- Select a Spline ROI.
- Click to add control points and draw the spline.
- A spline can be closed clicking on the first control point or double clicking when adding the last control point.
- Click and drag the control points to update the spline.
- Shift+click allow adding new control points once the spline is closed.
- Ctrl+click allow deleting control points once the spline is closed.
- Use the "Resolution" slider to change the spline resolution (number of line segments). Resolution is not applicable to Linear spline.
- User the "Scale" slider to change the Cardinal spline scale. A Catmull-Rom spline is a Cardinal spline with scale set to 50% and Linear spline is a Cardinal spline with scale set to 0%.
- It is not allowed to add/removed control points to/from BSpline once it is closed.
- Press Backspace or Delete to delete the last control point when drawing