Forgive me. I have not had a chance to look at SAC; mainly because I can't think of what I would do with it.
What can you do with SAC that can't be done with an OOTB component?
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The simple answer is you can do things that can't be done with OOTB assemblies.
Fred Ernst had a novel approach for one in this thread: http://forums.autodesk.com/t5/AutoCAD-Civil-3D-Gen
Think of a gang of mowers following a dozer that plane and shape the ground. Each mower is linked to the adjacent mower with a link that prevents it from deflecting more than a certain amount. As long as the ground is flat enough the mowers don't change the ground, but if there are steep dips or mounds the mowers lock and cut the tops or (magically) fill the dips.
Here is the opposite approach, my first one I created was a very simple daylight subassembly. We just wanted one with basic slope input but allows us to apply +/- to either slope so we can force it to go down even if it is a cut situation.
Oh that's funny.
"You'll never grow old if you continue to try new things, continue to learn...and never mind being contradicted."
Think that was Twain.
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