- decimater (incremental & mc) doesn't require normals anymore

- mod normalFlipping & normalDeviation computes normals, if mesh hasn't normals
- add 2 decimater unittest (decimating with normalFlipping and initialize all modules)

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@1049 fdac6126-5c0c-442c-9429-916003d36597

src/OpenMesh/Tools/Decimater/BaseDecimaterT.cc

@@ -72,7 +72,7 @@ BaseDecimaterT<Mesh>::BaseDecimaterT(Mesh& _mesh) :
   mesh_.request_vertex_status();
   mesh_.request_edge_status();
   mesh_.request_face_status();
-  mesh_.request_face_normals();
+
 }
 
 //-----------------------------------------------------------------------------
@@ -83,7 +83,6 @@ BaseDecimaterT<Mesh>::~BaseDecimaterT() {
   mesh_.release_vertex_status();
   mesh_.release_edge_status();
   mesh_.release_face_status();
-  mesh_.release_face_normals();
 
   // dispose of modules
   {

src/OpenMesh/Tools/Decimater/DecimaterT.cc

@@ -172,6 +172,8 @@ size_t DecimaterT<Mesh>::decimate(size_t _n_collapses) {
       heap_vertex(*v_it);
   }
 
+  const bool update_normals = mesh_.has_face_normals();
+
   // process heap
   while ((!heap_->empty()) && (n_collapses < _n_collapses)) {
     // get 1st heap entry
@@ -196,11 +198,14 @@ size_t DecimaterT<Mesh>::decimate(size_t _n_collapses) {
     mesh_.collapse(v0v1);
     ++n_collapses;
 
-    // update triangle normals
-    vf_it = mesh_.vf_iter(ci.v1);
-    for (; vf_it.is_valid(); ++vf_it)
-      if (!mesh_.status(*vf_it).deleted())
-        mesh_.set_normal(*vf_it, mesh_.calc_face_normal(*vf_it));
+    if (update_normals)
+    {
+      // update triangle normals
+      vf_it = mesh_.vf_iter(ci.v1);
+      for (; vf_it.is_valid(); ++vf_it)
+        if (!mesh_.status(*vf_it).deleted())
+          mesh_.set_normal(*vf_it, mesh_.calc_face_normal(*vf_it));
+    }
 
     // post-process collapse
     this->postprocess_collapse(ci);
@@ -258,6 +263,8 @@ size_t DecimaterT<Mesh>::decimate_to_faces(size_t _nv, size_t _nf) {
       heap_vertex(*v_it);
   }
 
+  const bool update_normals = mesh_.has_face_normals();
+
   // process heap
   while ((!heap_->empty()) && (_nv < nv) && (_nf < nf)) {
     // get 1st heap entry
@@ -293,10 +300,13 @@ size_t DecimaterT<Mesh>::decimate_to_faces(size_t _nv, size_t _nf) {
     mesh_.collapse(v0v1);
 
     // update triangle normals
-    vf_it = mesh_.vf_iter(ci.v1);
-    for (; vf_it.is_valid(); ++vf_it)
-      if (!mesh_.status(*vf_it).deleted())
-        mesh_.set_normal(*vf_it, mesh_.calc_face_normal(*vf_it));
+    if (update_normals)
+    {
+      vf_it = mesh_.vf_iter(ci.v1);
+      for (; vf_it.is_valid(); ++vf_it)
+        if (!mesh_.status(*vf_it).deleted())
+          mesh_.set_normal(*vf_it, mesh_.calc_face_normal(*vf_it));
+    }
 
     // post-process collapse
     this->postprocess_collapse(ci);

src/OpenMesh/Tools/Decimater/McDecimaterT.cc

@@ -81,7 +81,6 @@ McDecimaterT<Mesh>::McDecimaterT(Mesh& _mesh) :
   mesh_.request_halfedge_status();
   mesh_.request_edge_status();
   mesh_.request_face_status();
-  mesh_.request_face_normals();
 
 }
 
@@ -94,7 +93,6 @@ McDecimaterT<Mesh>::~McDecimaterT() {
   mesh_.release_edge_status();
   mesh_.release_halfedge_status();
   mesh_.release_face_status();
-  mesh_.release_face_normals();
 
