When using the Length option to obtain a drafted surface, if two base curves are not plane, the transition corresponding to their connection on the opposite side of the sweep surface can have tangency or positional discontinuity depending on whether you respectively had tangency or positional discontinuity in the connection point.
The illustrations below display two cases in which you get discontinuity when using the Length option:
A rectangle has
been sweeped in a direction not perpendicular to the
plane. You had positional continuity in the base
contour, but now you have positional discontinuity on
the "top" contour. |
A rounded rectangle has been sweeped in a direction not perpendicular to the plane. You had tangency continuity in the base contour, but now you have tangency discontinuity on the "top" contour. |