Fade2D Documentation pages v2.16.3
Delaunay Features
GEOM_FADE2D::MeshGenParams Class Reference

Parameters for the mesh generator. More...

#include <MeshGenParams.h>

Public Member Functions

 MeshGenParams (Zone2 *pZone_)
 
void addLockedConstraint (ConstraintSegment2 *pConstraintSegment)
 Constraint Segments that shall not be splitted. More...
 
virtual double getMaxEdgeLength (Triangle2 *pT)
 getMaxEdgeLength(Triangle2* pT) More...
 
virtual double getMaxTriangleArea (Triangle2 *pT)
 getMaxTriangleArea(Triangle2* pT) More...
 

Public Attributes

bool bAllowConstraintSplitting
 bAllowConstraintSplitting More...
 
bool bGridMeshingLQ
 Low quality but high performance grid meshing. More...
 
bool bKeepExistingSteinerPoints
 Steiner points from previous refinements. More...
 
bool bReproducibleResults
 Reproducible results. More...
 
double capAspectLimit
 capAspectLimit More...
 
int command
 Command. More...
 
double gridLength
 gridLength More...
 
Point2 gridPoint
 Grid Point. More...
 
Vector2 gridVector
 gridVector More...
 
double growFactor
 growFactor More...
 
double growFactorMinArea
 growFactorMinArea More...
 
double maxEdgeLength
 Maximum edge length. More...
 
double maxTriangleArea
 maxTriangleArea More...
 
double minAngleDegree
 Minimum interior triangle angle. More...
 
double minEdgeLength
 Minimum edge length. More...
 
Zone2pZone
 Zone to be meshed.
 

Detailed Description

Parameters for the mesh generator.

This class serves as container for mesh generator parameters. Client code can provide a class which derives from MeshGenParams and which provides custom implementations of the getMaxTriangleArea(Triangle* pT) method or the getMaxEdgeLength(Triangle* pT) method in order to gain control over the local density of the generated mesh. The meshing algorithm calls these functions to decide if a certain triangle must be refined.

See also
http://www.geom.at/advanced-mesh-generation/

Member Function Documentation

◆ addLockedConstraint()

void GEOM_FADE2D::MeshGenParams::addLockedConstraint ( ConstraintSegment2 pConstraintSegment)

Constraint Segments that shall not be splitted.

In case that some ConstraintSegment2 can be splitted and others must not be splitted use bAllowConstraintSplitting=true and add the ones that must not be splitted.

◆ getMaxEdgeLength()

virtual double GEOM_FADE2D::MeshGenParams::getMaxEdgeLength ( Triangle2 pT)
inlinevirtual

getMaxEdgeLength(Triangle2* pT)

Parameters
pTis a triangle for which the meshing algorithm checks if it must be refined.

The default implementation of the present class returns the value maxEdgeLength (which is DBL_MAX if not changed by the user). This method can be overridden by the client software in order to control the local mesh density.

User Controlled Mesh Density, Edge Length

◆ getMaxTriangleArea()

virtual double GEOM_FADE2D::MeshGenParams::getMaxTriangleArea ( Triangle2 pT)
inlinevirtual

getMaxTriangleArea(Triangle2* pT)

Parameters
pTis a triangle for which the meshing algorithm checks if it must be refined.

The default implementation of the present class returns the value maxTriangleArea (which is the default value DBL_MAX if not changed by the user). This method can be overridden by the client software in order to control the local mesh density.

User Controlled Mesh Density, Area

Member Data Documentation

◆ bAllowConstraintSplitting

bool GEOM_FADE2D::MeshGenParams::bAllowConstraintSplitting

bAllowConstraintSplitting

Defines if constraint segments can be splitted. Default: yes

◆ bGridMeshingLQ

bool GEOM_FADE2D::MeshGenParams::bGridMeshingLQ

Low quality but high performance grid meshing.

