The OpenSCAD Customizer lets you adjust parameters and variable values without editing the program file. The comments from the program are used as descriptions for the parameters.
To allow the dollhouse roof's pitch to be specified in degrees, a bit of maths was actually required (see the hroof calculation). Using the polyhedron() function was not entirely trivial either.
// height chimney (mm)
h=70;
// width chimney (mm)
b=80;
// depth chimney (mm)
t=60;
// thickness chimney wall (mm)
d=5;
// inclination of roof (in degrees)
a=40; // [0:89]
/* [Hidden] */
// sin a = h / c
// c = sqrt((b/2)^2+h^2)
// solve h=sin(a)*sqrt(b^2/4+h^2) for h
hroof = b * sin(a)/(2 *sqrt(1 - sin(a)*sin(a)));
difference() {
// chimney
cube([b, t, h]);
union() {
// inner cube to remove
translate([d, d, 0])
cube([b-2*d, t-2*d, h]);
roof(b, t, hroof);
}
}
module roof(b, t, h){
polyhedron(
points=[[0,0,0], [0,t,0], [b,t,0], [b,0,0], [b/2,0,h], [b/2,t,h]],
faces=[[0,1,2,3],[5,4,3,2],[0,4,5,1],[1,5,2],[0,3,4]]
);
}
