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ACIS prefers that curves and surfaces generally be G2 continuous, but will allow G1 continuity at the knots of curves and surfaces. The
C++ class
discontinuity_info records discontinuity information. It is used internally by
ACIS in the curve and surface extension and intersection algorithms.
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Some modeling operations (such as offsetting, shelling, and blending) may fail on surfaces that are not G1 continuous. The evaluation of mass properties in
ACIS requires that curves be C1 continuous.
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Refer to Chapter 3,
Math Foundation, for definitions of the types and degrees of continuity.
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