+ implement modifier class to allow limited access to internals of me…

…sh kernel class

src/Mod/Mesh/App/Core/Algorithm.cpp

@@ -43,29 +43,26 @@ using Base::BoundBox2D;
 using Base::Polygon2D;
 
 
-bool MeshAlgorithm::IsVertexVisible (const Base::Vector3f &rcVertex, const Base::Vector3f &rcView, const MeshFacetGrid &rclGrid ) const
-{
-  Base::Vector3f cDirection = rcVertex-rcView;
-  float fDistance = cDirection.Length();
-  Base::Vector3f cIntsct; unsigned long uInd;
-
-  // search for the nearest facet to rcView in direction to rcVertex
-  if ( NearestFacetOnRay( rcView, cDirection, /*1.2f*fDistance,*/ rclGrid, cIntsct, uInd) )
-  {
-    // now check if the facet overlays the point
-    float fLen = Base::Distance( rcView, cIntsct );
-    if ( fLen < fDistance )
-    {
-      // is it the same point?
-      if ( Base::Distance(rcVertex, cIntsct) > 0.001f )
-      {
-        // ok facet overlays the vertex
-        return false;
-      }
+bool MeshAlgorithm::IsVertexVisible (const Base::Vector3f &rcVertex, const Base::Vector3f &rcView, const MeshFacetGrid &rclGrid) const
+{
+    Base::Vector3f cDirection = rcVertex - rcView;
+    float fDistance = cDirection.Length();
+    Base::Vector3f cIntsct; unsigned long uInd;
+
+    // search for the nearest facet to rcView in direction to rcVertex
+    if (NearestFacetOnRay(rcView, cDirection, /*1.2f*fDistance,*/ rclGrid, cIntsct, uInd)) {
+        // now check if the facet overlays the point
+        float fLen = Base::Distance(rcView, cIntsct);
+        if (fLen < fDistance) {
+            // is it the same point?
+            if (Base::Distance(rcVertex, cIntsct) > 0.001f) {
+                // ok facet overlays the vertex
+                return false;
+            }
+        }
     }
-  }
 
-  return true; // no facet between the two points
+    return true; // no facet between the two points
 }
 
 bool MeshAlgorithm::NearestFacetOnRay (const Base::Vector3f &rclPt, const Base::Vector3f &rclDir, Base::Vector3f &rclRes,
@@ -226,10 +223,10 @@ bool MeshAlgorithm::FirstFacetToVertex(const Base::Vector3f &rPt, float fMaxDist
         }
         else {
             // if not then check the distance to the border of the triangle
-            Base::Vector3f res = rPt;
+            Base::Vector3f res;
             float fDist;
             unsigned short uSide;
-            cFacet.ProjectPointToPlane(res);
+            cFacet.ProjectPointToPlane(rPt, res);
             cFacet.NearestEdgeToPoint(res, fDist, uSide);
             if (fDist < fEps) {
                 found = true;

src/Mod/Mesh/App/Core/Degeneration.cpp

@@ -516,8 +516,8 @@ unsigned long MeshFixDegeneratedFacets::RemoveEdgeTooSmall (float fMinEdgeLength
 {
     unsigned long ulCtLastLoop, ulCtFacets = _rclMesh.CountFacets();
 
-    MeshFacetArray &rclFAry = _rclMesh._aclFacetArray;
-    MeshPointArray &rclPAry = _rclMesh._aclPointArray;
+    const MeshFacetArray &rclFAry = _rclMesh.GetFacets();
+    const MeshPointArray &rclPAry = _rclMesh.GetPoints();
     MeshFacetArray::_TConstIterator f_beg = rclFAry.begin();
 
     // repeat until no facet van be removed
@@ -891,11 +891,11 @@ bool MeshEvalFoldOversOnSurface::Evaluate()
 
     return this->indices.empty();
 }
-
-// ----------------------------------------------------------------
-
-bool MeshEvalBorderFacet::Evaluate()
-{
+
+// ----------------------------------------------------------------
+
+bool MeshEvalBorderFacet::Evaluate()
+{
     const MeshCore::MeshFacetArray& facets = _rclMesh.GetFacets();
     MeshCore::MeshFacetArray::_TConstIterator f_it,
         f_beg = facets.begin(), f_end = facets.end();
@@ -915,87 +915,107 @@ bool MeshEvalBorderFacet::Evaluate()
         if (ok)
             _facets.push_back(f_it-f_beg);
     }
-
-    return _facets.empty();
-}
+
+    return _facets.empty();
+}
 
 // ----------------------------------------------------------------------
 
 bool MeshEvalRangeFacet::Evaluate()
 {
-  const MeshFacetArray& rFaces = _rclMesh.GetFacets();
-  unsigned long ulCtFacets = rFaces.size();
+    const MeshFacetArray& rFaces = _rclMesh.GetFacets();
+    unsigned long ulCtFacets = rFaces.size();
 
