566 lines
13 KiB
C++
566 lines
13 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | foam-extend: Open Source CFD
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\\ / O peration | Version: 4.0
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\\ / A nd | Web: http://www.foam-extend.org
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\\/ M anipulation | For copyright notice see file Copyright
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-------------------------------------------------------------------------------
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License
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This file is part of foam-extend.
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foam-extend is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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foam-extend is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with foam-extend. If not, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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#include "treeDataPrimitivePatch.H"
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#include "indexedOctree.H"
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#include "triangleFuncs.H"
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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template
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<
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class Face,
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template<class> class FaceList,
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class PointField,
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class PointType
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>
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Foam::scalar
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Foam::treeDataPrimitivePatch<Face, FaceList, PointField, PointType>::
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tolSqr = sqr(1E-6);
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// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
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template
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<
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class Face,
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template<class> class FaceList,
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class PointField,
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class PointType
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>
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Foam::treeBoundBox
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Foam::treeDataPrimitivePatch<Face, FaceList, PointField, PointType>::
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calcBb
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(
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const pointField& points,
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const face& f
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)
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{
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treeBoundBox bb(points[f[0]], points[f[0]]);
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for (label fp = 1; fp < f.size(); fp++)
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{
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const point& p = points[f[fp]];
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bb.min() = min(bb.min(), p);
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bb.max() = max(bb.max(), p);
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}
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return bb;
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}
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template
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<
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class Face,
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template<class> class FaceList,
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class PointField,
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class PointType
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>
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void Foam::treeDataPrimitivePatch<Face, FaceList, PointField, PointType>::
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update()
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{
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if (cacheBb_)
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{
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bbs_.setSize(patch_.size());
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forAll(patch_, i)
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{
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bbs_[i] = calcBb(patch_.points(), patch_[i]);
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}
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}
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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// Construct from components
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template
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<
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class Face,
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template<class> class FaceList,
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class PointField,
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class PointType
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>
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Foam::treeDataPrimitivePatch<Face, FaceList, PointField, PointType>::
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treeDataPrimitivePatch
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(
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const bool cacheBb,
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const PrimitivePatch<Face, FaceList, PointField, PointType>& patch
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)
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:
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patch_(patch),
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cacheBb_(cacheBb)
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{
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update();
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}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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template
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<
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class Face,
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template<class> class FaceList,
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class PointField,
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class PointType
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>
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Foam::pointField
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Foam::treeDataPrimitivePatch<Face, FaceList, PointField, PointType>::
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points() const
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{
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pointField cc(patch_.size());
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forAll(patch_, i)
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{
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cc[i] = patch_[i].centre(patch_.points());
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}
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return cc;
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}
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//- Get type (inside,outside,mixed,unknown) of point w.r.t. surface.
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// Only makes sense for closed surfaces.
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template
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<
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class Face,
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template<class> class FaceList,
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class PointField,
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class PointType
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>
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Foam::label
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Foam::treeDataPrimitivePatch<Face, FaceList, PointField, PointType>::
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getVolumeType
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(
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const indexedOctree
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<
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treeDataPrimitivePatch
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<
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Face,
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FaceList,
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PointField,
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PointType
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>
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>& oc,
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const point& sample
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) const
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{
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// Need to determine whether sample is 'inside' or 'outside'
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// Done by finding nearest face. This gives back a face which is
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// guaranteed to contain nearest point. This point can be
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// - in interior of face: compare to face normal
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// - on edge of face: compare to edge normal
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// - on point of face: compare to point normal
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// Unfortunately the octree does not give us back the intersection point
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// or where on the face it has hit so we have to recreate all that
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// information.
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// Find nearest face to sample
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pointIndexHit info = oc.findNearest(sample, sqr(GREAT));
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if (info.index() == -1)
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{
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FatalErrorIn
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(
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"treeDataPrimitivePatch::getSampleType"
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"(indexedOctree<treeDataPrimitivePatch>&, const point&)"
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) << "Could not find " << sample << " in octree."
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<< abort(FatalError);
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}
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// Get actual intersection point on face
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label faceI = info.index();
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if (debug & 2)
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{
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Pout<< "getSampleType : sample:" << sample
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<< " nearest face:" << faceI;
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}
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const pointField& points = patch_.localPoints();
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const face& f = patch_.localFaces()[faceI];
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// Retest to classify where on face info is. Note: could be improved. We
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// already have point.
