And yet another twist, is that a DC "Plane" does not fit the geometrical definition of a "Plane". It is not necessarily a "Flat Plane", and thus, how to flatten it for this purpose.

Yes, DesignCAD planes are warpable.

I have observed the following general rules.

1.

**If** a DesignCAD plane is warped, it consists of more than 4 points. Remember for DC planes, point 1 and point n are the same. So for the most basic case, a triangular facet is four points (n = 4) and is by definition a proper mathematical plane (provided you're not tricking it, aka improper planes, another topic.)

2.

**If** a DesignCAD plane is warped, DesignCAD will create a subset of pure mathematical planes (n-3). So a warped rectangular DC plane (5 points, n = 5), will consists of 5-3=2 proper mathematical planes:

facet 1: points 1, 2, 3, 1

facet 2 points n-2, n-1, n, n-2

Note I say

**If**. DesignCAD planes with more than 4 points may be mathematical planes but not necessarily, so you have to test the points when n > 4.