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/*
* 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.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __PROJECTIONS_H__
#define __PROJECTIONS_H__
#include <stdio.h>
#include <stdlib.h>
#define CONTAINS_INDEX
#define GRID_DIMENSION 20
#if defined(_WIN32) && !(_MSC_VER >= 1900)
# define isnan(n) _isnan(n)
# define LONG __int64
# define int64_t __int64
#else
# include <stdint.h>
#endif
/**
* Structures and classes for computing projections of triangles onto
* separating axes during scan conversion
*
* @author Tao Ju
*/
extern const int vertmap[8][3];
extern const int centmap[3][3][3][2];
extern const int edgemap[12][2];
extern const int facemap[6][4];
/* Axes:
* 0, 1, 2: cube face normals
*
* 3: triangle normal
*
* 4, 5, 6,
* 7, 8, 9,
* 10, 11, 12: cross of each triangle edge vector with each cube
* face normal
*/
#define NUM_AXES 13
/**
* Structure for the projections inheritable from parent
*/
struct TriangleProjection {
/// Projections of triangle (min and max)
int64_t tri_proj[NUM_AXES][2];
/// Normal of the triangle
double norm[3];
/// Index of polygon
int index;
};
/* This is a projection for the cube against a single projection
axis, see CubeTriangleIsect.cubeProj */
struct CubeProjection {
int64_t origin;
int64_t edges[3];
int64_t min, max;
};
/**
* Class for projections of cube / triangle vertices on the separating axes
*/
class CubeTriangleIsect {
public:
/// Inheritable portion
TriangleProjection *inherit;
/// Projections of the cube vertices
CubeProjection cubeProj[NUM_AXES];
public:
CubeTriangleIsect()
{
}
/**
* Construction from a cube (axes aligned) and triangle
*/
CubeTriangleIsect(int64_t cube[2][3], int64_t trig[3][3], int64_t error, int triind);
/**
* Construction from a parent CubeTriangleIsect object and the index of
* the children
*/
CubeTriangleIsect(CubeTriangleIsect *parent);
unsigned char getBoxMask();
/**
* Shifting a cube to a new origin
*/
void shift(int off[3]);
/**
* Method to test intersection of the triangle and the cube
*/
int isIntersecting() const;
int isIntersectingPrimary(int edgeInd) const;
float getIntersectionPrimary(int edgeInd) const;
#ifdef WITH_CXX_GUARDEDALLOC
MEM_CXX_CLASS_ALLOC_FUNCS("DUALCON:CubeTriangleIsect")
#endif
};
#endif /* __PROJECTIONS_H__ */
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