     #define UNITY_MATERIAL_LIT // Need to be define before including Material.hlsl    
     #define TESSELLATION_ON
+    // Use surface gradient normal mapping as it handle correctly triplanar normal mapping and multiple UVSet
+    #define SURFACE_GRADIENT
 
     //-------------------------------------------------------------------------------------
     // Include

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

     //-------------------------------------------------------------------------------------
 
     #define UNITY_MATERIAL_LIT // Need to be define before including Material.hlsl
+    // Use surface gradient normal mapping as it handle correctly triplanar normal mapping and multiple UVSet
+    #define SURFACE_GRADIENT
 
     //-------------------------------------------------------------------------------------
     // Include

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

     bool isTriplanar = false;
 
 #if defined(_PER_PIXEL_DISPLACEMENT) &&  defined(_HEIGHTMAP)
+    // All variable are compile time value
     ppdEnable = true;
     isPlanar = layerTexCoord.base.mappingType == UV_MAPPING_PLANAR;
     isTriplanar = layerTexCoord.base.mappingType == UV_MAPPING_TRIPLANAR;
 
         PerPixelHeightDisplacementParam ppdParam;
 
+        // planar/triplanar
+        float2 uvXZ;
+        float2 uvXY;
+        float2 uvZY;
+        GetTriplanarCoordinate(V, uvXZ, uvXY, uvZY);
+
+        // TODO: support object space planar/triplanar ?
+
-            // TODO: implement. Require 3 call to POM + dedicated viewDirTS based on triplanar convention
-            // apply the 3 offset on all layers
-            /*
+            float3 viewDirTS;
+            int numSteps;
+
+            // Perform a POM in each direction and modify appropriate texture coordinate
+            ppdParam.uv = layerTexCoord.base.uvZY;
+            viewDirTS = float3(V.x > 0.0 ? uvZY : -uvZY, V.x);
+            numSteps = (int)lerp(_PPDMaxSamples, _PPDMinSamples, viewDirTS.z);
+            float2 offsetZY = ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirTS, maxHeight, ppdParam);
+
+            // Apply offset to all triplanar UVSet
+            layerTexCoord.base.uvZY += offsetZY;
+            layerTexCoord.details.uvZY += offsetZY;
+
+            ppdParam.uv = layerTexCoord.base.uvXZ;
+            viewDirTS = float3(V.y > 0.0 ? uvXZ : -uvXZ, V.y);
+            numSteps = (int)lerp(_PPDMaxSamples, _PPDMinSamples, viewDirTS.z);
+            float2 offsetXZ = ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirTS, maxHeight, ppdParam);
-            ppdParam.uv = layerTexCoord.base0.uvZY;
+            layerTexCoord.base.uvXZ += offsetXZ;
+            layerTexCoord.details.uvXZ += offsetXZ;
-            float3 viewDirTS = ;
-            int numSteps = (int)lerp(_PPDMaxSamples, _PPDMinSamples, abs(viewDirTS.z));
-            ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirTS, maxHeight, ppdParam);
+            ppdParam.uv = layerTexCoord.base.uvXY;
+            viewDirTS = float3(V.z > 0.0 ? uvXY : -uvXY, V.z);
+            numSteps = (int)lerp(_PPDMaxSamples, _PPDMinSamples, viewDirTS.z);
+            float2 offsetXY = ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirTS, maxHeight, ppdParam);
-            (...)
-            */
+            layerTexCoord.base.uvXY += offsetXY;
+            layerTexCoord.details.uvXY += offsetXY;
-            ppdParam.uv = layerTexCoord.base.uv;
+            ppdParam.uv = layerTexCoord.base.uv; // For planar it is uv too, not uvXZ
 
             #ifdef SURFACE_GRADIENT
             // The TBN is not normalize, normalize it to do per pixel displacement
             float3x3 worldToTangent = input.worldToTangent;
             #endif
 