-  for ( MeshFacetArray::_TConstIterator it = rFaces.begin(); it != rFaces.end(); ++it ) {
-    for ( int i = 0; i < 3; i++ ) {
-      if ((it->_aulNeighbours[i] >= ulCtFacets) && (it->_aulNeighbours[i] < ULONG_MAX)) {
-        return false;
-      }
+    for (MeshFacetArray::_TConstIterator it = rFaces.begin(); it != rFaces.end(); ++it) {
+        for (int i = 0; i < 3; i++) {
+            if ((it->_aulNeighbours[i] >= ulCtFacets) && (it->_aulNeighbours[i] < ULONG_MAX)) {
+                return false;
+            }
+        }
     }
-  }
 
-  return true;
+    return true;
 }
 
 std::vector<unsigned long> MeshEvalRangeFacet::GetIndices() const
 {
-  std::vector<unsigned long> aInds;
-  const MeshFacetArray& rFaces = _rclMesh.GetFacets();
-  unsigned long ulCtFacets = rFaces.size();
+    std::vector<unsigned long> aInds;
+    const MeshFacetArray& rFaces = _rclMesh.GetFacets();
+    unsigned long ulCtFacets = rFaces.size();
 
-  unsigned long ind=0;
-  for ( MeshFacetArray::_TConstIterator it = rFaces.begin(); it != rFaces.end(); ++it, ind++ )
-  {
-    for ( int i = 0; i < 3; i++ ) {
-      if ((it->_aulNeighbours[i] >= ulCtFacets) && (it->_aulNeighbours[i] < ULONG_MAX)) {
-        aInds.push_back(ind);
-        break;
-      }
+    unsigned long ind=0;
+    for (MeshFacetArray::_TConstIterator it = rFaces.begin(); it != rFaces.end(); ++it, ind++) {
+        for (int i = 0; i < 3; i++) {
+            if ((it->_aulNeighbours[i] >= ulCtFacets) && (it->_aulNeighbours[i] < ULONG_MAX)) {
+                aInds.push_back(ind);
+                break;
+            }
+        }
     }
-  }
 
-  return aInds;
+    return aInds;
 }
 
 bool MeshFixRangeFacet::Fixup()
 {
-  return false;
+    _rclMesh.RebuildNeighbours();
+    return true;
 }
 
 // ----------------------------------------------------------------------
 
 bool MeshEvalRangePoint::Evaluate()
 {
-  const MeshFacetArray& rFaces = _rclMesh.GetFacets();
-  unsigned long ulCtPoints = _rclMesh.CountPoints();
+    const MeshFacetArray& rFaces = _rclMesh.GetFacets();
+    unsigned long ulCtPoints = _rclMesh.CountPoints();
 
-  for ( MeshFacetArray::_TConstIterator it = rFaces.begin(); it != rFaces.end(); ++it ) {
-    if (std::find_if(it->_aulPoints, it->_aulPoints + 3, std::bind2nd(std::greater_equal<unsigned long>(), ulCtPoints)) < it->_aulPoints + 3)
-      return false;
-  }
+    for (MeshFacetArray::_TConstIterator it = rFaces.begin(); it != rFaces.end(); ++it) {
+        if (std::find_if(it->_aulPoints, it->_aulPoints + 3, std::bind2nd(std::greater_equal<unsigned long>(), ulCtPoints)) < it->_aulPoints + 3)
+            return false;
+    }
 
-  return true;
+    return true;
 }
 
 std::vector<unsigned long> MeshEvalRangePoint::GetIndices() const
 {
-  std::vector<unsigned long> aInds;
-  const MeshFacetArray& rFaces = _rclMesh.GetFacets();
-  unsigned long ulCtPoints = _rclMesh.CountPoints();
+    std::vector<unsigned long> aInds;
+    const MeshFacetArray& rFaces = _rclMesh.GetFacets();
+    unsigned long ulCtPoints = _rclMesh.CountPoints();
 
-  unsigned long ind=0;
-  for ( MeshFacetArray::_TConstIterator it = rFaces.begin(); it != rFaces.end(); ++it, ind++ )
-  {
-    if (std::find_if(it->_aulPoints, it->_aulPoints + 3, std::bind2nd(std::greater_equal<unsigned long>(), ulCtPoints)) < it->_aulPoints + 3)
-      aInds.push_back(ind);
-  }
+    unsigned long ind=0;
+    for (MeshFacetArray::_TConstIterator it = rFaces.begin(); it != rFaces.end(); ++it, ind++) {
+        if (std::find_if(it->_aulPoints, it->_aulPoints + 3, std::bind2nd(std::greater_equal<unsigned long>(), ulCtPoints)) < it->_aulPoints + 3)
+            aInds.push_back(ind);
+    }
 
