# Insert Knots

[Insert Knots] command inserts a knot into u or v parameter space of a free form surface.

## Step 1

For the prompt "Specify Surface" , select a free form surface to add knots.

## Step 2

For the prompt "Specify knots" , specify the knot positions to add knots by pressing mouse. Isoparameteric curve will be displayed following the mouse cursor movement. Press `Enter` key to finish the locating.

- Pressing `B` key,

  both knots at u and v parameter space will be added.

- Pressing `T` key,

  parameter kind(u or v) will be changed.

- Pressing `U` key,

  changes the parameter kind to U.

- Pressing `V` key,

  changes the parameter kind to V.