Another round corner cube library

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I wrote this library while I was working on an OpenSCAD project and thought it might be useful for someone else. It utilizes the built-in $fn functionality of spheres and cylinders to smooth out cube corners. Version: 2014-10-05 Performance updates Another Round Corner Cube Library by Towa Version: 2014-10-05 Instructions: rcorn_cube(size, r, f, center) size : Size of the object like in cube-function r as scalar : Corner radius of a sphere r[r, h] : Corner radius of a sphere and height of an additional, overlayed cylinder r[r, h, t] : Corner radius of a sphere, height of an additional cylinder and vertical translation of the cylinder f : Number of facets of sphere and cylinder center : False if the object should not be centered Examples: translate([0, -60, 0]) rcorn_cube([50, 40, 30], 10, 8); translate([0, 0, 0]) rcorn_cube([50, 40, 30], [8, 4], 24); translate([0, 60, 0]) rcorn_cube([50, 40, 30], [10, 5, -5], 64); // Include in your project with "use "; for (i = [0:2]) { translate([i*70, -60, 0]) rcorn_cube([50, 40 - 2*i, 25 - 4*i], 10, fn = 8, center = false); translate([i*70, 0, 0]) rcorn_cube([50, 40 - 4*i, 25 - 4*i], [8, 4], 24); translate([i*70, 60, 0]) rcorn_cube([50, 40 - 6*i, 25 - 6*i], [10, 5, -5], 64); } function rs = radius sphere() { r0 / cos(90 / ceil($fn / 2)); } function redg edge radius sphere low res() { (ceil($fn / 2) % 2 == 0) ? r0 : rs; } // Corner Translations for the eight corners of a cube hull() { for (i = [0:7]) { corner_transl(i, shm) // Translate to the eight corners of a cube intersection() { // Keep box inside boundaries in any case mirror([(floor(i ) % 2 == 0) ? 0 : 1, (floor(i/2) % 2 == 0) ? 0 : 1, 0]) rotate([0, 0, 45]) union() { // Point towards the middle of sphere and optional cylinder sphere(r = rs, $fn = $fn); if ((len(r) >= 2) && (r[1] > 0)) { translate([0, 0, (len(r) >= 3) ? r[2] : 0]) cylinder(h = 2*r[1], r = redg, $fn = $fn, center = true); } } corner_transl(i, shlim/2) // Translate to the eight corners of a cube cube(shlim, center = true); } }