Add a check.

2dda048b · Ilya Portnov · 73cd215c · 2dda048b
--- a/utils/surface/gordon.py
+++ b/utils/surface/gordon.py
@@ -36,6 +36,11 @@ def gordon_surface(u_curves, v_curves, intersections, metric='POINTS', u_knots=N
    if (u_knots is None) != (v_knots is None):
        raise Exception("u_knots and v_knots must be either both provided or both omited")

+    if any(c.is_rational() for c in u_curves):
+        raise Exception("Some of U-curves are rational. Rational curves are not supported for Gordon surface.")
+    if any(c.is_rational() for c in v_curves):
+        raise Exception("Some of V-curves are rational. Rational curves are not supported for Gordon surface.")
+
    intersections = np.array(intersections)

    if u_knots is not None: