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ENH: tetrahedron : handle degenerate tets

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This commit is contained in:
mattijs
2010-12-08 16:00:59 +00:00
parent a964515708
commit 6cd78ff368
1 changed files with 32 additions and 3 deletions
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35
src/OpenFOAM/meshes/primitiveShapes/tetrahedron/tetrahedronI.H
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@ -21,12 +21,11 @@ License
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
Description
\*---------------------------------------------------------------------------*/
#include "triangle.H"
#include "IOstreams.H"
#include "triPointRef.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
@ -152,7 +151,37 @@ inline Point tetrahedron<Point, PointRef>::circumCentre() const
vector ba = b ^ a;
vector ca = c ^ a;
return a_ + 0.5*(a + (lambda*ba - mu*ca)/((c & ba) + ROOTVSMALL));
vector num = lambda*ba - mu*ca;
scalar denom = (c & ba);
if (Foam::mag(denom) < ROOTVSMALL)
{
// Degenerate tet. Use test of the individual triangles.
{
point triCentre = triPointRef(a_, b_, c_).circumCentre();
if (magSqr(d_ - triCentre) < magSqr(a_ - triCentre))
{
return triCentre;
}
}
{
point triCentre = triPointRef(a_, b_, d_).circumCentre();
if (magSqr(c_ - triCentre) < magSqr(a_ - triCentre))
{
return triCentre;
}
}
{
point triCentre = triPointRef(a_, c_, d_).circumCentre();
if (magSqr(b_ - triCentre) < magSqr(a_ - triCentre))
{
return triCentre;
}
}
return triPointRef(b_, c_, d_).circumCentre();
}
return a_ + 0.5*(a + num/denom);
}