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pointHit curHit = f.nearestPoint(sample, points);
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const vector area = f.normal(points);
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const point& curPt = curHit.rawPoint();
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//
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// 1] Check whether sample is above face
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//
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if (curHit.hit())
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{
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// Nearest point inside face. Compare to face normal.
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if (debug & 2)
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{
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Pout<< " -> face hit:" << curPt
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<< " comparing to face normal " << area << endl;
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}
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return indexedOctree<treeDataPrimitivePatch>::getSide
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(
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area,
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sample - curPt
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);
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}
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if (debug & 2)
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{
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Pout<< " -> face miss:" << curPt;
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}
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//
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// 2] Check whether intersection is on one of the face vertices or
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// face centre
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//
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const scalar typDimSqr = mag(area) + VSMALL;
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forAll(f, fp)
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{
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if ((magSqr(points[f[fp]] - curPt)/typDimSqr) < tolSqr)
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{
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// Face intersection point equals face vertex fp
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// Calculate point normal (wrong: uses face normals instead of
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// triangle normals)
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return indexedOctree<treeDataPrimitivePatch>::getSide
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(
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patch_.pointNormals()[f[fp]],
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sample - curPt
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);
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}
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}
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const point fc(f.centre(points));
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if ((magSqr(fc - curPt)/typDimSqr) < tolSqr)
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{
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// Face intersection point equals face centre. Normal at face centre
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// is already average of face normals
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if (debug & 2)
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{
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Pout<< " -> centre hit:" << fc
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<< " distance:" << magSqr(fc - curPt)/typDimSqr << endl;
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}
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return indexedOctree<treeDataPrimitivePatch>::getSide
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(
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area,
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sample - curPt
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);
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}
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//
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// 3] Get the 'real' edge the face intersection is on
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//
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const labelList& fEdges = patch_.faceEdges()[faceI];
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forAll(fEdges, fEdgeI)
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{
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label edgeI = fEdges[fEdgeI];
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const edge& e = patch_.edges()[edgeI];
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pointHit edgeHit = e.line(points).nearestDist(sample);
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if ((magSqr(edgeHit.rawPoint() - curPt)/typDimSqr) < tolSqr)
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{
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// Face intersection point lies on edge e
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// Calculate edge normal (wrong: uses face normals instead of
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// triangle normals)
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const labelList& eFaces = patch_.edgeFaces()[edgeI];
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vector edgeNormal(vector::zero);
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forAll(eFaces, i)
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{
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edgeNormal += patch_.faceNormal()[eFaces[i]];
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}
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if (debug & 2)
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{
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Pout<< " -> real edge hit point:" << edgeHit.rawPoint()
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<< " comparing to edge normal:" << edgeNormal
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<< endl;
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}
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// Found face intersection point on this edge. Compare to edge
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// normal
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return indexedOctree<treeDataPrimitivePatch>::getSide
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(
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edgeNormal,
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sample - curPt
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);
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}
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}
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//
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// 4] Get the internal edge the face intersection is on
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//
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forAll(f, fp)
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{
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pointHit edgeHit = linePointRef
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(
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points[f[fp]],
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fc
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).nearestDist(sample);
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if ((magSqr(edgeHit.rawPoint() - curPt)/typDimSqr) < tolSqr)
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{
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// Face intersection point lies on edge between two face triangles
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// Calculate edge normal as average of the two triangle normals
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vector e = points[f[fp]] - fc;
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vector ePrev = points[f[f.rcIndex(fp)]] - fc;
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vector eNext = points[f[f.fcIndex(fp)]] - fc;
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vector nLeft = ePrev ^ e;
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nLeft /= mag(nLeft) + VSMALL;
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vector nRight = e ^ eNext;
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nRight /= mag(nRight) + VSMALL;
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if (debug & 2)
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{
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Pout<< " -> internal edge hit point:" << edgeHit.rawPoint()
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<< " comparing to edge normal "
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<< 0.5*(nLeft + nRight)
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<< endl;
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}
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// Found face intersection point on this edge. Compare to edge
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// normal
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return indexedOctree<treeDataPrimitivePatch>::getSide
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(
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0.5*(nLeft + nRight),
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sample - curPt
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);
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}
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}
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if (debug & 2)
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{
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Pout<< "Did not find sample " << sample
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<< " anywhere related to nearest face " << faceI << endl
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<< "Face:";
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forAll(f, fp)
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{
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Pout<< " vertex:" << f[fp] << " coord:" << points[f[fp]]
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<< endl;
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}
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}
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// Can't determine status of sample with respect to nearest face.
