artisynth.core.femmodels

Class Tetrahedralizer

java.lang.Object

artisynth.core.femmodels.Tetrahedralizer

public class Tetrahedralizer
extends java.lang.Object

Class to subdivide hexes and wedges into tetrahedra. The subdivisions used in this paper are based on those described in ``How to subdivide pyramids, prisms, and hexahedra into tetrahedra'', by Dompierre, et al., International Meshing Roundtable Conference, 1999.

Field Summary

Fields

Modifier and Type	Field and Description
static int	ALL_CROSS Hex subdivision flag requiring that the diagonals on all faces have opposing directions to those on their opposite face.
static int	DIAG_02 Hex subdivision flag to use the diagonal 0-2 on face (0,1,2,3).
static int	DIAG_05 Hex or wedge subdivision flag to use the diagonal 0-5 on face (0,4,5,1) for hexes or on face (0,2,5,3) for wedges.
static int	DIAG_07 Hex subdivision flag to use the diagonal 0-7 on face (0,3,7,4).
static int	DIAG_13 Wedge subdivision flag to use the diagonal 1-3 on face (0,1,3,4).
static int	DIAG_24 Wedge subdivision flag to use the diagonal 2-4 on face (1,2,5,4).
static int	F0123_CROSS Hex subdivision flag requiring that the diagonals on face (0,1,2,3) its opposite are aligned in opposing directions.
static int	F0374_CROSS Hex subdivision flag requiring that the diagonals on face (0,3,7,4) and its opposite are aligned in opposing directions.
static int	F0451_CROSS Hex subdivision flag requiring that the diagonals on face (0,4,5,1) and its opposite are aligned in opposing directions.
static int	ZERO_DIAGS Hex subdivision flags to use diagonals 0-2, 0-7, and 0-5 on all faces adjacent to node 0.

Constructor Summary

Constructors

Constructor and Description
Tetrahedralizer()

Method Summary

Modifier and Type	Method and Description
TetElement[]	subdivideHex(FemNode3d[] nodes, int code) Create a tesselation for a cubic configuration of nodes, using either 5 or 6 tets as determined by the flags in code, which should be some combination of DIAG_02, DIAG_07, DIAG_05, F0123_CROSS, F0374_CROSS, or F0451_CROSS.
TetElement[]	subdivideHex(FemNode3d n0, FemNode3d n1, FemNode3d n2, FemNode3d n3, FemNode3d n4, FemNode3d n5, FemNode3d n6, FemNode3d n7, boolean allOnX) Create a tesselation for a cubic configuration of nodes, using a Freudenthal cut.
TetElement[]	subdivideHex(FemNode3d n0, FemNode3d n1, FemNode3d n2, FemNode3d n3, FemNode3d n4, FemNode3d n5, FemNode3d n6, FemNode3d n7, int code) Create a tesselation for a cubic configuration of nodes, using either 5 or 6 tets as determined by the flags in code, which should be some combination of DIAG_02, DIAG_07, DIAG_05, F0123_CROSS, F0374_CROSS, or F0451_CROSS.
TetElement[]	subdivideWedge(FemNode3d p0, FemNode3d p1, FemNode3d p2, FemNode3d p3, FemNode3d p4, FemNode3d p5, int type) Create a tesselation for a wedge configuration of nodes.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DIAG_13

public static final int DIAG_13

Wedge subdivision flag to use the diagonal 1-3 on face (0,1,3,4).

See Also:

Constant Field Values

DIAG_24

public static final int DIAG_24

Wedge subdivision flag to use the diagonal 2-4 on face (1,2,5,4).

See Also:

Constant Field Values

DIAG_05

public static final int DIAG_05

Hex or wedge subdivision flag to use the diagonal 0-5 on face (0,4,5,1) for hexes or on face (0,2,5,3) for wedges.

See Also:

Constant Field Values

DIAG_02

public static final int DIAG_02

Hex subdivision flag to use the diagonal 0-2 on face (0,1,2,3).

