vtkOBBTree.h

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

  Program:   Visualization Toolkit
  Module:    vtkOBBTree.h

  Copyright (c) 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 "vtkFiltersGeneralModule.h" // For export macro
#include "vtkAbstractCellLocator.h"

class vtkMatrix4x4;

// Special class defines node for the OBB tree
//

//
class VTKFILTERSGENERAL_EXPORT vtkOBBNode { //;prevent man page generation
public:
  vtkOBBNode();
  ~vtkOBBNode();

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

private:
  vtkOBBNode(const vtkOBBNode& other) = delete;
  vtkOBBNode& operator=(const vtkOBBNode& rhs) = delete;
};

//

class VTKFILTERSGENERAL_EXPORT vtkOBBTree : public vtkAbstractCellLocator
{
public:
  vtkTypeMacro(vtkOBBTree,vtkAbstractCellLocator);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  static vtkOBBTree *New();

  // Re-use any superclass signatures that we don't override.
  using vtkAbstractCellLocator::IntersectWithLine;

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

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

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

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

  int InsideOrOutside(const double point[3]);

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

  int LineIntersectsNode( vtkOBBNode *pA, const double b0[3], const double b1[3] );

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

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


  void FreeSearchStructure() override;
  void BuildLocator() override;

  void GenerateRepresentation(int level, vtkPolyData *pd) override;

protected:
  vtkOBBTree();
  ~vtkOBBTree() override;

  // 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, double corner[3], double max[3],
                       double mid[3], double min[3], double size[3]);

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

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

private:
  vtkOBBTree(const vtkOBBTree&) = delete;
  void operator=(const vtkOBBTree&) = delete;
};

#endif