locate_2d.c File Reference

#include "libmmg2d_private.h"

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Macros
#define	EPST   -1e-18

Functions
int	MMG2D_coorbary (MMG5_pMesh mesh, MMG5_pTria pt, double c[2], double *det, double *l1, double *l2)
MMG5_int	MMG2D_isInTriangle (MMG5_pMesh mesh, MMG5_int k, double c[2])
int	MMG2D_cutEdge (MMG5_pMesh mesh, MMG5_pTria pt, MMG5_pPoint ppa, MMG5_pPoint ppb)
int	MMG2D_cutEdgeTriangle (MMG5_pMesh mesh, MMG5_int k, MMG5_int ia, MMG5_int ib)
MMG5_int	MMG2D_findTria (MMG5_pMesh mesh, MMG5_int ip)
int	MMG2D_locateEdge (MMG5_pMesh mesh, MMG5_int ia, MMG5_int ib, MMG5_int *kdep, MMG5_int *list)

Detailed Description

Author

Charles Dapogny (UPMC)

Cécile Dobrzynski (Bx INP/Inria/UBordeaux)

Pascal Frey (UPMC)

Algiane Froehly (Inria/UBordeaux)

Version

5

Copyright

GNU Lesser General Public License.

Definition in file locate_2d.c.

Macro Definition Documentation

EPST

#define EPST   -1e-18

Definition at line 33 of file locate_2d.c.

Function Documentation

MMG2D_coorbary()

int MMG2D_coorbary	(	MMG5_pMesh	mesh,
		MMG5_pTria	pt,
		double	c[2],
		double *	det,
		double *	l1,
		double *	l2
	)

Definition at line 37 of file locate_2d.c.

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MMG2D_cutEdge()

int MMG2D_cutEdge	(	MMG5_pMesh	mesh,
		MMG5_pTria	pt,
		MMG5_pPoint	ppa,
		MMG5_pPoint	ppb
	)

Definition at line 90 of file locate_2d.c.

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MMG2D_cutEdgeTriangle()

int MMG2D_cutEdgeTriangle	(	MMG5_pMesh	mesh,
		MMG5_int	k,
		MMG5_int	ia,
		MMG5_int	ib
	)

Definition at line 129 of file locate_2d.c.

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MMG2D_findTria()

MMG5_int MMG2D_findTria	(	MMG5_pMesh	mesh,
		MMG5_int	ip
	)

Parameters

mesh	pointer toward mesh
ip	point index

Returns

index of one elt containing k or 0 (if no elt is found)

Return the index of one triangle containing k.

Definition at line 221 of file locate_2d.c.

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MMG2D_isInTriangle()

MMG5_int MMG2D_isInTriangle	(	MMG5_pMesh	mesh,
		MMG5_int	k,
		double	c[2]
	)

Check whether c lies in triangle k; return k if so, 0 otherwise

Definition at line 69 of file locate_2d.c.

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MMG2D_locateEdge()

int MMG2D_locateEdge	(	MMG5_pMesh	mesh,
		MMG5_int	ia,
		MMG5_int	ib,
		MMG5_int *	kdep,
		MMG5_int *	list
	)

Parameters

mesh	pointer toward the mesh
ia	index of first extremity of the edge
ib	index of second extremity of the edge
kdep	pointer toward the index of the first element intersecting the edge
list	pointer toward the list of elts intersected by the edge

Returns

4 if the edge exist in the mesh, 0 if fail, ??? otherwise

Calculate the list of all the triangles intersected by edge (ia,ib), starting from kdep = one triangle in the ball of ia; list starts at index 0 (and ends at index lon-1). It stores 3*k + iare, where k is an intersected tria and iare is an intersected edge.

prod1, prod2 and prod3 allow to localize the edge regarding the tria:

• if all are >0, the edge doesn't cross the tria (same sign for all areas)
• if 2 are negative and 1 is positive, the edge intersect 2 triangle edges
• if 2 are 0, the edge pass through 1 of the tria vertices
• if 3 are 0, the edge coincide with 1 of the tria edges

ia-ib intersect 2 triangle edges => 2 products are <0, 1 is >0

Definition at line 329 of file locate_2d.c.

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