Method 
Sets the way that the curve is rebuilt.
 Number of Points — Lets you set the number of control points, and the order of the rebuilt curve.
 Refit with Tolerance — The curve is reconstructed, based on the given tolerance, to produce a better curve.
 Uniform Knots — Retains the same number of poles, but the knots are distributed evenly.

No. of Control Points 
(Method set to Number of Points only) Sets the number of control points to be used in the rebuilt curve. 
Order 
(Method set to Number of Points only) Sets the order of the rebuilt curve. Maximum order is 26. 
Maintain Sharp 
(Method set to Refit with Tolerance only) If on, all the sharp corners of a curve will be maintained while the intermediate segments of the curve will be reconstructed. 
Maintain Tangent 
(Method set to Refit with Tolerance only) If on, a complex chain (with a line tangent to a Bspline curve) will be reconstructed such that the end result will still have the line and the Bspline tangent to each other, but the Bspline segment will be reconstructed. 
Keep Original 
If on, the original curve is not deleted upon creation of the replacement curve. 
Tolerance 
(Method set to Refit with Tol only) Sets the maximum distance allowed between the replacement curve and the original curve. To make the replacement curve appear identical to the original, even though its complexity is reduced, experiment with different Tolerance values.
