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== Build A Round Hole Feature
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The ROUNDHOLE sample program demonstrates how to create a STEP 
round hole feature.  This program builds a sample product and then
attaches a round hole feature to it.  The program just creates the
parametric description for the feature (circular profile swept along
a linear path) and gives it a flat bottom condition.

We do not have any CAD geometry in this example, but the code also
shows how to associate a feature with advanced_face instances on the
product geometry.

 "roundhole_out.stp" contains the sample output from this program.

This program creates the data set and saves it as a STEP Part 21
file called "output_file.stp".  This is a text file, so you can
look at it with a text editor or the STEP Part 21 file browser to
see how the information is represented.
