Rhinoceros

Part 1 Curve continuity

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Position (G0)
The end points of curves share the xyz coordinate.the curves are position continuous (G0) at the ends.
Tangent (G1)
Tangency measures position and curve direction at the ends. The direction is determined by the first and second point on each curve. If these all fall on a line then two curves are tangent (G1) at the ends. Curves and surfaces with G1 continuity are also G0 continuous.
Curvature (G2)
Curvature continuity between two curves measures position, direction, and radius of curvature at the ends. If the radius of curvature is the same at the common end point, curves are curvature continuous (G2). This condition is not easy to determine by just looking at where the points are located. Curves and surfaces with G2 continuity are also G1 and therefore G0 continuous.

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