private void calculateHorizon(point3d eyePnt, HalfEdge edge0, Face face, List <HalfEdge> horizon)
{
// oldFaces.add (face);
deleteFacePoints(face, null);
face.mark = Face.DELETED;
if (debug)
{
Print(" visiting face " + face.getVertexString());
}
HalfEdge edge;
if (edge0 == null)
{
edge0 = face.getEdge(0);
edge = edge0;
}
else
{
edge = edge0.getNext();
}
do
{
Face oppFace = edge.oppositeFace();
if (oppFace.mark == Face.VISIBLE)
{
if (oppFace.distanceToPlane(eyePnt) > tolerance)
{
calculateHorizon(eyePnt, edge.getOpposite(),
oppFace, horizon);
}
else
{
horizon.Add(edge);
if (debug)
{
Print(" adding horizon edge " +
edge.getVertexString());
}
}
}
edge = edge.getNext();
}while (edge != edge0);
}