Refit Orthogonal Curves

Having set up knuckle and tangent curves with their associated angle curves the user can discard the current orthogonal curves by switching them off.

Refit Orthogonal Curves

1. Select the icon, which will display the Select Curves dialog box and select the required set of orthogonal curves from the pulldown list.

2. Select the required curves or use the Range button, to select a range of curves, then click the Off button.

   Then using just the control and angle curves, by deselecting all the options in the interpolation part of the Faring dialog, a new set of orthogonal curves can be interpolated.

This time when a data point is interpolated from a knuckle or tangent curve that has an associated angle curve, the data point will be assigned an angle taken from the angle curve. When a curve is fit, using the prefit icon, the fitting algorithm will ensure that the curve passes through these data points with the interpolated angles.

The sections should now be used to interpolate waterlines and buttocks and the fairness of these examined. Again in critical regions these should be closely spaced. If these show further fairing to be necessary then the user should ascertain which 3D curves control the unfair region and modify these. It may also be necessary to introduce extra localized curves.

The sections should then be re-fitted from the 3D curves and the waterlines and buttocks re-interpolated from the sections.

Figure 3:26. Select Curves Dialog.