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polygonTriangulate: Added robust polygon triangulation algorithm

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The new algorithm provides robust quality triangulations of non-convex
polygons. It also produces a best attempt for polygons that are badly
warped or self intersecting by minimising the area in which the local
normal is in the opposite direction to the overal polygon normal. It is
memory efficient when applied to multiple polygons as it maintains and
reuses its workspace.

This algorithm replaces implementations in the face and
faceTriangulation classes, which have been removed.

Faces can no longer be decomposed into mixtures of tris and
quadrilaterals. Polygonal faces with more than 4 sides are now
decomposed into triangles in foamToVTK and in paraFoam.
This commit is contained in:
Will Bainbridge
2021-06-15 15:34:36 +01:00
parent 01494463d0
commit 02b97a714a
36 changed files with 1777 additions and 1567 deletions
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48
applications/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK/vtkTopo.C
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@ -2,7 +2,7 @@
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2018 OpenFOAM Foundation
\\ / A nd | Copyright (C) 2011-2021 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@ -33,6 +33,7 @@ Description
#include "cellShape.H"
#include "cellModeller.H"
#include "Swap.H"
#include "polygonTriangulate.H"
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
@ -91,11 +92,14 @@ Foam::vtkTopo::vtkTopo(const polyMesh& mesh)
{
const face& f = mesh_.faces()[cFaces[cFacei]];
label nQuads = 0;
label nTris = 0;
f.nTrianglesQuads(mesh_.points(), nTris, nQuads);
nAddCells += nQuads + nTris;
if (f.size() != 4)
{
nAddCells += f.nTriangles();
}
else
{
nAddCells ++;
}
}
nAddCells--;
@ -119,6 +123,9 @@ Foam::vtkTopo::vtkTopo(const polyMesh& mesh)
// Label of vtk type
cellTypes_.setSize(cellShapes.size() + nAddCells);
// Create a triangulation engine
polygonTriangulate triEngine;
// Set counters for additional points and additional cells
label addPointi = 0, addCelli = 0;
@ -205,17 +212,24 @@ Foam::vtkTopo::vtkTopo(const polyMesh& mesh)
const face& f = mesh_.faces()[cFaces[cFacei]];
const bool isOwner = (owner[cFaces[cFacei]] == celli);
// Number of triangles and quads in decomposition
label nTris = 0;
label nQuads = 0;
f.nTrianglesQuads(mesh_.points(), nTris, nQuads);
// Do actual decomposition into triFcs and quadFcs.
faceList triFcs(nTris);
faceList quadFcs(nQuads);
label trii = 0;
label quadi = 0;
f.trianglesQuads(mesh_.points(), trii, quadi, triFcs, quadFcs);
// Do decomposition into triFcs and quadFcs.
faceList triFcs(f.size() == 4 ? 0 : f.nTriangles());
faceList quadFcs(f.size() == 4 ? 1 : 0);
if (f.size() != 4)
{
triEngine.triangulate
(
UIndirectList<point>(mesh.points(), f)
);
forAll(triEngine.triPoints(), trii)
{
triFcs[trii] = triEngine.triPoints(trii, f);
}
}
else
{
quadFcs[0] = f;
}
forAll(quadFcs, quadI)
{