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add spiral_cube

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Justin Lin 2019-09-14 20:59:50 +08:00
parent 0205686b9f
commit 842bb858c0
1 changed files with 90 additions and 0 deletions
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examples/taiwan/spiral_cube.scad Normal file
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leng = 30;
leng_diff = 3;
min_leng = 2;
model = "Cube"; // [Cube, Base, Both]
module spiral_cube(leng, leng_diff, min_leng) {
thickness = leng_diff / 4.25;
starting_leng = leng + leng_diff * 2 + thickness * 2.5;
half_leng = leng / 2;
pow_leng_diff = pow(leng_diff, 2);
module spiral_stack(current_leng, pre_height = 0, i = 0) {
factor = current_leng / starting_leng;
if(current_leng > min_leng && current_leng > leng_diff) {
translate([0, 0, pre_height])
scale([factor, factor, 1])
children();
rotate(atan2(leng_diff, current_leng - leng_diff))
spiral_stack(
sqrt(pow_leng_diff + pow(current_leng - leng_diff, 2)),
thickness + pre_height,
i + 1
) children();
}
else {
translate([0, 0, pre_height])
scale([factor, factor, (half_leng - pre_height) / thickness])
children();
}
}
module spiral_squares() {
translate([0, 0, -half_leng])
spiral_stack(leng)
translate([0, 0, thickness / 2])
cube([leng , leng, thickness], center = true);
}
module pair_spiral_squares() {
spiral_squares();
mirror([0, 0, 1])
//rotate([180, 0, 0])
spiral_squares();
}
difference() {
cube(leng * 0.99, center = true);
union() {
pair_spiral_squares();
rotate([90, 0, 0]) pair_spiral_squares();
rotate([0, 90, 0]) pair_spiral_squares();
}
}
}
module base(leng) {
$fn = 96;
r = leng / 3;
difference() {
difference() {
sphere(r);
translate([0, 0, -r])
linear_extrude(r)
square(r * 2, center = true);
}
translate([0, 0, leng * sqrt(3) / 2 + leng / 15])
rotate([45, atan2(1, sqrt(2)), 0])
cube(leng * 0.99, center = true);
}
}
if(model == "Cube") {
spiral_cube(leng, leng_diff, min_leng);
} else if(model == "Base") {
base(leng);
} else {
// Because of float precision problems, I roate the base instead of the cube.
spiral_cube(leng, leng_diff, min_leng);
rotate([-45, 0, 0])
rotate([0, -atan2(1, sqrt(2)), 0])
translate([0, 0, -half_leng * sqrt(3) - leng / 15])
base(leng);
}