C++ triSurface::edges方法代码示例

// Update intersections for selected edges.
void Foam::edgeIntersections::intersectEdges
(
    const triSurface& surf1,
    const pointField& points1,          // surf1 meshPoints (not localPoints!)
    const triSurfaceSearch& querySurf2,
    const scalarField& surf1PointTol,   // surf1 tolerance per point
    const labelList& edgeLabels
)
{
    const triSurface& surf2 = querySurf2.surface();
    const vectorField& normals2 = surf2.faceNormals();

    const labelList& meshPoints = surf1.meshPoints();

    if (debug)
    {
        Pout<< "Calculating intersection of " << edgeLabels.size() << " edges"
            << " out of " << surf1.nEdges() << " with " << surf2.size()
            << " triangles ..." << endl;
    }

    pointField start(edgeLabels.size());
    pointField end(edgeLabels.size());
    vectorField edgeDirs(edgeLabels.size());

    // Go through all edges, calculate intersections
    forAll(edgeLabels, i)
    {
        label edgeI = edgeLabels[i];

        if (debug)// && (i % 1000 == 0))
        {
            Pout<< "Intersecting edge " << edgeI << " with surface" << endl;
        }

        const edge& e = surf1.edges()[edgeI];

        const point& pStart = points1[meshPoints[e.start()]];
        const point& pEnd = points1[meshPoints[e.end()]];

        const vector eVec(pEnd - pStart);
        const vector n(eVec/(mag(eVec) + VSMALL));

        // Start tracking somewhat before pStart and up to somewhat after p1.
        // Note that tolerances here are smaller than those used to classify
        // hit below.
        // This will cause this hit to be marked as degenerate and resolved
        // later on.
        start[i] = pStart - 0.5*surf1PointTol[e[0]]*n;
        end[i] = pEnd + 0.5*surf1PointTol[e[1]]*n;

        edgeDirs[i] = n;
    }

void Foam::edgeIntersections::checkEdges(const triSurface& surf)
{
    const pointField& localPoints = surf.localPoints();
    const edgeList& edges = surf.edges();
    const labelListList& edgeFaces = surf.edgeFaces();

    treeBoundBox bb(localPoints);

    scalar minSize = SMALL * bb.minDim();

    forAll(edges, edgeI)
    {
        const edge& e = edges[edgeI];

        scalar eMag = e.mag(localPoints);

        if (eMag < minSize)
        {
            WarningIn
            (
                "Foam::edgeIntersections::checkEdges(const triSurface& surf)"
            )   << "Edge " << edgeI << " vertices " << e
                << " coords:" << localPoints[e[0]] << ' '
                << localPoints[e[1]] << " is very small compared to bounding"
                << " box dimensions " << bb << endl
                << "This might lead to problems in intersection"
                << endl;
        }

        if (edgeFaces[edgeI].size() == 1)
        {
            WarningIn
            (
                "Foam::edgeIntersections::checkEdges(const triSurface& surf)"
            )   << "Edge " << edgeI << " vertices " << e
                << " coords:" << localPoints[e[0]] << ' '
                << localPoints[e[1]] << " has only one face connected to it:"
                << edgeFaces[edgeI] << endl
                << "This might lead to problems in intersection"
                << endl;
        }
    }
}

// Update intersections for selected edges.
void Foam::edgeIntersections::intersectEdges
(
    const triSurface& surf1,
    const pointField& points1,          // surf1 meshPoints (not localPoints!)
    const triSurfaceSearch& querySurf2,
    const scalarField& surf1PointTol,   // surf1 tolerance per point
    const labelList& edgeLabels
)
{
    const triSurface& surf2 = querySurf2.surface();
    const vectorField& normals2 = surf2.faceNormals();

    const labelList& meshPoints = surf1.meshPoints();

    if (debug)
    {
        Pout<< "Calculating intersection of " << edgeLabels.size() << " edges"
            << " out of " << surf1.nEdges() << " with " << surf2.size()
            << " triangles ..." << endl;
    }

    // Construct octree.
    const indexedOctree<treeDataTriSurface>& tree = querySurf2.tree();


    label nHits = 0;


    // Go through all edges, calculate intersections
    forAll(edgeLabels, i)
    {
        label edgeI = edgeLabels[i];

        if (debug && (i % 1000 == 0))
        {
            Pout<< "Intersecting edge " << edgeI << " with surface" << endl;
        }

        const edge& e = surf1.edges()[edgeI];

        const point& pStart = points1[meshPoints[e.start()]];
        const point& pEnd = points1[meshPoints[e.end()]];

        const vector eVec(pEnd - pStart);
        const scalar eMag = mag(eVec);
        const vector n(eVec/(eMag + VSMALL));

        // Smallish length for intersection calculation errors.
        const point tolVec = 1e-6*eVec;

        // Start tracking somewhat before pStart and upto somewhat after p1.
        // Note that tolerances here are smaller than those used to classify
        // hit below.
        // This will cause this hit to be marked as degenerate and resolved
        // later on.
        point p0 = pStart - 0.5*surf1PointTol[e[0]]*n;
        const point p1 = pEnd + 0.5*surf1PointTol[e[1]]*n;
        const scalar maxS = mag(p1 - pStart);

