相交和修剪
交集
// python_points_5 is a set of Points generated with
// a Python script found in Chapter 12, Section 10
surf = NurbsSurface.ByPoints(python_points_5, 3, 3);
WCS = CoordinateSystem.Identity();
pl = Plane.ByOriginNormal(WCS.Origin.Translate(0, 0,
0.5), WCS.ZAxis);
// intersect surface, generating three closed curves
crvs = surf.Intersect(pl);
crvs_moved = crvs.Translate(0, 0, 10);修剪
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