-  return aInds;
+    return aInds;
 }
 
 bool MeshFixRangePoint::Fixup()
 {
-  return false;
+    MeshEvalRangePoint eval(_rclMesh);
+    if (_rclMesh.CountPoints() == 0) {
+        // if no points are there but facets then the whole mesh can be cleared
+        _rclMesh.Clear();
+    }
+    else {
+        // facets with point indices out of range cannot be directly deleted because
+        // 'DeleteFacets' will segfault. But setting all point indices to 0 works.
+        std::vector<unsigned long> invalid = eval.GetIndices();
+        if (!invalid.empty()) {
+            const MeshFacetArray& rFaces = _rclMesh.GetFacets();
+            for (std::vector<unsigned long>::iterator it = invalid.begin(); it != invalid.end(); ++it) {
+                MeshFacet& face = const_cast<MeshFacet&>(rFaces[*it]);
+                face._aulPoints[0] = 0;
+                face._aulPoints[1] = 0;
+                face._aulPoints[2] = 0;
+            }
+
+            _rclMesh.DeleteFacets(invalid);
+        }
+    }
+    return true;
 }
 
 // ----------------------------------------------------------------------

src/Mod/Mesh/App/Core/Elements.cpp

@@ -349,9 +349,9 @@ bool MeshGeomFacet::Weights(const Base::Vector3f& rclP, float& w0, float& w1, fl
   return fabs(w0+w1+w2-1.0f)<0.001f;
 }
 
-void MeshGeomFacet::ProjectPointToPlane (Base::Vector3f &rclPoint) const
+void MeshGeomFacet::ProjectPointToPlane (const Base::Vector3f &rclPoint, Base::Vector3f &rclProj) const
 {
-  rclPoint.ProjectToPlane(_aclPoints[0], GetNormal());
+  rclPoint.ProjectToPlane(_aclPoints[0], GetNormal(), rclProj);
 }
 
 void MeshGeomFacet::ProjectFacetToPlane (MeshGeomFacet &rclFacet) const

src/Mod/Mesh/App/Core/Elements.h

@@ -349,7 +349,7 @@ class MeshExport MeshGeomFacet
   /**
    * Calculates the projection of a point onto the plane defined by the triangle.
    */
-  void ProjectPointToPlane (Base::Vector3f &rclPoint) const;
+  void ProjectPointToPlane (const Base::Vector3f &rclPoint, Base::Vector3f &rclProj) const;
   /**
    * Calculates the projection of a facet onto the plane defined by the triangle.
    */
@@ -592,6 +592,58 @@ class MeshExport MeshFacetArray: public TMeshFacetArray
     void DecrementIndices (unsigned long ulIndex);
 };
 
+/**
+ * MeshPointModifier is a helper class that allows to modify the
+ * point array of a mesh kernel but with limited access.
+ */
+class MeshExport MeshPointModifier
+{
+public:
+    MeshPointModifier(MeshPointArray& points)
+        : rPoints(points)
+    {
+    }
+
+    MeshPointModifier(const MeshPointModifier& c)
+        : rPoints(c.rPoints)
+    {
+    }
+
+private:
+    MeshPointArray& rPoints;
+};
+
+/**
+ * MeshFacetModifier is a helper class that allows to modify the
+ * facet array of a mesh kernel but with limited access.
+ */
+class MeshExport MeshFacetModifier
+{
+public:
+    MeshFacetModifier(MeshFacetArray& facets)
+        : rFacets(facets)
+    {
+    }
+
+    MeshFacetModifier(const MeshFacetModifier& c)
+        : rFacets(c.rFacets)
+    {
+    }
+
+    /**
+     * Replaces the index of the corner point of the facet at position \a pos
+     * that is equal to \a old by \a now. If the facet does not have a corner
+     * point with this index nothing happens.
+     */
+    void Transpose(unsigned long pos, unsigned long old, unsigned long now)
+    {
+        rFacets[pos].Transpose(old, now);
+    }
+
+private:
+    MeshFacetArray& rFacets;
+};
+
 inline MeshPoint::MeshPoint (const Base::Vector3f &rclPt)
 #ifdef _MSC_VER
 : Vector3f(rclPt),

src/Mod/Mesh/App/Core/MeshKernel.cpp

@@ -43,6 +43,7 @@
 #include "Evaluation.h"
 #include "Builder.h"
 #include "Smoothing.h"
+#include "MeshIO.h"
 
 using namespace MeshCore;
 
@@ -385,6 +386,12 @@ void MeshKernel::Merge(const MeshPointArray& rPoints, const MeshFacetArray& rFac
     RebuildNeighbours(countFacets);
 }
 
+void MeshKernel::Cleanup()
+{
+    MeshCleanup meshCleanup(_aclPointArray, _aclFacetArray);
+    meshCleanup.RemoveInvalids();
+}
+
 void MeshKernel::Clear (void)
 {
     _aclPointArray.clear();