Medical/helpers/VolumeMarchingCubes.h

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// Simple Marching Cubes for VolumeViz

//
// This class is part of the Open Inventor Medical Edition utility library.
//
// The medical utility classes are provided as a prebuilt library named
// "fei.inventor.Medical", that can be used directly in an Open Inventor
// application. The classes in the prebuilt library are documented and
// supported by FEI. These classes are also provided as source code.
//
// Please see $OIVHOME/include/Medical/InventorMedical.h for the full text.
//

#ifndef _VOLUME_MARCHING_CUBES_
#define _VOLUME_MARCHING_CUBES_

#include <Medical/InventorMedical.h>

#include <Inventor/nodes/SoTriangleSet.h>
#include <VolumeViz/nodes/SoVolumeData.h>
#include <LDM/SoLDMTileID.h>
#include <LDM/SoLDMDataAccess.h>

#include <vector>

class  SoLDMTopoOctree;


class INVENTORMEDICAL_API VolumeMarchingCubes
{
public:
  VolumeMarchingCubes();

  ~VolumeMarchingCubes();

  SoTriangleSet* getIsosurface( const SoVolumeData& volume, float isovalue );

  size_t getNumTriangles() const;

  float getIsovalue() const;

private:
  void marchVolume();

  void marchTile( SbVec3i32 tileDim, SbVec3f tileMin, SbVec3f tileMax, void* tileData );

  int marchCube( SbVec3f& corner, SbVec3f& size, float values[8], float isoval, SbVec3f vertices[15] );

  float getVoxelValue( int i, int j, int k);

  // Volume properties
  SbVec3i32 m_voldim;     // IJK dimensions
  SbBox3f   m_volext;     // XYZ extent
  SbVec3i32 m_tiledim;    // IJK dimensions
  SbVec3f   m_tileSize;   // XYZ size
  SbVec3f   m_voxelSize;  // XYZ size
  unsigned int        m_voxelBytes;
  SoDataSet::DataType m_voxelType;

  // Stuff to handle multiple tiles
  SoVolumeData*    m_volData;
  SoLDMDataAccess::DataInfo* m_dataInfo;  // Data for current locked tile (if any).
  SbVec3i32 m_tileMin;
  SbVec3i32 m_tileMax;

  // Only used during extraction.  Should be hidden in an impl class.
  std::vector<SbVec3f> m_vertices;

  // Other
  float m_isoValue;
  int   m_resolution;
  size_t m_numTriangles;
};

#endif

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Open Inventor Toolkit reference manual, generated on 12 Feb 2024
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