Function P = smallsquare(p,u,v,s,o)
P = smallsquare(p,P0,s,o)
returns a polygon P representing a small square with side
length s, drawn around the given point p. One side is along
vector u, the other along vector u. Instead of input of u and
v directly, a polygon P0 may be given, from which is calculated:
u = P0(2,:) - P0(1,:),
v = P0(end,:) - P0(1,:).
For nonzero values of o, the returned polygon P is offsetted
with distance o from point p perpendicularily to the plane
defined by u and v.
Input variables p, u and v are arrays of 1 row and 3 columns.
Input variable P0 has at least 3 rows, and has 3 columns.
Output variable P has 4 rows and 3 columns.
The validity of the input is not checked!
(c) 2026 fabien van mook
2026.08.20 release of this file within package "fvm-geometry" under GNU GPLv3+