By default bGridMeshingLQ=false in order to create high quality triangles everywhere. By using bGridMeshingLQ=true you can save time but a few bad shaped triangles may remain. This option works only together with grid-meshing.

◆ bKeepExistingSteinerPoints

bool GEOM_FADE2D::MeshGenParams::bKeepExistingSteinerPoints

Steiner points from previous refinements.

A previous call to refine() or refineAdvanced() may have created Steiner points. These may be partially or entirely removed during a later refinement call, even (!) if this later refinement takes place in a different zone. It depends on your application if this behavior is desired or not. Usually you want to preserve the points, thus the default value of /p bKeepExistingSteinerPoints is true.

◆ bReproducibleResults

bool GEOM_FADE2D::MeshGenParams::bReproducibleResults

Reproducible results.

By default the algorithm generates reproducible triangulations. If not required you can disable that with bReproducibleResults=false to save time.

Note
Reproducible results are created inside pZone. If you need reproducable results outside also then create a global zone and call unifyGrid(0) once.

◆ capAspectLimit

double GEOM_FADE2D::MeshGenParams::capAspectLimit

capAspectLimit

Limits the quotient edgeLength / height. Default value: 10.0

◆ command

int GEOM_FADE2D::MeshGenParams::command

Command.

A command for development, not for public use. Will vanish soon.

◆ gridLength

double GEOM_FADE2D::MeshGenParams::gridLength

gridLength

Set gridLength > 0 to mesh large enough areas with grid points. Border areas and narrow stripes where a grid does not fit are automatically meshed using classic Delaunay methods. By default gridLength=0 (off).

Note
The length of the diagonals in the grid is sqrt(2)*gridLength and the algorithm may automatically adapt the gridLength a bit such that the grid fits better into the shape.
Grid Meshing axis aligned

◆ gridPoint

Point2 GEOM_FADE2D::MeshGenParams::gridPoint

Grid Point.

An optional point through which the grid-mesh must pass

◆ gridVector

Vector2 GEOM_FADE2D::MeshGenParams::gridVector

gridVector

When grid-meshing is used the grid is aligned to the gridVector. By default gridVector is axis aligned.

Grid Meshing along Vector2(1.0,0.3)

◆ growFactor

double GEOM_FADE2D::MeshGenParams::growFactor

growFactor

Limits the growth of adjacent triangles. The mesh is constructed such that for any two adjacent triangles t0 and t1 (where t0 is the larger one) area(t0)/area(t1) < growFactor. Recommendation: growFactor>5.0, Default: growFactor=DBL_MAX

◆ growFactorMinArea

double GEOM_FADE2D::MeshGenParams::growFactorMinArea

growFactorMinArea

The growFactor value is ignored for triangles with a smaller area than growFactorMinArea. This value prevents generation of hundreds of tiny triangles around one that is unusually small. Default: 0.001

◆ maxEdgeLength

double GEOM_FADE2D::MeshGenParams::maxEdgeLength

Maximum edge length.

This value is returned by the default implementation of getMaxEdgeLength(Triangle* pT). Larger edges are automatically subdivided. If a custom implementation of getMaxEdgeLength(Triangle* pT) is provided then this value is ignored. Default value: DBL_MAX.

◆ maxTriangleArea

double GEOM_FADE2D::MeshGenParams::maxTriangleArea

maxTriangleArea

This value is returned by the default implementation of getMaxTriangleArea(Triangle* pT). Larger triangles are automatically subdivided. If a custom implementation of getMaxTriangleArea(Triangle* pT) is provided then this value is ignored. Default value: DBL_MAX.

◆ minAngleDegree

double GEOM_FADE2D::MeshGenParams::minAngleDegree

Minimum interior triangle angle.

Minimum interior angle: Default: 20.0, maximum: 30.0

◆ minEdgeLength

double GEOM_FADE2D::MeshGenParams::minEdgeLength

Minimum edge length.

Edges below the minimum length are not subdivided. This parameter is useful to avoid tiny triangles. Default: 0.001


The documentation for this class was generated from the following file: