1 // SMESH SMESH_Octree : global Octree implementation
3 // Copyright (C) 2003 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
4 // CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
6 // This library is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU Lesser General Public
8 // License as published by the Free Software Foundation; either
9 // version 2.1 of the License.
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // Lesser General Public License for more details.
16 // You should have received a copy of the GNU Lesser General Public
17 // License along with this library; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
24 // File : SMESH_Octree.cxx
25 // Created : Tue Jan 16 16:00:00 2007
26 // Author : Nicolas Geimer & Aurélien Motteux(OCC)
29 #include "SMESH_Octree.hxx"
31 //===========================================================================
33 * \brief SMESH_Octree Constructor
34 * \param maxLevel - The level max the octree can reach (If <0 unlimited)
36 //===========================================================================
37 SMESH_Octree::SMESH_Octree (const int maxLevel, const double minBoxSize):
41 myMinBoxSize(minBoxSize),
44 myBox = new Bnd_B3d();
47 //======================================
49 * \brief SMESH_Octree Destructor
51 //======================================
52 SMESH_Octree::~SMESH_Octree ()
54 if(myChildren != NULL)
58 for(int i = 0; i<8; i++)
66 //===========================================================================
68 * \brief Set the bounding box of the Octree
69 * \param box - 3d Bounding Box of the Octree
71 //===========================================================================
72 void SMESH_Octree::setBox(const Bnd_B3d* box)
75 // myBox=new Bnd_B3d(*box);
79 //===========================================================================
81 * \brief Set box to the 3d Bounding Box of the Octree
82 * \param box - Set box to the 3d Bounding Box of the Octree
84 //===========================================================================
85 void SMESH_Octree::getBox(Bnd_B3d& box)
89 // box = new Bnd_B3d (*myBox);
93 //===========================================================================
95 * \brief Set the max level of the Octree
96 * \param maxLevel - The level max the octree can reach (If <0 unlimited)
98 //===========================================================================
99 void SMESH_Octree::setMaxLevel(const int maxLevel)
100 {myMaxLevel = maxLevel;}
103 //===========================================================================
105 * \brief Compute the bigger dimension of the box
106 * \param box - 3d Box
107 * \retval double - bigger dimension of the box
109 //===========================================================================
110 double SMESH_Octree::maxSize(const Bnd_B3d* box)
114 gp_XYZ min = box->CornerMin();
115 gp_XYZ max = box->CornerMax();
116 gp_XYZ Size = (max - min);
117 double returnVal = (Size.X()>Size.Y())?Size.X():Size.Y();
118 return (returnVal>Size.Z())?returnVal:Size.Z();
121 //=============================
123 * \brief Compute the Octree
125 //=============================
126 void SMESH_Octree::Compute()
128 // As soon as the Octree is a Leaf, I stop building his children
133 //=================================================================
135 * \brief Build the 8 children boxes and call buildChildrenData()
137 //=================================================================
138 void SMESH_Octree::buildChildren()
140 myChildren = new SMESH_Octree*[8];
142 gp_XYZ min = myBox->CornerMin();
143 gp_XYZ max = myBox->CornerMax();
144 gp_XYZ HSize = (max - min)/2.;
145 gp_XYZ mid = min + HSize;
146 gp_XYZ childHsize = HSize/2.;
148 Standard_Real XminChild, YminChild, ZminChild;
151 for (int i =0; i<8; i++)
153 // We build the eight boxes, we need 2 points to do that.
155 // In binary, we can write i from 0 to 7
157 // 5 is 101, it corresponds here in coordinates to ZYX
158 // If coordinate is 0 in Y-> box from Ymin to Ymid
159 // If coordinate is 1 in Y-> box from Ymid to Ymax
160 // Same scheme for X and Z
161 // I need the minChild to build the Bnd_B3d box.
163 XminChild= (i%2==0)?min.X():mid.X();
164 YminChild= ((i%4)/2==0)?min.Y():mid.Y();
165 ZminChild= (i<4)?min.Z():mid.Z();
166 minChild.SetCoord(XminChild, YminChild, ZminChild);
168 box = new Bnd_B3d(minChild+childHsize,childHsize);
169 // The child is of the same type than its father (For instance, a SMESH_OctreeNode)
170 // We allocate the memory we need fot the child
171 myChildren[i] = allocateOctreeChild();
172 // and we assign to him its box.
173 myChildren[i]->setBox(box);
177 // After building the 8 boxes, we put the data into the children..
180 //After we pass to the next level of the Octree
181 for (int i =0; i<8; i++)
182 myChildren[i]->Compute();