public double alphaBeta; // Sum of dihedral angles to a virtual shared triangle
public TopoEdgePair(TopoEdge _edgeA, TopoEdge _edgeB)
{
edgeA = _edgeA;
edgeB = _edgeB;
RHVector3 sharedPoint = null;
RHVector3 p1 = null, p2 = null;
if (edgeA.v1 == edgeB.v1)
{
sharedPoint = edgeA.v1.pos;
p1 = edgeA.v2.pos;
p2 = edgeB.v2.pos;
}
else if (edgeA.v1 == edgeB.v2)
{
sharedPoint = edgeA.v1.pos;
p1 = edgeA.v2.pos;
p2 = edgeB.v1.pos;
}
else if (edgeA.v2 == edgeB.v1)
{
sharedPoint = edgeA.v1.pos;
p1 = edgeA.v1.pos;
p2 = edgeB.v2.pos;
}
else if (edgeA.v2 == edgeB.v2)
{
sharedPoint = edgeA.v2.pos;
p1 = edgeA.v1.pos;
p2 = edgeB.v1.pos;
}
RHVector3 d1 = p1.Subtract(sharedPoint);
RHVector3 d2 = p2.Subtract(sharedPoint);
RHVector3 normal = d1.CrossProduct(d2);
normal.NormalizeSafe();
alphaBeta = normal.AngleForNormalizedVectors(edgeA.faces.First.Value.normal) + normal.AngleForNormalizedVectors(edgeB.faces.First.Value.normal);
if (alphaBeta > Math.PI) // normal was wrong direction
{
alphaBeta = 2 * Math.PI - alphaBeta;
}
}