How to make an incline prism with POVray ?

I can find in User's guide how to make a prism with a base in a plan, and
going 'upward' (i.e if the base is in x,z plan, the moving axis of the prism
is along the y vector.

Buit how can I do a prism inclined like the Pise tower ? (with, for instance
a moving vector incline with 20 degrees to an axis..).

Is my only choice is to use a mesh or a straight prism cut by 'inclined
boxes' ? That would be very long and tedious compared to my simple polygonal
base and prism shape...

I could use SPatch, but I need a rigorous definition of the polygonal base,
and in SPatch I can't define coordinates other than by moving the cursor and
counting the grid marks....

Thanks you for your help.

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