Parameters for the mesh generator.
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#include <MeshGenParams.h>
This class serves as a container for the parameters used by the mesh generator, i.e., for the Fade_2D::refineAdvanced() method. Client code can derive a custom class from MeshGenParams and provide specific implementations for methods such as getMaxTriangleArea(Triangle* pT) or getMaxEdgeLength(Triangle* pT) to control the local density of the generated mesh. The meshing algorithm calls these functions during refinement to check whether a triangle meets the conditions for further subdivision.
Quality meshing with different parameter configurations leading to varying results
- See also
- C++ Examples on advanced mesh generation.
◆ MeshGenParams()
| GEOM_FADE2D::MeshGenParams::MeshGenParams |
( |
Zone2 * |
pZone_ | ) |
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inlineexplicit |
Initializes the mesh generator parameters with default values. These can be overridden as needed.
- Parameters
-
| pZone_ | A pointer to the Zone2 to be remeshed. |
◆ addLockedConstraint()
| void GEOM_FADE2D::MeshGenParams::addLockedConstraint |
( |
ConstraintSegment2 * |
pConstraintSegment | ) |
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This method allows the user to specify which ConstraintSegment2 objects should remain intact and not be split during mesh refinement. To use, set bAllowConstraintSplitting to true and then add locked segments using this method.
◆ getMaxEdgeLength()
| virtual double GEOM_FADE2D::MeshGenParams::getMaxEdgeLength |
( |
Triangle2 * |
pT | ) |
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inlinevirtual |
This method is called by the mesh generation algorithm. It returns for a Triangle2 pT the maximum allowed edge length. If any of the edges of pT are larger, then pT will be subdivided. The default implementation returns the value maxEdgeLength for all triangles, which is DBL_MAX by default (indicating no limit). You may change this value or derive a class from MeshGenParams and override the method.
- Parameters
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| pT | A pointer to the Triangle2 being evaluated. |
- Returns
- The maximum edge length allowed for the Triangle2.
User Controlled Mesh Density, the edge length is limited in the lower left corner
◆ getMaxTriangleArea()
| virtual double GEOM_FADE2D::MeshGenParams::getMaxTriangleArea |
( |
Triangle2 * |
pT | ) |
|
|
inlinevirtual |
This method is called by the mesh generation algorithm. It returns for a Triangle2 pT the maximum allowed area. If the area of pT exceeds this value, then pT will be subdivided. The default implementation returns the value maxTriangleArea for all triangles, which is DBL_MAX by default (indicating no limit). You may change this value or derive a class from MeshGenParams and override the method.
- Parameters
-
| pT | A pointer to the Triangle2 being evaluated. |
- Returns
- The maximum area allowed for the Triangle2.
User Controlled Mesh Density, the area is limited in the lower left corner
◆ bAllowConstraintSplitting
| bool GEOM_FADE2D::MeshGenParams::bAllowConstraintSplitting |
The bAllowConstraintSplitting flag determines whether constraint segments can be split during mesh refinement. If set to true, constraint segments are allowed to be divided, otherwise not. Default: true.
◆ bGridMeshingLQ
| bool GEOM_FADE2D::MeshGenParams::bGridMeshingLQ |
This flag allows for faster grid-based meshing at the cost of producing triangles with potentially bad shapes. Set this flag to true to improve performance when grid meshing is enabled. Default: false.
◆ bKeepExistingSteinerPoints
| bool GEOM_FADE2D::MeshGenParams::bKeepExistingSteinerPoints |
A previous call to refine() or refineAdvanced() may have created Steiner points. These points may be partially or entirely removed during a later refinement call, even if the later refinement occurs in a different zone. Whether this behavior is desired depends on your application. Typically, you want to preserve the points, so the default value of bKeepExistingSteinerPoints is true.
◆ bReproducibleResults
| bool GEOM_FADE2D::MeshGenParams::bReproducibleResults |
If true, the algorithm will generate reproducible triangulations. This is useful for debugging and consistency across runs. Set to false for better performance if reproducibility is not required. Default: true.
- Note
- Reproducible results are created inside
pZone. For reproducibility across different zones use Zone2::unifyGrid(0) on the global Zone2.
◆ capAspectLimit
| double GEOM_FADE2D::MeshGenParams::capAspectLimit |
The capAspectLimit parameter limits the ratio of edge length to height for triangles. Triangles with a higher aspect ratio than this value will be subdivided. Default: 10.0.
◆ gridLength
| double GEOM_FADE2D::MeshGenParams::gridLength |
The gridLength parameter determines the length of the grid cells for grid-based meshing. A value greater than 0 enables grid meshing. By default, gridLength=0
Grid Meshing axis aligned
- Note
- The algorithm may automatically adapt the
gridLength a bit such that the grid fits better into the shape.
◆ gridPoint
| Point2 GEOM_FADE2D::MeshGenParams::gridPoint |
This optional point can be used to force the grid mesh to pass through a specific point. By default, the coordinates of gridPoint are initialized to DBL_MAX, which disables this feature. When set, the grid will be aligned such that it passes through the specified point.
◆ gridVector
| Vector2 GEOM_FADE2D::MeshGenParams::gridVector |
This vector determines the alignment of the grid when grid-based meshing is used. By default, the vector is aligned with the x-axis (1.0, 0.0).
Grid meshing with custom alignment, not axis-aligned.
◆ growFactor
| double GEOM_FADE2D::MeshGenParams::growFactor |
The growFactor parameter controls how much adjacent triangles can grow in area. For two adjacent triangles (t0, t1), the ratio of their areas must be less than the growFactor. Recommendation: growFactor>5.0, Default: DBL_MAX (no limit).
◆ growFactorMinArea
| double GEOM_FADE2D::MeshGenParams::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 |
The maxEdgeLength value is returned by the default implementation of MeshGenParams::getMaxEdgeLength(). Larger edges are automatically subdivided. Default value: DBL_MAX (no limit)
◆ maxTriangleArea
| double GEOM_FADE2D::MeshGenParams::maxTriangleArea |
The maxTriangleArea value is returned by the default implementation of MeshGenParams::getMaxTriangleArea(). Larger triangles are automatically subdivided. Default value: DBL_MAX (no limit)
◆ minAngleDegree
| double GEOM_FADE2D::MeshGenParams::minAngleDegree |
This parameter sets the minimum allowable interior angle for triangles in the mesh. Triangles with angles smaller than this value will be refined. The default value is 20.0 degrees, the maximum is 30.0.
◆ minEdgeLength
| double GEOM_FADE2D::MeshGenParams::minEdgeLength |
This parameter sets the minimum edge length for triangles in the mesh. Triangles with edges shorter than this value will not be subdivided. The default value is 1e-3.
◆ pZone
| Zone2* GEOM_FADE2D::MeshGenParams::pZone |
This parameter specifies the Zone2 that the meshing algorithm will operate on.
The documentation for this class was generated from the following file:
