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https://github.com/OpenFOAM/OpenFOAM-6.git
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surfaceFeatureExtract: Refactor core functionality into core classes and libraries
This commit is contained in:
Henry Weller
@ -28,11 +28,6 @@ Description
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Extracts and writes surface features to file. All but the basic feature
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extraction is WIP.
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Curvature calculation is an implementation of the algorithm from:
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"Estimating Curvatures and their Derivatives on Triangle Meshes"
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by S. Rusinkiewicz
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\*---------------------------------------------------------------------------*/
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#include "surfaceFeatureExtract.H"
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@ -56,294 +51,6 @@ const Foam::scalar Foam::externalToleranceCosAngle
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);
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Foam::point Foam::randomPointInPlane(const plane& p)
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{
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// Perturb base point
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const point& refPt = p.refPoint();
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// ax + by + cz + d = 0
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const FixedList<scalar, 4>& planeCoeffs = p.planeCoeffs();
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const scalar perturbX = refPt.x() + 1e-3;
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const scalar perturbY = refPt.y() + 1e-3;
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const scalar perturbZ = refPt.z() + 1e-3;
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if (mag(planeCoeffs[2]) < small)
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{
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if (mag(planeCoeffs[1]) < small)
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{
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const scalar x =
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-1.0
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*(
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planeCoeffs[3]
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+ planeCoeffs[1]*perturbY
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+ planeCoeffs[2]*perturbZ
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)/planeCoeffs[0];
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return point
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(
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x,
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perturbY,
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perturbZ
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);
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}
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const scalar y =
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-1.0
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*(
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planeCoeffs[3]
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+ planeCoeffs[0]*perturbX
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+ planeCoeffs[2]*perturbZ
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)/planeCoeffs[1];
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return point
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(
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perturbX,
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y,
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perturbZ
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);
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}
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else
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{
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const scalar z =
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-1.0
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*(
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planeCoeffs[3]
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+ planeCoeffs[0]*perturbX
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+ planeCoeffs[1]*perturbY
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)/planeCoeffs[2];
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return point
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(
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perturbX,
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perturbY,
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z
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);
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}
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}
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Foam::triadField Foam::calcVertexCoordSys
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(
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const triSurface& surf,
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const vectorField& pointNormals
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)
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{
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const pointField& points = surf.points();
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const Map<label>& meshPointMap = surf.meshPointMap();
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triadField pointCoordSys(points.size());
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forAll(points, pI)
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{
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const point& pt = points[pI];
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const vector& normal = pointNormals[meshPointMap[pI]];
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if (mag(normal) < small)
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{
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pointCoordSys[meshPointMap[pI]] = triad::unset;
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continue;
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}
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plane p(pt, normal);
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// Pick random point in plane
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vector dir1 = pt - randomPointInPlane(p);
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dir1 /= mag(dir1);
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vector dir2 = dir1 ^ normal;
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dir2 /= mag(dir2);
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pointCoordSys[meshPointMap[pI]] = triad(dir1, dir2, normal);
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}
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return pointCoordSys;
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}
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Foam::triSurfacePointScalarField Foam::calcCurvature
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(
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const word& name,
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const Time& runTime,
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const triSurface& surf,
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const vectorField& pointNormals,
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const triadField& pointCoordSys
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)
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{
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Info<< "Calculating face curvature" << endl;
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const pointField& points = surf.points();
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const labelList& meshPoints = surf.meshPoints();
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const Map<label>& meshPointMap = surf.meshPointMap();
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triSurfacePointScalarField curvaturePointField
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(
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IOobject
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(
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name + ".curvature",
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runTime.constant(),
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"triSurface",
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runTime,
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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surf,
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dimLength,
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scalarField(points.size(), 0.0)
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);
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List<symmTensor2D> pointFundamentalTensors
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(
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points.size(),
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symmTensor2D::zero
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);
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scalarList accumulatedWeights(points.size(), 0.0);
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forAll(surf, fi)
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{
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const triFace& f = surf[fi];
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const edgeList fEdges = f.edges();
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// Calculate the edge vectors and the normal differences
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vectorField edgeVectors(f.size(), Zero);
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vectorField normalDifferences(f.size(), Zero);
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forAll(fEdges, feI)
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{
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const edge& e = fEdges[feI];
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edgeVectors[feI] = e.vec(points);
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normalDifferences[feI] =
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pointNormals[meshPointMap[e[0]]]
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- pointNormals[meshPointMap[e[1]]];
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}
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// Set up a local coordinate system for the face
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const vector& e0 = edgeVectors[0];
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const vector eN = f.area(points);
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const vector e1 = (e0 ^ eN);
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if (magSqr(eN) < rootVSmall)
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{
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continue;
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}
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triad faceCoordSys(e0, e1, eN);
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faceCoordSys.normalize();
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// Construct the matrix to solve
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scalarSymmetricSquareMatrix T(3, 0);
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scalarDiagonalMatrix Z(3, 0);
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// Least Squares
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for (label i = 0; i < 3; ++i)
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{
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scalar x = edgeVectors[i] & faceCoordSys[0];
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scalar y = edgeVectors[i] & faceCoordSys[1];
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T(0, 0) += sqr(x);
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T(1, 0) += x*y;
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T(1, 1) += sqr(x) + sqr(y);
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T(2, 1) += x*y;
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T(2, 2) += sqr(y);
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scalar dndx = normalDifferences[i] & faceCoordSys[0];
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scalar dndy = normalDifferences[i] & faceCoordSys[1];
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Z[0] += dndx*x;
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Z[1] += dndx*y + dndy*x;
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Z[2] += dndy*y;
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}
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// Perform Cholesky decomposition and back substitution.
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// Decomposed matrix is in T and solution is in Z.
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LUsolve(T, Z);
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symmTensor2D secondFundamentalTensor(Z[0], Z[1], Z[2]);
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// Loop over the face points adding the contribution of the face
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// curvature to the points.
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forAll(f, fpI)
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{
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const label patchPointIndex = meshPointMap[f[fpI]];
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const triad& ptCoordSys = pointCoordSys[patchPointIndex];
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if (!ptCoordSys.set())
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{
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continue;
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}
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// Rotate faceCoordSys to ptCoordSys
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tensor rotTensor = rotationTensor(ptCoordSys[2], faceCoordSys[2]);
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triad rotatedFaceCoordSys = rotTensor & tensor(faceCoordSys);
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// Project the face curvature onto the point plane
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vector2D cmp1
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(
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ptCoordSys[0] & rotatedFaceCoordSys[0],
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ptCoordSys[0] & rotatedFaceCoordSys[1]
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);
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vector2D cmp2
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(
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ptCoordSys[1] & rotatedFaceCoordSys[0],
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ptCoordSys[1] & rotatedFaceCoordSys[1]
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);
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tensor2D projTensor
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(
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cmp1,
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cmp2
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);
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symmTensor2D projectedFundamentalTensor
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(
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projTensor.x() & (secondFundamentalTensor & projTensor.x()),
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projTensor.x() & (secondFundamentalTensor & projTensor.y()),
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projTensor.y() & (secondFundamentalTensor & projTensor.y())
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);
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// Calculate weight
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// TODO: Voronoi area weighting
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const scalar weight = surf.pointNormalWeight
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(
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f,
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meshPoints[patchPointIndex],
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f.area(points),
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points
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);
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// Sum contribution of face to this point
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pointFundamentalTensors[patchPointIndex] +=
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weight*projectedFundamentalTensor;
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accumulatedWeights[patchPointIndex] += weight;
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}
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}
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forAll(curvaturePointField, pI)
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{
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pointFundamentalTensors[pI] /= (accumulatedWeights[pI] + small);
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vector2D principalCurvatures = eigenValues(pointFundamentalTensors[pI]);
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//scalar curvature =
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// (principalCurvatures[0] + principalCurvatures[1])/2;
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scalar curvature = max
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(
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mag(principalCurvatures[0]),
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mag(principalCurvatures[1])
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);
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//scalar curvature = principalCurvatures[0]*principalCurvatures[1];
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curvaturePointField[meshPoints[pI]] = curvature;
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}
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return curvaturePointField;
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}
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bool Foam::edgesConnected(const edge& e1, const edge& e2)
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{
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if
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@ -455,30 +162,6 @@ Foam::scalar Foam::calcProximityOfFeatureEdges
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}
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void Foam::dumpBox(const treeBoundBox& bb, const fileName& fName)
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{
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OFstream str(fName);
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Info<< "Dumping bounding box " << bb << " as lines to obj file "
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<< str.name() << endl;
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pointField boxPoints(bb.points());
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forAll(boxPoints, i)
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{
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meshTools::writeOBJ(str, boxPoints[i]);
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}
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forAll(treeBoundBox::edges, i)
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{
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const edge& e = treeBoundBox::edges[i];
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str<< "l " << e[0]+1 << ' ' << e[1]+1 << nl;
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}
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}
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void Foam::deleteBox
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(
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const triSurface& surf,
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@ -809,24 +492,6 @@ Foam::surfaceFeatures::edgeStatus Foam::checkFlatRegionEdge
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}
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void Foam::extractCloseness
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(
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const fileName &sFeatFileName,
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const Time& runTime,
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const triSurface &surf,
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const bool writeVTK
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);
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void Foam::extractPointCloseness
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(
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const fileName &sFeatFileName,
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const Time& runTime,
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const triSurface &surf,
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const bool writeVTK
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);
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void Foam::writeStats(const extendedFeatureEdgeMesh& fem, Ostream& os)
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{
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os << " points : " << fem.points().size() << nl
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