| Insert Knots icon |
Lets you add a knot point to a B-spline curve. |
| Remove Knots icon |
Lets you remove an existing knot point from a B-spline curve. |
| Method |
The available methods for inserting or removing knots are:
- By Point — (When Insert Knots icon is selected) Lets you insert a knot on a B-spline curve by picking a location on the curve.
- By Parameter — (When Insert Knots icon is selected) Lets you insert a knot at a location that is defined by the B-spline parameter value.
- Single — (When Remove Knots icon is selected) Lets you pick a knot location to remove from the curve. You can pick one at a time.
- By Tolerance — (When Remove Knots icon is selected) Lets you specify a tolerance. The tool will remove as many knots as possible, such that the deviation between the new and the original B-spline curves will not be greater than the input tolerance.
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| Knot Value |
Used with the By Parameter method to specify the location on the curve where a new knot will be inserted. |
| Tolerance |
Used to specify a value for the By Tolerance method. |
| Control Points |
If on, control points are turned on for the selected B-spline curve. Note: You can turn off control points with the Edit Control Points tool.
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Used to insert or remove knots. A knot is a point on the control polygon of a B-spline curve. 
