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module convex2dSimple() {
hull() {
translate([15,10]) circle(10);
circle(10);
}
}
module concave2dSimple() {
hull() {
translate([15,10]) square(2);
translate([15,0]) square(2);
square(2);
}
}
module convex2dHole() {
hull() {
translate([15,10,0]) circle(10);
difference() {
circle(10);
circle(5);
}
}
}
module hull2dForLoop() {
hull() {
for(x = [0,10])
for(y=[0,10])
translate([x,y]) circle(3);
}
}
module hull2null() {
hull() {
square(0);
circle(0);
}
}
convex2dHole();
translate([40,0,0]) convex2dSimple();
translate([0,-20,0]) concave2dSimple();
translate([30,-25,0]) hull2dForLoop();
hull2null();
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