Corner bracket for polygonal frame

a parameterized corner and side bracket for constructing polygons. by default, it makes hexagons

the idea is that you use square rod of uniform length to construct a frame, into which you stretch a piece of fabric or something. i used square wooden dowel rods.

the corners have holes for lashing string and for hanging.


in principle, this file is whatever dimension you want. i envisioned it being metric, in mm.

features of OpenSCAD this model prominently uses:
- minkowski summing for rounding
- difference, for cutting
- for loops, for placing the screw holes


known issues:
- the corner tabs are NOT correctly placed. they are approximately correct, but as you change the angle, you get some error. was pretty much correct for 6 sides (hexagon).
- stupid things happen if the roundednesses are too high. namely, for the tabs, a roundedness that's too high will result in no tabs at all.

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magic constants:
- no known magic constants at this time. amazin