private void setMidPlane()
{
List <Point3d> facePts = new List <Point3d>();
//plane normals follow caveface
foreach (Point3d p in caveFace.Vertices)
{
facePts.Add(p);
}
foreach (Vector3d mf in caveFace.FaceNormals)
{
toOutside += mf;
}
Point3d planeOrigin = MeshTools.averagePoint(facePts);
toOutside.Unitize();
Plane.FitPlaneToPoints(facePts, out midPlane);
midPlane.Origin = planeOrigin;
if (Vector3d.VectorAngle(midPlane.Normal, toOutside) > Math.PI / 2)
{
midPlane.Flip();
}
}
