private void checkPolyVertices(final Point3d[] pnts, final PolyTree ptree) throws Exception {
final Vertex[] verts = ptree.poly_.getVerts();
final boolean[] marked = new boolean[verts.length];
for (int i = 0; i < marked.length; i++) marked[i] = false;
for (final Point3d pnt : pnts) {
int j;
for (j = 0; j < verts.length; j++)
if (!marked[j] && verts[j].coords.epsilonEquals(pnt, 1e-8)) {
marked[j] = true;
break;
}
if (j == verts.length)
throw new Exception("vertex " + pnt + " missing in hull for " + ptree.getName());
}
}
