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BUG: Corrected triangle-triangle intersection for AMI

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This commit is contained in:
andy
2011-11-07 12:17:24 +00:00
parent aca450deb3
commit ba1f32c92c
1 changed files with 44 additions and 15 deletions
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41
src/meshTools/AMIInterpolation/faceAreaIntersect/faceAreaIntersect.C
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@ -46,6 +46,7 @@ void Foam::faceAreaIntersect::triSliceWithPlane
label nPos = 0;
label posI = -1;
label negI = -1;
label copI = -1;
forAll(tri, i)
{
d[i] = ((tri[i] - p.refPoint()) & p.normal());
@ -54,6 +55,7 @@ void Foam::faceAreaIntersect::triSliceWithPlane
{
d[i] = 0.0;
nCoPlanar++;
copI = i;
}
else
{
@ -69,12 +71,16 @@ void Foam::faceAreaIntersect::triSliceWithPlane
}
}
if ((nPos == 3) || ((nPos == 2) && (nCoPlanar == 1)))
if
(
(nPos == 3)
|| ((nPos == 2) && (nCoPlanar == 1))
|| ((nPos == 1) && (nCoPlanar == 2)))
{
// all points above cutting plane - add triangle to list
tris[nTris++] = tri;
}
else if ((nPos == 2) || ((nPos == 1) && (nCoPlanar == 1)))
else if ((nPos == 2) && (nCoPlanar == 0))
{
// 2 points above plane, 1 below
// resulting quad above plane split into 2 triangles
@ -95,14 +101,15 @@ void Foam::faceAreaIntersect::triSliceWithPlane
setTriPoints(tri[i1], tri[i2], p02, nTris, tris);
setTriPoints(tri[i1], p02, p01, nTris, tris);
}
else if ((nPos == 1) && (nCoPlanar != 1))
else if (nPos == 1)
{
// 1 point above plane, 2 below
// resulting quad below plane split into 2 triangles
// point above the plane
label i0 = posI;
if (nCoPlanar == 0)
{
// 1 point above plane, 2 below
// indices of remaining points
label i1 = d.fcIndex(i0);
label i2 = d.fcIndex(i1);
@ -116,6 +123,28 @@ void Foam::faceAreaIntersect::triSliceWithPlane
setTriPoints(tri[i0], p01, p02, nTris, tris);
}
else
{
// 1 point above plane, 1 on plane, 1 below
// point indices
label i1 = negI;
label i2 = copI;
// determine the intersection point
point p01 = planeIntersection(d, tri, i0, i1);
// add triangle above plane to list
if (d.fcIndex(i0) == i1)
{
setTriPoints(tri[i0], p01, tri[i2], nTris, tris);
}
else
{
setTriPoints(tri[i0], tri[i2], p01, nTris, tris);
}
}
}
else
{
// all points below cutting plane - forget
}