Developer Documentation
TriangleMesh.cc
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41 
50 //== INCLUDES =================================================================
51 
53 
54 #include <ACG/Scenegraph/StatusNodesT.hh>
55 #include <ACG/QtScenegraph/QtTranslationManipulatorNode.hh>
56 
57 
58 TriMeshObject::TriMeshObject(const TriMeshObject& _object) : MeshObject< TriMesh >(_object) {
59 
60 }
61 
62 
63 TriMeshObject::TriMeshObject(DataType _typeId) : MeshObject< TriMesh >(_typeId) {
64 
65 }
66 
67 
69 
70 }
71 
73  TriMeshObject* object = new TriMeshObject(*this );
74  return object;
75 }
76 
78 ACG::Vec3d TriMeshObject::refinePick(ACG::SceneGraph::PickTarget _pickTarget, const ACG::Vec3d _hitPoint, const ACG::Vec3d _start , const ACG::Vec3d _dir, const unsigned int _targetIdx ) {
79  if ( _pickTarget == ACG::SceneGraph::PICK_FACE) {
80 
81  // get picked face handle
82  TriMesh::FaceHandle fh = mesh()->face_handle(_targetIdx);
83 
84  TriMesh::FaceVertexIter fv_it = mesh()->fv_begin(fh);
85 
86  // Get vertices of the face
87  ACG::Vec3d p1 = mesh()->point(*fv_it);
88  ++fv_it;
89 
90  ACG::Vec3d p2 = mesh()->point(*fv_it);
91  ++fv_it;
92 
93  ACG::Vec3d p3 = mesh()->point(*fv_it);
94  ++fv_it;
95 
96  ACG::Vec3d hitpointNew = _hitPoint;
97 
98  TriMesh::Scalar t,u,v;
99  if ( ACG::Geometry::triangleIntersection( _start, _dir, p1 , p2 , p3 , t , u , v) ) {
100  hitpointNew = _start + t * _dir;
101  }
102 
103  return hitpointNew;
104  }
105 
106  if ( _pickTarget == ACG::SceneGraph::PICK_EDGE) {
107  // get picked edge handle
108  TriMesh::EdgeHandle eh = mesh()->edge_handle(_targetIdx);
109  if(eh.is_valid())
110  {
111  TriMesh::HalfedgeHandle heh = mesh()->halfedge_handle(eh,0);
112 
113  //get vertices of the edge
114  TriMesh::VertexHandle vhbegin = mesh()->to_vertex_handle(heh);
115  TriMesh::VertexHandle vhend = mesh()->from_vertex_handle(heh);
116  ACG::Vec3d edgeStart = mesh()->point(vhbegin);
117  ACG::Vec3d edgeEnd = mesh()->point(vhend);
118 
119  //retrieve the point on the edge that is closest to the backprojected hitpoint
120  ACG::Vec3d hitPointNew;
121  ACG::Geometry::distPointLineSquared(_hitPoint,edgeStart,edgeEnd,&hitPointNew);
122 
123 
124  return hitPointNew;
125  }
126  }
127 
128  if ( _pickTarget == ACG::SceneGraph::PICK_VERTEX) {
129  // get picked vertex handle
130  TriMesh::VertexHandle vh = mesh()->vertex_handle(_targetIdx);
131  if(vh.is_valid())
132  {
133  ACG::Vec3d hitpointNew = mesh()->point(vh);
134 
135  //just return the vertex position
136  return hitpointNew;
137  }
138  }
139 
140  return _hitPoint;
141 }
142 
143 
144 //=============================================================================
145 
Vec::value_type distPointLineSquared(const Vec &_p, const Vec &_v0, const Vec &_v1, Vec *_min_v)
squared distance from point _p to line segment (_v0,_v1)
Definition: Algorithms.cc:290
picks edges (may not be implemented for all nodes)
Definition: PickTarget.hh:80
picks faces (should be implemented for all nodes)
Definition: PickTarget.hh:78
Kernel::FaceVertexIter FaceVertexIter
Circulator.
Definition: PolyMeshT.hh:167
TriMeshObject(const TriMeshObject &_object)
copy constructor
Definition: TriangleMesh.cc:58
virtual ~TriMeshObject()
destructor
Definition: TriangleMesh.cc:68
bool triangleIntersection(const Vec &_o, const Vec &_dir, const Vec &_v0, const Vec &_v1, const Vec &_v2, typename Vec::value_type &_t, typename Vec::value_type &_u, typename Vec::value_type &_v)
Intersect a ray and a triangle.
Definition: Algorithms.cc:1307
Predefined datatypes.
Definition: DataTypes.hh:83
TriMesh * mesh()
return a pointer to the mesh
PickTarget
What target to use for picking.
Definition: PickTarget.hh:73
ACG::Vec3d refinePick(ACG::SceneGraph::PickTarget _pickTarget, const ACG::Vec3d _hitPoint, const ACG::Vec3d _start, const ACG::Vec3d _dir, const unsigned int _targetIdx)
Refine picking on triangle meshes.
Definition: TriangleMesh.cc:78
picks verices (may not be implemented for all nodes)
Definition: PickTarget.hh:82
Type for a MeshObject containing a triangle mesh.
Definition: TriangleMesh.hh:67
Kernel::Scalar Scalar
Scalar type.
Definition: PolyMeshT.hh:110
BaseObject * copy()
Definition: TriangleMesh.cc:72
Kernel::VertexHandle VertexHandle
Handle for referencing the corresponding item.
Definition: PolyMeshT.hh:136