From 6d3efcbafd17d3c2f00b28042f0889680e14a158 Mon Sep 17 00:00:00 2001
From: Martin Heistermann <git@mheistermann.de>
Date: Sat, 13 Jan 2018 02:48:31 +0100
Subject: [PATCH] New feature: create hexahedral cube

---
 PrimitivesGenerator.cc | 65 +++++++++++++++++++++++++++++++++++++++++-
 PrimitivesGenerator.hh |  7 +++++
 2 files changed, 71 insertions(+), 1 deletion(-)

diff --git a/PrimitivesGenerator.cc b/PrimitivesGenerator.cc
index 55193a4..dad4548 100644
--- a/PrimitivesGenerator.cc
+++ b/PrimitivesGenerator.cc
@@ -55,6 +55,10 @@
 #include "TetrahedralCuboidGenerator.hh"
 #endif
 
+#ifdef ENABLE_HEXAHEDRALMESH_SUPPORT
+#include <ObjectTypes/HexahedralMesh/HexahedralMesh.hh>
+#endif
+
 #ifdef ENABLE_BSPLINECURVE_SUPPORT
 #include <ObjectTypes/BSplineCurve/BSplineCurve.hh>
 #endif
@@ -159,6 +163,12 @@ void PrimitivesGeneratorPlugin::initializePlugin()
                           QString("Position,Lengths,Count,Count,Count").split(","),
                           QString("Center position,Length of each side,Number of units in x-axis,Number of units in y-axis,Number of units in z-axis").split(","));
 #endif
+#ifdef ENABLE_HEXAHEDRALMESH_SUPPORT
+  emit setSlotDescription("addHexahedralCube(Vector,double)",
+                          tr("Generates a hexahedral mesh of a cube (ObjectId is returned)"),
+                          QString("Position,Length").split(","),
+                          QString("Center position,Length of each edge").split(","));
+#endif
 
 }
 
@@ -230,6 +240,13 @@ void PrimitivesGeneratorPlugin::pluginsInitialized() {
     action = primitivesMenu_->addAction("Cuboid (Tetrahedral Mesh)"  ,this,SLOT(addTetrahedralCuboid()));
     action->setIcon(QIcon(OpenFlipper::Options::iconDirStr()+OpenFlipper::Options::dirSeparator()+"primitive_cube.png"));
     whatsThisGen.setWhatsThis(action,tr("Create a Tetrahedral Cuboid."), "Cuboid");
+#endif
+
+#ifdef ENABLE_HEXAHEDRALMESH_SUPPORT
+    action = primitivesMenu_->addAction("Cube (Hexahedral Mesh)"    ,this,SLOT(addHexahedralCube()));
+    action->setIcon(QIcon(OpenFlipper::Options::iconDirStr()+OpenFlipper::Options::dirSeparator()+"primitive_cube.png"));
+    whatsThisGen.setWhatsThis(action,tr("Create a Hexahedral Cube."), "Cube");
+
 #endif
   }
 }
@@ -276,11 +293,11 @@ int PrimitivesGeneratorPlugin::addPolyhedralMesh() {
         return -1;
     }
 
-
     return objectId;
 }
 #endif
 
+
 int PrimitivesGeneratorPlugin::addTetrahedron(const Vector& _position, const double _length) {
 
   int newObject = addTriMesh();
@@ -484,6 +501,52 @@ int PrimitivesGeneratorPlugin::addTetrahedralCuboid(const Vector& _position,
 
 #endif
 
+//========================================================================
+// Hexahedral Cube & Cuboid
+//========================================================================
+
+#ifdef ENABLE_HEXAHEDRALMESH_SUPPORT
+
+int PrimitivesGeneratorPlugin::addHexahedralCube(const Vector& _position, const double _length)
+{
+    int object_id;
+    emit addEmptyObject( DATA_HEXAHEDRAL_MESH, object_id);
+
+    HexahedralMeshObject* object;
+    if (!PluginFunctions::getObject(object_id, object) ) {
+        emit log(LOGERR, "Unable to create new HexahedralMesh object");
+        return -1;
+    }
+    object->setName( "HexCube " + QString::number(object_id) );
+
+    auto mesh =  object->mesh();
+    namespace OVM = OpenVolumeMesh;
+    std::vector<OVM::VertexHandle> vertices(8);
+
+    const double halfSize = 0.5*_length;
+    vertices[0] = mesh->add_vertex(Vector(-halfSize, -halfSize, halfSize)+_position);
+    vertices[1] = mesh->add_vertex(Vector( halfSize, -halfSize, halfSize)+_position);
+    vertices[2] = mesh->add_vertex(Vector( halfSize,  halfSize, halfSize)+_position);
+    vertices[3] = mesh->add_vertex(Vector(-halfSize,  halfSize, halfSize)+_position);
+    vertices[4] = mesh->add_vertex(Vector(-halfSize, -halfSize,-halfSize)+_position);
+    vertices[5] = mesh->add_vertex(Vector(-halfSize,  halfSize,-halfSize)+_position);
+    vertices[6] = mesh->add_vertex(Vector( halfSize,  halfSize,-halfSize)+_position);
+    vertices[7] = mesh->add_vertex(Vector( halfSize, -halfSize,-halfSize)+_position);
+
+    mesh->add_cell(vertices);
+
+    emit updatedObject(object_id, UPDATE_ALL);
+    emit createBackup(object_id, "Original Object");
+
+    object->setObjectDrawMode(ACG::SceneGraph::DrawModes::getDrawMode("Cells (flat shaded)"));
+
+    PluginFunctions::viewAll();
+
+    return object_id;
+}
+
+#endif
+
 //========================================================================
 // Cylinder
 //========================================================================
diff --git a/PrimitivesGenerator.hh b/PrimitivesGenerator.hh
index e0d55ff..c2879d9 100644
--- a/PrimitivesGenerator.hh
+++ b/PrimitivesGenerator.hh
@@ -173,6 +173,10 @@ public slots:
                            const unsigned int n_y = 5,
                            const unsigned int n_z = 10);
 #endif
+#ifdef ENABLE_HEXAHEDRALMESH_SUPPORT
+  int addHexahedralCube(const Vector& _position = Vector(0.0,0.0,0.0),
+                         const double _length = 2.0);
+#endif
 
 private:
   int addTriMesh();
@@ -182,6 +186,9 @@ private:
 
 #ifdef ENABLE_POLYHEDRALMESH_SUPPORT
   int addPolyhedralMesh();
+#endif
+#ifdef ENABLE_HEXAHEDRALMESH_SUPPORT
+  int addHexahedralMesh();
 #endif
   inline void add_face(int _vh1 , int _vh2, int _vh3);
 
-- 
2.22.0