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PolyCAD

Name and Colour

Specifies the option text identifier and color of the entity.

Name The optional text identifier of the entity
Colour The colour of the entity. Clicking in the colored square will display the colour selection dialogue box.

Continuity

Selects the algorithm used to generate the BSpline curve through the definition points of the curves.

1st Order Generates a curve based on piecewise BSpline segments which is C1 or continuous in at least the first derivative.
2nd Order Generates a fitted BSpline curve which is C2 or continuous in at least the second derivative.
2nd Order Piecewise Generates a curve based on piecewise BSpline segments which is C2 or continuous in at least the second derivative.
Account for chord length The knot vectors of the BSpline curves will account for differences in the chord length distances between definition points.

End Conditions

Selects the end condition arrangement applied at the start and end points of the curve.

Natural The end of the curve is based on the natural end condition, i.e. the second derivative reduces to zero at the end point.
Bessel The end point of the curve is based on the bessel end condition, i.e. curve shape is parabolic.

Points

The parametric definition of the control polygon allowing the coordinate components of each point to be manipulated. See Editing Curve Control Points Numerically.