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0028089: Mesh - New algorithm for triangulation of 2d polygons

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Added custom meshing core algorithm to generate base mesh using Delabella library,
which can be enabled via IMeshTools_Parameters::MeshAlgo option or CSF_MeshAlgo environment variable.

Do not fill cirles filter upon explicit initialization.
Call base postProcessMesh functionality after initialization of circles in BRepMesh_CustomDelaunayBaseMeshAlgo.

Added Vsprintf() wrapper for vsprintf() preserving C locale.
This commit is contained in:
oan
2019-07-10 13:04:25 +03:00
committed by bugmaster
parent 689dc3b1c9
commit f2006a6f19
30 changed files with 1923 additions and 68 deletions
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dox/user_guides/modeling_algos/modeling_algos.md
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@@ -3251,6 +3251,40 @@ In general, face meshing algorithms have the following structure:
* Classes *BRepMesh_DelaunayNodeInsertionMeshAlgo* and *BRepMesh_SweepLineNodeInsertionMeshAlgo* implement algorithm-specific functionality related to addition of internal nodes supplementing functionality provided by *BRepMesh_NodeInsertionMeshAlgo*;
* *BRepMesh_DelaunayDeflectionControlMeshAlgo* extends functionality of *BRepMesh_DelaunayNodeInsertionMeshAlgo* by additional procedure controlling deflection of generated triangles.
BRepMesh provides user a way to switch default triangulation algorithm to a custom one, either implemented by user or available worldwide.
There are three base classes that can be currently used to integrate 3rd-party algorithms:
* *BRepMesh_ConstrainedBaseMeshAlgo* base class for tools providing generation of triangulations with constraints requiring no common processing by BRepMesh;
* *BRepMesh_CustomBaseMeshAlgo* provides the entry point for generic algorithms without support of constraints and supposed for generation of base mesh only.
Constraint edges are processed using standard functionality provided by the component itself upon background mesh produced by 3rd-party solver;
* *BRepMesh_CustomDelaunayBaseMeshAlgo* contains initialization part for tools used by BRepMesh for checks or optimizations using results of 3rd-party algorithm.
Meshing algorithms could be provided by implemeting IMeshTools_MeshAlgoFactory with related interfaces and passing it to BRepMesh_Context::SetFaceDiscret().
OCCT comes with two base 2D meshing algorithms: BRepMesh_MeshAlgoFactory (used by default) and BRepMesh_DelabellaMeshAlgoFactory.
The following example demonstrates how it could be done from Draw environment:
~~~~~
psphere s 10
### Default Algo ###
incmesh s 0.0001 -algo default
### Delabella Algo ###
incmesh s 0.0001 -algo delabella
~~~~~
The code snippet below shows passing a custom mesh factory to BRepMesh_IncrementalMesh:
~~~~~
IMeshTools_Parameters aMeshParams;
Handle(IMeshTools_Context) aContext = new BRepMesh_Context();
aContext->SetFaceDiscret (new BRepMesh_FaceDiscret (new BRepMesh_DelabellaMeshAlgoFactory()));
BRepMesh_IncrementalMesh aMesher;
aMesher.SetShape (aShape);
aMesher.ChangeParameters() = aMeshParams;
aMesher.Perform (aContext);
~~~~~
#### Range splitter
Range splitter tools provide functionality to generate internal surface nodes defined within the range computed using discrete model data. The base functionality is provided by *BRepMesh_DefaultRangeSplitter* which can be used without modifications in case of planar surface. The default splitter does not generate any internal node.