-            // For planar the view vector is the world view vector (unless we want to support object triplanar ? and in this case used TransformWorldToObject)
-            // TODO: do we support object triplanar ? See ComputeLayerTexCoord
-            float3 viewDirTS = isPlanar ? float3(-V.xz, V.y) : TransformWorldToTangent(V, worldToTangent);
+            float3 viewDirTS = isPlanar ? float3(uvXZ, V.y) : TransformWorldToTangent(V, worldToTangent);
-            // Apply offset to all UVSet
+            // Apply offset to all UVSet0 / planar
-            layerTexCoord.details.uv += offset;
+            layerTexCoord.details.uv += isPlanar ? offset : _UVDetailsMappingMask.x * offset; // Only apply offset if details map use UVSet0 _UVDetailsMappingMask.x will be 1 in this case, else 0
         }
     }
 }

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

     float2 uvXZ;
     float2 uvXY;
     float2 uvZY;
-    GetTriplanarCoordinate(positionWS * worldScale, layerTexCoord.vertexNormalWS, uvXZ, uvXY, uvZY);
+    GetTriplanarCoordinate(positionWS * worldScale, uvXZ, uvXY, uvZY);
  
     // Planar is just XZ of triplanar
     if (mappingType == UV_MAPPING_PLANAR)

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader

 
     #define UNITY_MATERIAL_LIT // Need to be define before including Material.hlsl
     #define TESSELLATION_ON
+    // Use surface gradient normal mapping as it handle correctly triplanar normal mapping and multiple UVSet
+    #define SURFACE_GRADIENT
 
     //-------------------------------------------------------------------------------------
     // Include

Assets/ScriptableRenderPipeline/ShaderLibrary/CommonMaterial.hlsl

     return blendWeights;
 }
 
-// Planar/Triplanar convention for Unity
-// position and vertex normal must be in the same space
-void GetTriplanarCoordinate(float3 position, float3 vertexNormal, out float2 uvXZ, out float2 uvXY, out float2 uvZY)
-{
-    float3 direction = sign(vertexNormal);
-
-    // In triplanar, if we are facing away from the world axis, a different axis will be flipped for each direction.
-    // This is particularly problematic for tangent space normal maps which need to be in the right direction.
-    // So we multiplying the offending coordinate by the sign of the normal.
-    uvXZ = -float2(position.x, direction.y * position.z);
-    uvXY = float2(-position.x, direction.z * position.y);
-    uvZY = float2(direction.x * position.z, position.y);
+// Planar/Triplanar convention for Unity in world space
+void GetTriplanarCoordinate(float3 position, out float2 uvXZ, out float2 uvXY, out float2 uvZY)
+{ 
+    // Caution: This must follow the same rule as what is use for SurfaceGradient triplanar
+    // TODO: Currently the normal mapping looks wrong without SURFACE_GRADIENT option because we don't handle corretly the tangent space
+    uvXZ = float2(position.z, position.x);
+    uvXY = float2(position.x, position.y);
+    uvZY = float2(position.z, position.y);    
 }
 
 float LerpWhiteTo(float b, float t)

Assets/ScriptableRenderPipeline/ShaderLibrary/SampleUVMappingNormalInternal.hlsl

 #ifdef SURFACE_GRADIENT
     else if (uvMapping.mappingType == UV_MAPPING_PLANAR)
     {
-        float2 derivYPlane = UNPACK_DERIVATIVE_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uvXZ, param), scale);
+        // Note: Planar is on uv coordinate (and not uvXZ)
+        float2 derivYPlane = UNPACK_DERIVATIVE_FUNC(SAMPLE_TEXTURE_FUNC(textureName, samplerName, uvMapping.uv, param), scale);
         // See comment above
         float3 volumeGrad = float3(derivYPlane.y, 0.0, derivYPlane.x);
         return SurfaceGradientFromVolumeGradient(uvMapping.normalWS, volumeGrad);

Assets/TestScenes/HDTest/GraphicTest/Parallax Occlusion Mapping/Material/POM - Rock.mat

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Assets/TestScenes/HDTest/GraphicTest/Parallax Occlusion Mapping/Material/POM - Wood.mat

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Assets/TestScenes/HDTest/GraphicTest/Tessellation/Material/Tessellation - Rock.mat

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Assets/TestScenes/HDTest/GraphicTest/Tessellation/Material/Tessellation - Wood.mat

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Assets/TestScenes/HDTest/GraphicTest/LayeredTessellation/Material/Layer-2-woord-rock.mat

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Assets/TestScenes/HDTest/GraphicTest/Parallax Occlusion Mapping/Material/POM - Rock planar.mat

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