See Also:

Constant Field Values

DIAG_07

public static final int DIAG_07

Hex subdivision flag to use the diagonal 0-7 on face (0,3,7,4).

See Also:

Constant Field Values

ZERO_DIAGS

public static final int ZERO_DIAGS

Hex subdivision flags to use diagonals 0-2, 0-7, and 0-5 on all faces adjacent to node 0.

See Also:

Constant Field Values

F0123_CROSS

public static final int F0123_CROSS

Hex subdivision flag requiring that the diagonals on face (0,1,2,3) its opposite are aligned in opposing directions.

See Also:

Constant Field Values

F0374_CROSS

public static final int F0374_CROSS

Hex subdivision flag requiring that the diagonals on face (0,3,7,4) and its opposite are aligned in opposing directions.

See Also:

Constant Field Values

F0451_CROSS

public static final int F0451_CROSS

Hex subdivision flag requiring that the diagonals on face (0,4,5,1) and its opposite are aligned in opposing directions.

See Also:

Constant Field Values

ALL_CROSS

public static final int ALL_CROSS

Hex subdivision flag requiring that the diagonals on all faces have opposing directions to those on their opposite face.

See Also:

Constant Field Values

Constructor Detail

Tetrahedralizer

public Tetrahedralizer()

Method Detail

subdivideHex

public TetElement[] subdivideHex(FemNode3d[] nodes,
                                 int code)

Create a tesselation for a cubic configuration of nodes, using either 5 or 6 tets as determined by the flags in code, which should be some combination of DIAG_02, DIAG_07, DIAG_05, F0123_CROSS, F0374_CROSS, or F0451_CROSS. The first four nodes should define a single counter-clockwise face, while the last four should give the corresponding (clockwise) nodes for the opposite face.

subdivideHex

public TetElement[] subdivideHex(FemNode3d n0,
                                 FemNode3d n1,
                                 FemNode3d n2,
                                 FemNode3d n3,
                                 FemNode3d n4,
                                 FemNode3d n5,
                                 FemNode3d n6,
                                 FemNode3d n7,
                                 int code)

Create a tesselation for a cubic configuration of nodes, using either 5 or 6 tets as determined by the flags in code, which should be some combination of DIAG_02, DIAG_07, DIAG_05, F0123_CROSS, F0374_CROSS, or F0451_CROSS. The first four nodes should define a single counter-clockwise face, while the last four should give the corresponding (clockwise) nodes for the opposite face.

subdivideHex

public TetElement[] subdivideHex(FemNode3d n0,
                                 FemNode3d n1,
                                 FemNode3d n2,
                                 FemNode3d n3,
                                 FemNode3d n4,
                                 FemNode3d n5,
                                 FemNode3d n6,
                                 FemNode3d n7,
                                 boolean allOnX)

Create a tesselation for a cubic configuration of nodes, using a Freudenthal cut. The first four nodes should define a single counter-clockwise face, while the last four should give the corresponding (clockwise) nodes for the opposite face. If allOnX is true, it means that nodes n0, n2, n5, and n7 form the internal tetrahedron of the Freudenthal cut. Otherwise, this tetrahedron is formed from nodes n1, n3, n4 and n7.

subdivideWedge

public TetElement[] subdivideWedge(FemNode3d p0,
                                   FemNode3d p1,
                                   FemNode3d p2,
                                   FemNode3d p3,
                                   FemNode3d p4,
                                   FemNode3d p5,
                                   int type)

Create a tesselation for a wedge configuration of nodes. The first three nodes should define a single counter-clockwise face, while the last three should give the corresponding (clockwise) nodes for the opposite face. The tesselation type is controlled by a code type, which is an ored combination of DIAG_13, DIAG_24, and DIAG_05 describing the diagonal directions on faces (0,1,3,4), (1,2,5,4), and (0,2,5,3). Not all diagnonal combinations are possible, so bit patterns 0x0 and (DIAG_13|DIAG_24|DIAG_05) are illegal.