Most people I know make alignments for pipe design, then pipe network objects if someone demands a 3d model. A few actually make the pipe network for profile labeling. In either case, real Civil engineers design pipes like road centerlines, and walls and every other linear thing I can think of. So my idea is to make the pipe objects in C3D hook to an alignment for plan and profile shape. Have it turn rules completely off, we don't need them when we have designed a profile already. What we do need is the ability to edit a profile and have reaches between real grade breaks straight grade between each other. This thinking extends to many other things. Everything linear in Civil engineering is a (road type) alignment first, then decorated with a section or diameter, or structures or offsets. Its never part based, so don't make the "parts" control how you store the shape of the idtem being designed.
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