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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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59
src/meshTools/AMIInterpolation/faceAreaIntersect/faceAreaIntersect.C
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@ -46,6 +46,7 @@ void Foam::faceAreaIntersect::triSliceWithPlane
label nPos = 0; label nPos = 0;
label posI = -1; label posI = -1;
label negI = -1; label negI = -1;
label copI = -1;
forAll(tri, i) forAll(tri, i)
{ {
d[i] = ((tri[i] - p.refPoint()) & p.normal()); d[i] = ((tri[i] - p.refPoint()) & p.normal());
@ -54,6 +55,7 @@ void Foam::faceAreaIntersect::triSliceWithPlane
{ {
d[i] = 0.0; d[i] = 0.0;
nCoPlanar++; nCoPlanar++;
copI = i;
} }
else 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 // all points above cutting plane - add triangle to list
tris[nTris++] = tri; tris[nTris++] = tri;
} }
else if ((nPos == 2) || ((nPos == 1) && (nCoPlanar == 1))) else if ((nPos == 2) && (nCoPlanar == 0))
{ {
// 2 points above plane, 1 below // 2 points above plane, 1 below
// resulting quad above plane split into 2 triangles // resulting quad above plane split into 2 triangles
@ -95,25 +101,48 @@ void Foam::faceAreaIntersect::triSliceWithPlane
setTriPoints(tri[i1], tri[i2], p02, nTris, tris); setTriPoints(tri[i1], tri[i2], p02, nTris, tris);
setTriPoints(tri[i1], p02, p01, 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 // point above the plane
label i0 = posI; label i0 = posI;
// indices of remaining points if (nCoPlanar == 0)
label i1 = d.fcIndex(i0); {
label i2 = d.fcIndex(i1); // 1 point above plane, 2 below
// determine the two intersection points // indices of remaining points
point p01 = planeIntersection(d, tri, i0, i1); label i1 = d.fcIndex(i0);
point p02 = planeIntersection(d, tri, i0, i2); label i2 = d.fcIndex(i1);
// forget quad below plane // determine the two intersection points
// - add triangle above plane to list point p01 = planeIntersection(d, tri, i0, i1);
setTriPoints(tri[i0], p01, p02, nTris, tris); point p02 = planeIntersection(d, tri, i0, i2);
// forget quad below plane
// - add triangle above plane to list
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 else
{ {