Perhaps you recall the tools or maybe not; either way they are found on the Options Bar after you select the Floor or Roof (just to the right of 'edit').
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If you already hit escape, or need to adjust those points in the future then you can always use the 'modify sub elements' button.
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(That's cool!!!)
Here is what that all looks like in a partial section:
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Then in 3D:
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And as promised: To get the (I know, rather unsightly...) shapes below I placed an eliptical shaft opening at one side and created a generic, in place 'void' family and used the cut the geometry tool to give the multiple curves at the other side. Don't worry, we can create beautiful shapes also!!! Although as shapes go (not roofs) this isn't that bad...
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Thanks for the informative article - enjoy your sense of humour too!
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