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// Either
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// - tolerances are wrong. (if e.g. face has zero area)
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// - or (more likely) surface is not closed.
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return indexedOctree<treeDataPrimitivePatch>::UNKNOWN;
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}
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// Check if any point on shape is inside cubeBb.
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template
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<
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class Face,
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template<class> class FaceList,
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class PointField,
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class PointType
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>
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bool
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Foam::treeDataPrimitivePatch<Face, FaceList, PointField, PointType>::
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overlaps
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(
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const label index,
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const treeBoundBox& cubeBb
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) const
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{
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// 1. Quick rejection: bb does not intersect face bb at all
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if (cacheBb_)
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{
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if (!cubeBb.overlaps(bbs_[index]))
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{
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return false;
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}
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}
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else
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{
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if (!cubeBb.overlaps(calcBb(patch_.points(), patch_[index])))
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{
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return false;
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}
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}
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// 2. Check if one or more face points inside
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const pointField& points = patch_.points();
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const face& f = patch_[index];
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forAll(f, fp)
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{
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if (cubeBb.contains(points[f[fp]]))
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{
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return true;
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}
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}
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// 3. Difficult case: all points are outside but connecting edges might
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// go through cube. Use triangle-bounding box intersection.
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const point fc = f.centre(points);
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forAll(f, fp)
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{
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bool triIntersects = triangleFuncs::intersectBb
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(
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points[f[fp]],
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points[f[f.fcIndex(fp)]],
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fc,
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cubeBb
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);
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if (triIntersects)
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{
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return true;
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}
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}
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return false;
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}
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// Calculate nearest point to sample. Updates (if any) nearestDistSqr, minIndex,
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// nearestPoint.
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template
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<
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class Face,
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template<class> class FaceList,
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class PointField,
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class PointType
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>
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void
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Foam::treeDataPrimitivePatch<Face, FaceList, PointField, PointType>::
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findNearest
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(
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const labelList& indices,
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const point& sample,
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scalar& nearestDistSqr,
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label& minIndex,
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point& nearestPoint
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) const
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{
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const pointField& points = patch_.points();
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forAll(indices, i)
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{
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label index = indices[i];
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const face& f = patch_[index];
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pointHit nearHit = f.nearestPoint(sample, points);
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scalar distSqr = sqr(nearHit.distance());
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if (distSqr < nearestDistSqr)
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{
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nearestDistSqr = distSqr;
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minIndex = index;
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nearestPoint = nearHit.rawPoint();
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}
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}
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}
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template
|
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<
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class Face,
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template<class> class FaceList,
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class PointField,
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class PointType
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>
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bool
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Foam::treeDataPrimitivePatch<Face, FaceList, PointField, PointType>::
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intersects
|
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(
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const label index,
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const point& start,
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const point& end,
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point& intersectionPoint
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) const
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{
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// Do quick rejection test
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if (cacheBb_)
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{
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const treeBoundBox& faceBb = bbs_[index];
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if ((faceBb.posBits(start) & faceBb.posBits(end)) != 0)
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{
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// start and end in same block outside of faceBb.
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return false;
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}
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}
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const pointField& points = patch_.points();
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const face& f = patch_[index];
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const point fc = f.centre(points);
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const vector dir(end - start);
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pointHit inter = patch_[index].intersection
|
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(
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start,
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dir,
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fc,
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points,
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intersection::HALF_RAY
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);
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if (inter.hit() && inter.distance() <= 1)
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{
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// Note: no extra test on whether intersection is in front of us
|
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// since using half_ray
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intersectionPoint = inter.hitPoint();
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return true;
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}
|
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else
|
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{
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return false;
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}
|
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}
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// ************************************************************************* //
|