And its source code is full of gems (I especially like the use of OpenCL kernels). What an incredible gift… thank you for sharing!

Hugo

(BTW, thanks for the warm welcome to the open source club. However, this isn’t the first project of mine going open source. See https://github.com/zaggo for my other projects.).

Thanks again, for me and on behalf of all kinds of users, for sharing your code!

hack on,
- Far McKon
Nerd Herder for MakerBot Software Dept

// truncated teardrop
module teardrop (r=8, h=20) {
render()
rotate([-270, 0, 90]) {
cylinder(r=r, h=h, $fn=64);
translate([-(r * sqrt(2)) / 2, 0, 0]) cube([r * sqrt(2), r * sqrt(2) / 2, h]);
difference() {
rotate([0, 0, 45]) cube([r, r, h]);
translate([-r, r, -1]) cube([2 * r, r, h + 2]);
}
}
}

// tapered truncated teardrop
module teardrop2(r1 = 10, r2 = 5, h=5) {
difference() {
cube([r1, r1, h]);
translate([r1 * sqrt(2), 0, 0]) rotate([0, 0, 45]) rotate([0, -atan((r1 - r2) / h), 0]) translate([0, 0, -r1]) cube([r1 * 2, r1 * 2, h * (r1)]);
translate([r1, r1, 0]) rotate([0, 0, 90]) rotate([0, -atan((r1 - r2) / h), 0]) translate([0, 0, -r1]) cube([r1 * 2, r1 * 2, h * (r1)]);
translate([r1, -r1, 0]) rotate([0, 0, 0]) rotate([0, -atan((r1 - r2) / h), 0]) translate([0, 0, -r1]) cube([r1 * 2, r1 * 2, h * (r1)]);
}
cylinder(r1 = r1, r2 = r2, h=h);
}

The best way to turn my teardrop shapes into truncated ones is to intersect them with a square, but I’ve moved on from teardrops to hexagons and octagons because they have a more predictable relationship between the inner and outer diameters, with fewer variables to worry about.