103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
/*******************************************************************************
|
|
Copyright (c) 2005-2009 David Williams
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
|
|
3. This notice may not be removed or altered from any source
|
|
distribution.
|
|
*******************************************************************************/
|
|
|
|
#ifndef __PolyVox_SurfaceExtractor_H__
|
|
#define __PolyVox_SurfaceExtractor_H__
|
|
|
|
#include "PolyVoxForwardDeclarations.h"
|
|
#include "VolumeSampler.h"
|
|
|
|
#include "PolyVoxImpl/TypeDef.h"
|
|
|
|
namespace PolyVox
|
|
{
|
|
template <typename VoxelType>
|
|
class SurfaceExtractor
|
|
{
|
|
public:
|
|
SurfaceExtractor(Volume<VoxelType>* volData, Region region, SurfaceMesh<PositionMaterialNormal>* result);
|
|
|
|
void execute();
|
|
|
|
private:
|
|
//Compute the cell bitmask for a particular slice in z.
|
|
template<bool isPrevZAvail>
|
|
uint32_t computeBitmaskForSlice(const Array2DUint8& pPreviousBitmask, Array2DUint8& pCurrentBitmask);
|
|
|
|
//Compute the cell bitmask for a given cell.
|
|
template<bool isPrevXAvail, bool isPrevYAvail, bool isPrevZAvail>
|
|
void computeBitmaskForCell(const Array2DUint8& pPreviousBitmask, Array2DUint8& pCurrentBitmask);
|
|
|
|
//Use the cell bitmasks to generate all the vertices needed for that slice
|
|
void generateVerticesForSlice(const Array2DUint8& pCurrentBitmask,
|
|
Array2DInt32& m_pCurrentVertexIndicesX,
|
|
Array2DInt32& m_pCurrentVertexIndicesY,
|
|
Array2DInt32& m_pCurrentVertexIndicesZ);
|
|
|
|
Vector3DFloat computeCentralDifferenceGradient(const VolumeSampler<VoxelType>& volIter);
|
|
Vector3DFloat computeSobelGradient(const VolumeSampler<VoxelType>& volIter);
|
|
|
|
//Use the cell bitmasks to generate all the indices needed for that slice
|
|
void generateIndicesForSlice(const Array2DUint8& pPreviousBitmask,
|
|
const Array2DInt32& m_pPreviousVertexIndicesX,
|
|
const Array2DInt32& m_pPreviousVertexIndicesY,
|
|
const Array2DInt32& m_pPreviousVertexIndicesZ,
|
|
const Array2DInt32& m_pCurrentVertexIndicesX,
|
|
const Array2DInt32& m_pCurrentVertexIndicesY,
|
|
const Array2DInt32& m_pCurrentVertexIndicesZ);
|
|
|
|
//The volume data and a sampler to access it.
|
|
Volume<VoxelType>* m_volData;
|
|
VolumeSampler<VoxelType> m_sampVolume;
|
|
|
|
//Holds a position in volume space.
|
|
int32_t iXVolSpace;
|
|
int32_t iYVolSpace;
|
|
int32_t iZVolSpace;
|
|
|
|
//Holds a position in region space.
|
|
uint32_t uXRegSpace;
|
|
uint32_t uYRegSpace;
|
|
uint32_t uZRegSpace;
|
|
|
|
//Used to return the number of cells in a slice which contain triangles.
|
|
uint32_t m_uNoOfOccupiedCells;
|
|
|
|
//The surface patch we are currently filling.
|
|
SurfaceMesh<PositionMaterialNormal>* m_meshCurrent;
|
|
|
|
//Information about the region we are currently processing
|
|
Region m_regSizeInVoxels;
|
|
Region m_regSizeInCells;
|
|
/*Region m_regSizeInVoxelsCropped;
|
|
Region m_regSizeInVoxelsUncropped;
|
|
Region m_regVolumeCropped;*/
|
|
Region m_regSlicePrevious;
|
|
Region m_regSliceCurrent;
|
|
};
|
|
}
|
|
|
|
#include "SurfaceExtractor.inl"
|
|
|
|
#endif
|