use of `at` in get_spline and get_surface is not robust

dewittpe / cpr

Control Polygon Reduction: Methods for quick and efficient placement of internal knots for B-splines and tensor products of B-splines.

http://www.peteredewitt.com/cpr/

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Open dewittpe opened 10 months ago

dewittpe commented 10 months ago

The current coding is great if the at arg is omitted but will almost certainly fail if specified.

improve coding and documentation.