 }
 
@@ -118,6 +116,8 @@ size_t McDecimaterT<Mesh>::decimate(size_t _n_collapses) {
   RandomNumberGenerator randGen(mesh_.n_halfedges());
 #endif
 
+  const bool update_normals = mesh_.has_face_normals();
+
   while ( n_collapses <  _n_collapses) {
 
     if (noCollapses > 20) {
@@ -187,10 +187,13 @@ size_t McDecimaterT<Mesh>::decimate(size_t _n_collapses) {
       collapsesUnchanged = false;
 
       // update triangle normals
-      typename Mesh::VertexFaceIter vf_it = mesh_.vf_iter(ci.v1);
-      for (; vf_it.is_valid(); ++vf_it)
-        if (!mesh_.status(*vf_it).deleted())
-          mesh_.set_normal(*vf_it, mesh_.calc_face_normal(*vf_it));
+      if (update_normals)
+      {
+        typename Mesh::VertexFaceIter vf_it = mesh_.vf_iter(ci.v1);
+        for (; vf_it.is_valid(); ++vf_it)
+          if (!mesh_.status(*vf_it).deleted())
+            mesh_.set_normal(*vf_it, mesh_.calc_face_normal(*vf_it));
+      }
 
       // post-process collapse
       this->postprocess_collapse(ci);
@@ -240,6 +243,8 @@ size_t McDecimaterT<Mesh>::decimate_to_faces(size_t _nv, size_t _nf) {
   RandomNumberGenerator randGen(mesh_.n_halfedges());
 #endif
 
+  const bool update_normals = mesh_.has_face_normals();
+
   while ((_nv < nv) && (_nf < nf)) {
 
     if (noCollapses > 20) {
@@ -320,11 +325,14 @@ size_t McDecimaterT<Mesh>::decimate_to_faces(size_t _nv, size_t _nf) {
       noCollapses = 0;
       collapsesUnchanged = false;
 
-      // update triangle normals
-      typename Mesh::VertexFaceIter vf_it = mesh_.vf_iter(ci.v1);
-      for (; vf_it.is_valid(); ++vf_it)
-        if (!mesh_.status(*vf_it).deleted())
-          mesh_.set_normal(*vf_it, mesh_.calc_face_normal(*vf_it));
+      if (update_normals)
+      {
+        // update triangle normals
+        typename Mesh::VertexFaceIter vf_it = mesh_.vf_iter(ci.v1);
+        for (; vf_it.is_valid(); ++vf_it)
+          if (!mesh_.status(*vf_it).deleted())
+            mesh_.set_normal(*vf_it, mesh_.calc_face_normal(*vf_it));
+      }
 
       // post-process collapse
       this->postprocess_collapse(ci);

src/OpenMesh/Tools/Decimater/ModNormalDeviationT.hh

@@ -108,12 +108,22 @@ public:
   {
     set_normal_deviation(_max_dev);
     mesh_.add_property(normal_cones_);
+
+    const bool mesh_has_normals = _mesh.has_face_normals();
+    _mesh.request_face_normals();
+
+    if (!mesh_has_normals)
+    {
+      std::cerr << "Mesh has no face normals. Compute them automatically." << std::endl;
+      _mesh.update_face_normals();
+    }
   }
 
 
   /// Destructor
   ~ModNormalDeviationT() {
     mesh_.remove_property(normal_cones_);
+    mesh_.release_face_normals();
   }
 
 

src/OpenMesh/Tools/Decimater/ModNormalFlippingT.hh

@@ -87,11 +87,21 @@ public:
   ModNormalFlippingT( MeshT &_mesh) : Base(_mesh, true)
   {
     set_max_normal_deviation( 90.0f );
+    const bool mesh_has_normals = _mesh.has_face_normals();
+    _mesh.request_face_normals();
+
+    if (!mesh_has_normals)
+    {
+      std::cerr << "Mesh has no face normals. Compute them automatically." << std::endl;
+      _mesh.update_face_normals();
+    }
   }
 
 
   ~ModNormalFlippingT()
-  { }
+  {
+    Base::mesh().release_face_normals();
+  }
 
 
 public: