C-Splines
To parametrically control the shape of a C-spline, you first place point elements on the data points used to create the spline and then assign the appropriate constraints to these points to actually control the shape of the spline. Any constraint that can be assigned to a point can be used.
To find the location of the C-spline's data points, turn on vertices with SHOW VERTEX ON. Before assigning point elements to the spline data points, you should also make sure that splitting is turned off.
 |
By default, Creo Elements/Direct Drafting converts all rational splines in a drawing into B-splines when you load it. The conversion will invalidate any constraints that you have assigned to the data points of these rational splines. Refelem constraints which are assigned directly to spline elements are not invalidated, and will be carried over from the rational spline to the new B-spline.
To prevent spline conversion and the subsequent invalidation of constraints on rational splines, you must enter SPLINE_CONVERSION OFF prior to loading any master part that contains constrained rational splines. Alternatively, you could include this line in the Creo Elements/Direct Drafting pd_def file to permanently disable spline conversion.
|