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An imported datum curve can consist of one or more segments. Multiple segments are not necessarily connected.
The From File option imports a datum curve from a Pro/ENGINEER .ibl, IGES, SET, or VDA file. Pro/ENGINEER does not automatically combine the curves imported using From File into a composite curve.
Pro/ENGINEER reads all the curves from an IGES or SET file, then converts them to 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.
Also do a search on:
Example: Sample Datum Curve File
A simple example using arclength blending is given in the help.
PTC documentation is extremely poor on ibl files, it's hard to find what arcwise blending and pointwise blending is.
From experience for pointwise blending the number of data points per section must be the same, if not use arclength (i.e. blending from one line segment to another).
One interesting thing occurs if you import curves from file and import an iges file. If you then go in and redefine to edit the datum-curve file Pro/E will write a file called feat_1111.ibl
You can use this to see ibl structure for yourself...
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