http://gdl.graphisoft.com/tips-and-tric ... 23-command
The example object used is available in the link at the start of the page.
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Tips & tricks:
Working with CutpolyA (and variants) can be a little difficult to use since that there is no direct way to see them, especially when they don't give you the result that you wish.
But modifying the code to be prism_ compliant then by commenting the first line as seen in following example can make your work process a lot more easier ...
!cutpolyA 4, 3, 1,
prism_ 4, 1,
0.5, 0.5, 7,
0.75, 0.5, 7,
0.75, 0.75, 7,
0.5, 0.75, 7
The API reference documentation is fine the way it is: