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BOP_BSPTree.cpp

/**
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */
 
#include "BOP_BSPTree.h"
#include <vector>
#include <iostream>
using namespace std;

/**
 * Constructs a new BSP tree.
 */
00039 BOP_BSPTree::BOP_BSPTree()
{
      m_root = NULL;
      m_bspBB = NULL;
}

/**
 * Destroys a BSP tree.
 */
00048 BOP_BSPTree::~BOP_BSPTree()
{
      if (m_root!=NULL) delete m_root;
      if (m_bspBB!=NULL) delete m_bspBB;
}

/**
 * Adds all mesh faces to BSP tree.
 * @param mesh mesh to add.
 * @param facesList face list to add.
 */
00059 void BOP_BSPTree::addMesh(BOP_Mesh* mesh, BOP_Faces& facesList)
{
      for (BOP_IT_Faces it = facesList.begin(); it != facesList.end(); ++it) {
            addFace( mesh, *it );
      }
      
}

/**
 * Adds a new face into bsp tree.
 * @param mesh Input data for BSP tree.
 * @param face index to mesh face.
 */
00072 void BOP_BSPTree::addFace(BOP_Mesh* mesh, BOP_Face* face)
{
      addFace(mesh->getVertex(face->getVertex(0))->getPoint(),
                  mesh->getVertex(face->getVertex(1))->getPoint(),
                  mesh->getVertex(face->getVertex(2))->getPoint(),
                  face->getPlane());
}

/**
 * Adds new facee to the bsp-tree.
 * @param p1 first face point.
 * @param p2 second face point.
 * @param p3 third face point.
 * @param plane face plane.
 */
00087 void BOP_BSPTree::addFace(const MT_Point3& p1, 
                                      const MT_Point3& p2, 
                                      const MT_Point3& p3, 
                                      const MT_Plane3& plane)
{
      if (m_root == NULL)
            m_root = new BOP_BSPNode(plane);
      else
            m_root->addFace(p1,p2,p3,plane);

      // update bounding box
      m_bbox.add(p1);
      m_bbox.add(p2);
      m_bbox.add(p3);
}

/**
 * Tests face vs bsp-tree (returns where is the face respect bsp planes).
 * @param p1 first face triangle point.
 * @param p2 secons face triangle point.
 * @param p3 third face triangle point.
 * @param plane face plane.
 * @return BSP_IN, BSP_OUT or BSP_IN_OUT
 */
00111 BOP_TAG BOP_BSPTree::classifyFace(const MT_Point3& p1, 
                                                  const MT_Point3& p2, 
                                                  const MT_Point3& p3, 
                                                  const MT_Plane3& plane) const
{
      if ( m_root != NULL )
        return m_root->classifyFace(p1, p2, p3, plane);
      else
        return OUT;
}

/**
 * Filters a face using the BSP bounding infomation.
 * @param p1 first face triangle point.
 * @param p2 secons face triangle point.
 * @param p3 third face triangle point.
 * @param face face to test.
 * @return UNCLASSIFIED, BSP_IN, BSP_OUT or BSP_IN_OUT
 */
00130 BOP_TAG BOP_BSPTree::filterFace(const MT_Point3& p1, 
                                                const MT_Point3& p2, 
                                                const MT_Point3& p3, 
                                                BOP_Face* face)
{
      if ( m_bspBB != NULL ) {
            return m_bspBB->classifyFace(p1,p2,p3,face->getPlane());
      }
      else
            return UNCLASSIFIED;
}

/**
 * Tests face vs bsp-tree (returns where is the face respect bsp planes).
 * @param p1 first face triangle point.
 * @param p2 secons face triangle point.
 * @param p3 third face triangle point.
 * @param plane face plane.
 * @return BSP_IN, BSP_OUT or BSP_IN_OUT
 */
00150 BOP_TAG BOP_BSPTree::simplifiedClassifyFace(const MT_Point3& p1, 
                                                                  const MT_Point3& p2, 
                                                                  const MT_Point3& p3, 
                                                                  const MT_Plane3& plane) const
{
      if ( m_root != NULL )
        return m_root->simplifiedClassifyFace(p1, p2, p3, plane);
      else
        return OUT;
}

/**
 * Returns the deep of this BSP tree.
 * @return tree deep
 */
00165 unsigned int BOP_BSPTree::getDeep() const
{
      if ( m_root != NULL )
        return m_root->getDeep();
      else
        return 0;
}

/**
 * Computes the bounding BSP data.
 */
00176 void BOP_BSPTree::computeBox()
{
      if ( m_root != NULL ) {
            MT_Point3 p1(m_bbox.m_minX,m_bbox.m_minY,m_bbox.m_minZ);
            MT_Point3 p2(m_bbox.m_maxX,m_bbox.m_minY,m_bbox.m_minZ);
            MT_Point3 p3(m_bbox.m_maxX,m_bbox.m_maxY,m_bbox.m_minZ);
            MT_Point3 p4(m_bbox.m_minX,m_bbox.m_maxY,m_bbox.m_minZ);
            MT_Point3 p5(m_bbox.m_minX,m_bbox.m_minY,m_bbox.m_maxZ);
            MT_Point3 p6(m_bbox.m_maxX,m_bbox.m_minY,m_bbox.m_maxZ);
            MT_Point3 p7(m_bbox.m_maxX,m_bbox.m_maxY,m_bbox.m_maxZ);
            MT_Point3 p8(m_bbox.m_minX,m_bbox.m_maxY,m_bbox.m_maxZ);        
            
            MT_Plane3 plane1(p3,p2,p1);
            MT_Plane3 plane2(p5,p6,p7);
            MT_Plane3 plane3(p1,p2,p6);
            MT_Plane3 plane4(p8,p7,p3);
            MT_Plane3 plane5(p2,p3,p7);
            MT_Plane3 plane6(p1,p5,p8);
            
            BOP_BSPNode bsp(plane1);
            bsp.addFace(p5,p6,p7,plane2);
            bsp.addFace(p1,p2,p6,plane3);
            bsp.addFace(p8,p7,p3,plane4);
            bsp.addFace(p2,p3,p7,plane5);
            bsp.addFace(p1,p5,p8,plane6);
      }
}

/**
 * Prints debug information.
 */
00207 void BOP_BSPTree::print()
{
      if ( m_root != NULL )
            m_root->print( 0 );
}


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