ENH: use volume field name for interpolated fields

- avoids things like "volPointInterpolate(U)", but will likely cause
  issues when used together with identically named Lagrangian fields!

applications/utilities/postProcessing/graphics/PV3Readers/PV3FoamReader/vtkPV3Foam/vtkPV3Foam.H

@@ -594,20 +594,22 @@ class vtkPV3Foam
                 vtkMultiBlockDataSet* output
             );
 
-            //- Point field - all selected parts
+            //- Point field - all selected parts, use specified display name
             template<class Type>
             void convertPointFieldBlock
             (
+                const word& displayName,
                 const GeometricField<Type, pointPatchField, pointMesh>&,
                 vtkMultiBlockDataSet* output,
                 const arrayRange&,
                 const List<polyDecomp>&
             );
 
-            //- Point fields
+            //- Point field, use specified display name
             template<class Type>
             void convertPointField
             (
+                const word& displayName,
                 const GeometricField<Type, pointPatchField, pointMesh>&,
                 const GeometricField<Type, fvPatchField, volMesh>&,
                 vtkMultiBlockDataSet* output,
@@ -616,11 +618,11 @@ class vtkPV3Foam
                 const polyDecomp&
             );
 
-            //- Patch point field
+            //- Patch point field, use specified display name
             template<class Type>
             void convertPatchPointField
             (
-                const word& name,
+                const word& displayName,
                 const Field<Type>&,
                 vtkMultiBlockDataSet* output,
                 const arrayRange&,

applications/utilities/postProcessing/graphics/PV3Readers/PV3FoamReader/vtkPV3Foam/vtkPV3FoamPointFields.H

@@ -76,6 +76,7 @@ void Foam::vtkPV3Foam::convertPointFields
         // Convert activated internalMesh regions
         convertPointFieldBlock
         (
+            fieldName,
             ptf,
             output,
             arrayRangeVolume_,
@@ -85,6 +86,7 @@ void Foam::vtkPV3Foam::convertPointFields
         // Convert activated cellZones
         convertPointFieldBlock
         (
+            fieldName,
             ptf,
             output,
             arrayRangeCellZones_,
@@ -94,6 +96,7 @@ void Foam::vtkPV3Foam::convertPointFields
         // Convert activated cellSets
         convertPointFieldBlock
         (
+            fieldName,
             ptf,
             output,
             arrayRangeCellSets_,
@@ -136,6 +139,7 @@ void Foam::vtkPV3Foam::convertPointFields
 template<class Type>
 void Foam::vtkPV3Foam::convertPointFieldBlock
 (
+    const word& displayName,
     const GeometricField<Type, pointPatchField, pointMesh>& ptf,
     vtkMultiBlockDataSet* output,
     const arrayRange& range,
@@ -150,6 +154,7 @@ void Foam::vtkPV3Foam::convertPointFieldBlock
        {
            convertPointField
            (
+               displayName,
                ptf,
                GeometricField<Type, fvPatchField, volMesh>::null(),
                output,
@@ -165,6 +170,7 @@ void Foam::vtkPV3Foam::convertPointFieldBlock
 template<class Type>
 void Foam::vtkPV3Foam::convertPointField
 (
+    const word& displayName,
     const GeometricField<Type, pointPatchField, pointMesh>& ptf,
     const GeometricField<Type, fvPatchField, volMesh>& tf,
     vtkMultiBlockDataSet* output,
@@ -192,7 +198,7 @@ void Foam::vtkPV3Foam::convertPointField
     pointData->SetNumberOfTuples(nPoints + addPointCellLabels.size());
     pointData->SetNumberOfComponents(nComp);
     pointData->Allocate(nComp*(nPoints + addPointCellLabels.size()));
-    pointData->SetName(ptf.name().c_str());
+    pointData->SetName(displayName.c_str());
 
     if (debug)
     {

applications/utilities/postProcessing/graphics/PV3Readers/PV3FoamReader/vtkPV3Foam/vtkPV3FoamVolFields.H

@@ -113,8 +113,7 @@ void Foam::vtkPV3Foam::convertVolFields
 
         // The name for the interpolated patch point field must be consistent
         // with the interpolated volume point field.
-        // This could be done better.
+        const word& pointFldName = tf.name();
-        const word pointFldName = "volPointInterpolate(" + tf.name() + ')';
 
         for
         (
@@ -276,21 +275,14 @@ void Foam::vtkPV3Foam::convertVolFieldBlock
     const List<polyDecomp>& decompLst
 )
 {
+    const word& pointFldName = tf.name();
+
     for (int partId = range.start(); partId < range.end(); ++partId)
     {
         const label datasetNo = partDataset_[partId];
 
         if (datasetNo >= 0 && partStatus_[partId])
         {
-            convertVolField
-            (
-                tf,
-                output,
-                range,
-                datasetNo,
-                decompLst[datasetNo]
-            );
-
             if (!ptfPtr.valid())
             {
                 if (debug)
@@ -305,8 +297,18 @@ void Foam::vtkPV3Foam::convertVolFieldBlock
                 );
             }
 
+            convertVolField
+            (
+                tf,
+                output,
+                range,
+                datasetNo,
+                decompLst[datasetNo]
+            );
+
             convertPointField
             (
+                pointFldName,
                 ptfPtr(),
                 tf,
                 output,