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Graphics/vtkOBBTree.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkOBBTree.h,v $
  Language:  C++

  Copyright (c) 1993-2002 Ken Martin, Will Schroeder, Bill Lorensen 
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef __vtkOBBTree_h
#define __vtkOBBTree_h

#include "vtkCellLocator.h"

class vtkMatrix4x4;

// Special class defines node for the OBB tree
//
//BTX
//
class vtkOBBNode { //;prevent man page generation
public:
  vtkOBBNode();
  ~vtkOBBNode();

  float Corner[3]; //center point of this node
  float Axes[3][3]; //the axes defining the OBB - ordered from long->short
  vtkOBBNode *Parent; //parent node; NULL if root
  vtkOBBNode **Kids; //two children of this node; NULL if leaf
  vtkIdList *Cells; //list of cells in node
  void DebugPrintTree( int level, double *leaf_vol, int *minCells,
                       int *maxCells );
};
//ETX
//

class VTK_GRAPHICS_EXPORT vtkOBBTree : public vtkCellLocator
{
public:
  vtkTypeRevisionMacro(vtkOBBTree,vtkCellLocator);

  static vtkOBBTree *New();


  void ComputeOBB(vtkPoints *pts, float corner[3], float max[3], 
                  float mid[3], float min[3], float size[3]);


  void ComputeOBB(vtkDataSet *input, float corner[3], float max[3],
                  float mid[3], float min[3], float size[3]);

  int InsideOrOutside(const float point[3]);


  int IntersectWithLine(const float a0[3], const float a1[3],
                        vtkPoints *points, vtkIdList *cellIds);


  int IntersectWithLine(float a0[3], float a1[3], float tol,
                        float& t, float x[3], float pcoords[3],
                        int &subId);

  int IntersectWithLine(float a0[3], float a1[3], float tol,
                        float& t, float x[3], float pcoords[3],
                        int &subId, vtkIdType &cellId);
  
  int IntersectWithLine(float a0[3], float a1[3], float tol,
                        float& t, float x[3], float pcoords[3],
                        int &subId, vtkIdType &cellId, vtkGenericCell *cell);

  //BTX


  int DisjointOBBNodes( vtkOBBNode *nodeA, vtkOBBNode *nodeB,
                        vtkMatrix4x4 *XformBtoA );

  int LineIntersectsNode( vtkOBBNode *pA, float B0[3], float B1[3] );


  int TriangleIntersectsNode( vtkOBBNode *pA,
                              float p0[3], float p1[3],
                              float p2[3], vtkMatrix4x4 *XformBtoA );


  int IntersectWithOBBTree( vtkOBBTree *OBBTreeB, vtkMatrix4x4 *XformBtoA,
                            int(*function)( vtkOBBNode *nodeA,
                                            vtkOBBNode *nodeB,
                                            vtkMatrix4x4 *Xform,
                                            void *arg ),
                            void *data_arg );
  //ETX

  /*! Satisfy locator's abstract interface, see vtkLocator. */
  void FreeSearchStructure();
  void BuildLocator();

  void GenerateRepresentation(int level, vtkPolyData *pd);

  //BTX
protected:
  vtkOBBTree();
  ~vtkOBBTree();

  // Compute an OBB from the list of cells given.  This used to be
  // public but should not have been.  A public call has been added
  // so that the functionality can be accessed.
  void ComputeOBB(vtkIdList *cells, float corner[3], float max[3], 
                       float mid[3], float min[3], float size[3]);

  vtkOBBNode *Tree;
  void BuildTree(vtkIdList *cells, vtkOBBNode *parent, int level);
  vtkPoints *PointsList;
  int *InsertedPoints;
  int OBBCount;
  int DeepestLevel;

  void DeleteTree(vtkOBBNode *OBBptr);
  void GeneratePolygons(vtkOBBNode *OBBptr, int level, int repLevel, 
                        vtkPoints* pts, vtkCellArray *polys);

  //ETX
private:
  vtkOBBTree(const vtkOBBTree&);  // Not implemented.
  void operator=(const vtkOBBTree&);  // Not implemented.
};

#endif

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