can cplane split a polysurface
No, it cannot. A CPlane is not a real object, it is just an abstract representation of a plane. There are many ways to split objects along a CPlane, for example just draw a planar surface on the current CPlane and use that to split the object(s).
It is also possible to use the ‘infinite plane’ option available in a number of commands. For example, if you call Split or BooleanSplit, once you have selected the objects, you type ip at the command line and you will see a bunch of options on the command line of which plane to use.
Finally, it is also possible to use a script as a one-button solution. Here is one from me from a few years ago:
SplitObjsWithCPlane.py (5.6 KB)
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