Control points may be moved, either individually, or as a group.

To move an individual control point:

§   Click and drag the control point to a new location.

To move multiple control points:

§   Select multiple control points using the selection box or the mouse and  Shift key

§   Click on any control point from the selection and drag the selection to a new location.

It is possible to change values for control points numerically by double clicking on the control point.

A small dialog box appears containing data about the control point. You may select and edit any of the control point's coordinates, or its weighting value. You can also change these values in the table in the Control Points window.

See also Moving a Group of Control Points on page 133.

Any group or individual control point may be constrained in its movement by holding down the Shift key while dragging the control points. The constraint restricts movement to the vertical or horizontal directions. If you release the shift key, you are returned to unconstrained movement.

If a surface is symmetrical, its control points are constrained to lie all on one side of the centreline. You can override this constraint by holding down the Ctrl key while dragging the point.

Maxsurf has a built-in facility to allow you to have your control points automatically snap to an evenly spaced alignment grid while they are being moved. You can control the spacing and use of this alignment grid with the Snap To Grid command from the Controls menu. To specify an alignment grid:

§   Choose Snap To Grid from the Controls menu

§   Click the On button and enter a value for the spacing of the alignment grid

§   Click the OK button

The alignment grid is based around the current Zero Point and will change as the Zero Point changes. For this reason it is advisable to lock the Zero Point when using the Snap to Grid option.

Snap to Grid only affects control point movements made with the mouse or arrow keys. Fairing commands are not affected.