ENH: sampledTriSurfaceMesh: added sampling only inside triangles

src/sampling/sampledSurface/sampledTriSurfaceMesh/sampledTriSurfaceMesh.C

@@ -46,13 +46,14 @@ namespace Foam
     );
 
     template<>
-    const char* NamedEnum<sampledTriSurfaceMesh::samplingSource, 2>::names[] =
+    const char* NamedEnum<sampledTriSurfaceMesh::samplingSource, 3>::names[] =
     {
         "cells",
+        "insideCells",
         "boundaryFaces"
     };
 
-    const NamedEnum<sampledTriSurfaceMesh::samplingSource, 2>
+    const NamedEnum<sampledTriSurfaceMesh::samplingSource, 3>
     sampledTriSurfaceMesh::samplingSourceNames_;
 
 
@@ -147,7 +148,7 @@ bool Foam::sampledTriSurfaceMesh::update(const meshSearch& meshSearcher)
     // elements
     globalIndex globalCells
     (
-        sampleSource_ == cells
+        (sampleSource_ == cells || sampleSource_ == insideCells)
       ? mesh().nCells()
       : mesh().nFaces()
     );
@@ -178,6 +179,25 @@ bool Foam::sampledTriSurfaceMesh::update(const meshSearch& meshSearcher)
             }
         }
     }
+    else if (sampleSource_ == insideCells)
+    {
+        // Search for cell containing point
+
+        const indexedOctree<treeDataCell>& cellTree = meshSearcher.cellTree();
+
+        forAll(fc, triI)
+        {
+            if (cellTree.bb().contains(fc[triI]))
+            {
+                label index = cellTree.findInside(fc[triI]);
+                if (index != -1)
+                {
+                    nearest[triI].first() = 0.0;
+                    nearest[triI].second() = globalCells.toGlobal(index);
+                }
+            }
+        }
+    }
     else
     {
         // Search for nearest boundaryFace
@@ -364,6 +384,19 @@ bool Foam::sampledTriSurfaceMesh::update(const meshSearch& meshSearcher)
                 }
             }
         }
+        else if (sampleSource_ == insideCells)
+        {
+            // samplePoints_   : per surface point a location inside the cell
+            // sampleElements_ : per surface point the cell
+
+            forAll(points(), pointI)
+            {
+                const point& pt = points()[pointI];
+                label cellI = cellOrFaceLabels[pointToFace[pointI]];
+                sampleElements_[pointI] = cellI;
+                samplePoints_[pointI] = pt;
+            }
+        }
         else
         {
             // samplePoints_   : per surface point a location on the boundary
@@ -388,6 +421,9 @@ bool Foam::sampledTriSurfaceMesh::update(const meshSearch& meshSearcher)
         // if sampleSource_ == cells:
         //      samplePoints_   : n/a
         //      sampleElements_ : per surface triangle the cell
+        // if sampleSource_ == insideCells:
+        //      samplePoints_   : n/a
+        //      sampleElements_ : -1 or per surface triangle the cell
         // else:
         //      samplePoints_   : n/a
         //      sampleElements_ : per surface triangle the boundary face
@@ -406,7 +442,7 @@ bool Foam::sampledTriSurfaceMesh::update(const meshSearch& meshSearcher)
 
         if (sampledSurface::interpolate())
         {
-            if (sampleSource_ == cells)
+            if (sampleSource_ == cells || sampleSource_ == insideCells)
             {
                 forAll(samplePoints_, pointI)
                 {
@@ -443,7 +479,7 @@ bool Foam::sampledTriSurfaceMesh::update(const meshSearch& meshSearcher)
         }
         else
         {
-            if (sampleSource_ == cells)
+            if (sampleSource_ == cells || sampleSource_ == insideCells)
             {
                 forAll(sampleElements_, triI)
                 {

src/sampling/sampledSurface/sampledTriSurfaceMesh/sampledTriSurfaceMesh.H

@@ -30,7 +30,7 @@ Description
 
     - it either samples cells or (non-coupled) boundary faces
 
-    - 4 different modes:
+    - 6 different modes:
         - source=cells, interpolate=false:
             finds per triangle centre the nearest cell centre and uses its value
         - source=cells, interpolate=true
@@ -40,6 +40,12 @@ Description
             the boundary of the cell (to make sure interpolateCellPoint
             gets a valid location)
 
+        - source=insideCells, interpolate=false:
+            finds per triangle centre the cell containing it and uses its value.
+            Trims triangles outside mesh.
+        - source=insideCells, interpolate=true
+            Per surface point interpolate cell containing it.
+
         - source=boundaryFaces, interpolate=false:
             finds per triangle centre the nearest point on the boundary
             (uncoupled faces only) and uses the value (or 0 if the nearest
@@ -88,7 +94,8 @@ public:
         enum samplingSource
         {
             cells,
-            boundaryFaces
+            insideCells,
+            boundaryFaces,
         };
 
 private:
@@ -99,7 +106,7 @@ private:
 
     // Private data
 
-        static const NamedEnum<samplingSource, 2> samplingSourceNames_;
+        static const NamedEnum<samplingSource, 3> samplingSourceNames_;
 
         //- Surface to sample on
         const triSurfaceMesh surface_;

src/sampling/sampledSurface/sampledTriSurfaceMesh/sampledTriSurfaceMeshTemplates.C

@@ -38,7 +38,7 @@ Foam::sampledTriSurfaceMesh::sampleField
     tmp<Field<Type> > tvalues(new Field<Type>(sampleElements_.size()));
     Field<Type>& values = tvalues();
 
-    if (sampleSource_ == cells)
+    if (sampleSource_ == cells || sampleSource_ == insideCells)
     {
         // Sample cells
 
@@ -94,7 +94,7 @@ Foam::sampledTriSurfaceMesh::interpolateField
     tmp<Field<Type> > tvalues(new Field<Type>(sampleElements_.size()));
     Field<Type>& values = tvalues();
 
-    if (sampleSource_ == cells)
+    if (sampleSource_ == cells || sampleSource_ == insideCells)
     {
         // Sample cells.