G2—— Curvature continuity: refers to the point-to-point continuity of a surface or curve, and its curvature analysis results are continuously changing.

Judgment method: Curvature analysis is carried out on the curve, and the curvature curve is continuous without breakpoints. Plane zebra crossing analysis shows that all zebra crossings are smooth and have no sharp corners.

Mathematical explanation: the intersection line between a curve or any plane and a surface is continuous everywhere, and the second derivative is continuous.