optional merging of sub-regions

src/meshTools/searchableSurface/searchableSurfaceCollection.C

@@ -36,7 +36,12 @@ namespace Foam
 {
 
 defineTypeNameAndDebug(searchableSurfaceCollection, 0);
-addToRunTimeSelectionTable(searchableSurface, searchableSurfaceCollection, dict);
+addToRunTimeSelectionTable
+(
+    searchableSurface,
+    searchableSurfaceCollection,
+    dict
+);
 
 }
 
@@ -63,15 +68,17 @@ void Foam::searchableSurfaceCollection::findNearest
 
     forAll(subGeom_, surfI)
     {
-        // Transform then divide
+        subGeom_[surfI].findNearest
-        tmp<pointField> localSamples = cmptDivide
+        (
+            cmptDivide  // Transform then divide
             (
                 transform_[surfI].localPosition(samples),
                 scale_[surfI]
+            ),
+            localMinDistSqr,
+            hitInfo
         );
 
-        subGeom_[surfI].findNearest(localSamples, localMinDistSqr, hitInfo);
-
         forAll(hitInfo, pointI)
         {
             if (hitInfo[pointI].hit())
@@ -115,7 +122,8 @@ Foam::searchableSurfaceCollection::searchableSurfaceCollection
     instance_(dict.size()),
     scale_(dict.size()),
     transform_(dict.size()),
-    subGeom_(dict.size())
+    subGeom_(dict.size()),
+    mergeSubRegions_(dict.lookup("mergeSubRegions"))
 {
     Info<< "SearchableCollection : " << name() << endl;
 
@@ -181,14 +189,21 @@ const Foam::wordList& Foam::searchableSurfaceCollection::regions() const
         {
             regionOffset_[surfI] = allRegions.size();
 
+            if (mergeSubRegions_)
+            {
+                // Single name regardless how many regions subsurface has
+                allRegions.append(instance_[surfI] + "_" + Foam::name(surfI));
+            }
+            else
+            {
                 const wordList& subRegions = subGeom_[surfI].regions();
 
                 forAll(subRegions, i)
                 {
-                //allRegions.append(subRegions[i] + "_" + Foam::name(surfI));
                     allRegions.append(instance_[surfI] + "_" + subRegions[i]);
                 }
             }
+        }
         regions_.transfer(allRegions.shrink());
     }
     return regions_;
@@ -369,9 +384,17 @@ void Foam::searchableSurfaceCollection::getRegion
     if (subGeom_.size() == 0)
     {}
     else if (subGeom_.size() == 1)
+    {
+        if (mergeSubRegions_)
+        {
+            region.setSize(info.size());
+            region = regionOffset_[0];
+        }
+        else
         {
             subGeom_[0].getRegion(info, region);
         }
+    }
     else
     {
         region.setSize(info.size());
@@ -429,6 +452,15 @@ void Foam::searchableSurfaceCollection::getRegion
             // Collect points from my surface
             labelList indices(findIndices(nearestSurf, surfI));
 
+            if (mergeSubRegions_)
+            {
+                forAll(indices, i)
+                {
+                    region[indices[i]] = regionOffset_[surfI];
+                }
+            }
+            else
+            {
                 labelList surfRegion;
                 subGeom_[surfI].getRegion
                 (
@@ -442,6 +474,7 @@ void Foam::searchableSurfaceCollection::getRegion
             }
         }
     }
+}
 
 
 void Foam::searchableSurfaceCollection::getNormal

src/meshTools/searchableSurface/searchableSurfaceCollection.H

@@ -40,6 +40,7 @@ SourceFiles
 #include "treeBoundBox.H"
 #include "coordinateSystem.H"
 #include "UPtrList.H"
+#include "Switch.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -73,6 +74,8 @@ private:
 
             UPtrList<searchableSurface> subGeom_;
 
+            Switch mergeSubRegions_;
+
         //- Region names
         mutable wordList regions_;
         //- From individual regions to collection regions