        // Get all intersections of the edge with the surface

        DynamicList<pointIndexHit> currentIntersections(100);
        DynamicList<label> currentIntersectionTypes(100);

        while (true)
        {
            pointIndexHit pHit = tree.findLine(p0, p1);

            if (pHit.hit())
            {
                nHits++;

                currentIntersections.append(pHit);

                // Classify point on surface1 edge.
                label edgeEnd = -1;

                if (mag(pHit.hitPoint() - pStart) < surf1PointTol[e[0]])
                {
                    edgeEnd = 0;
                }
                else if (mag(pHit.hitPoint() - pEnd) < surf1PointTol[e[1]])
                {
                    edgeEnd = 1;
                }
                else if (mag(n & normals2[pHit.index()]) < alignedCos_)
                {
                    Pout<< "Flat angle edge:" << edgeI
                        << " face:" << pHit.index()
                        << " cos:" << mag(n & normals2[pHit.index()])
                        << endl;
                    edgeEnd = 2;
                }

                currentIntersectionTypes.append(edgeEnd);

                if (edgeEnd == 1)
                {
                    // Close to end
//.........这里部分代码省略.........

// Checks if there exists a special topological situation that causes
// edge and the face it hit not to be recognized.
//
// For now if the face shares a point with the edge
bool Foam::surfaceIntersection::excludeEdgeHit
(
    const triSurface& surf,
    const label edgeI,
    const label faceI,
    const scalar
)
{
    const labelledTri& f = surf.localFaces()[faceI];

    const edge& e = surf.edges()[edgeI];

    if
    (
        (f[0] == e.start())
     || (f[0] == e.end())
     || (f[1] == e.start())
     || (f[1] == e.end())
     || (f[2] == e.start())
     || (f[2] == e.end())
    )
    {
        return true;

//        // Get edge vector
//        vector eVec = e.vec(surf.localPoints());
//        eVec /= mag(eVec) + VSMALL;
//
//        const labelList& eLabels = surf.faceEdges()[faceI];
//
//        // Get edge vector of 0th edge of face
//        vector e0Vec = surf.edges()[eLabels[0]].vec(surf.localPoints());
//        e0Vec /= mag(e0Vec) + VSMALL;
//
//        vector n = e0Vec ^ eVec;
//
//        if (mag(n) < SMALL)
//        {
//            // e0 is aligned with e. Choose next edge of face.
//            vector e1Vec = surf.edges()[eLabels[1]].vec(surf.localPoints());
//            e1Vec /= mag(e1Vec) + VSMALL;
//
//            n = e1Vec ^ eVec;
//
//            if (mag(n) < SMALL)
//            {
//                // Problematic triangle. Two edges aligned with edgeI. Give
//                // up.
//                return true;
//            }
//        }
//
//        // Check if same as faceNormal
//        if (mag(n & surf.faceNormals()[faceI]) > 1-tol)
//        {
//
//            Pout<< "edge:" << e << "  face:" << faceI
//                << "  e0Vec:" << e0Vec << "  n:" << n
//                << "  normalComponent:" << (n & surf.faceNormals()[faceI])
//                << "  tol:" << tol << endl;
//
//            return true;
//        }
//        else
//        {
//            return false;
//        }
    }
    else
    {
        return false;
    }
}

Foam::labelList Foam::orientedSurface::edgeToFace
(
    const triSurface& s,
    const labelList& changedEdges,
    labelList& flip
)
{
    labelList changedFaces(2*changedEdges.size());
    label changedI = 0;

    // 1.6.x merge: using local faces.  Reconsider
    // Rewrite uses cached local faces for efficiency
    // HJ, 24/Aug/2010
    const List<labelledTri> lf =  s.localFaces();

    forAll(changedEdges, i)
    {
        label edgeI = changedEdges[i];

        const labelList& eFaces = s.edgeFaces()[edgeI];

        if (eFaces.size() < 2)
        {
            // Do nothing, faces was already visited.
        }
        else if (eFaces.size() == 2)
        {
            label face0 = eFaces[0];
            label face1 = eFaces[1];

            const labelledTri& f0 = lf[face0];
            const labelledTri& f1 = lf[face1];

            // Old.  HJ, 24/Aug/2010
//            const labelledTri& f0 = s[face0];
//            const labelledTri& f1 = s[face1];

            if (flip[face0] == UNVISITED)
            {
                if (flip[face1] == UNVISITED)
                {
                    FatalErrorIn("orientedSurface::edgeToFace") << "Problem"
                            << abort(FatalError);
                }
                else
                {
                    // Face1 has a flip state, face0 hasn't
                    if (consistentEdge(s.edges()[edgeI], f0, f1))
                    {
                        // Take over flip status
                        flip[face0] = (flip[face1] == FLIP ? FLIP : NOFLIP);
                    }
                    else
                    {
                        // Invert
                        flip[face0] = (flip[face1] == FLIP ? NOFLIP : FLIP);
                    }
                    changedFaces[changedI++] = face0;
                }
            }
            else
            {
                if (flip[face1] == UNVISITED)
                {
                    // Face0 has a flip state, face1 hasn't
                    if (consistentEdge(s.edges()[edgeI], f0, f1))
                    {
                        flip[face1] = (flip[face0] == FLIP ? FLIP : NOFLIP);
                    }
                    else
                    {
                        flip[face1] = (flip[face0] == FLIP ? NOFLIP : FLIP);
                    }
                    changedFaces[changedI++] = face1;
                }
            }
        }
        else
        {
            // Multiply connected. Do what?
        }
    }