Part Modeling > Datum Features > Datum Curves > Imported Datum Curves > About Imported Datum Curves
About Imported Datum Curves
An imported datum curve can consist of one or more segments. Multiple segments are not necessarily connected.
The Model > Get Data > Import option imports a datum curve from an .ibl, IGES, SET, or VDA file format. When you import curves using Import, they are not automatically combined into a composite curve.
All the curves from an IGES or SET file are read and then converted into spline curves.
When you import a VDA file, the system reads the VDA spline entities only.
The “.ibl” file format is very much like that of a blend file, except you should precede the coordinates of each segment of the curve with both "begin section" and “begin curve”. Two points in a section define a line, while more than two define a spline.
To connect curve segments, make sure the coordinates of the first point are the same as the last point in the previous section.
You can redefine datum curves that are created from a file, and you can trim or split them with other curves that are imported from a file.