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https://github.com/DJSundog/NopSCADlib.git
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64 lines
2.1 KiB
OpenSCAD
64 lines
2.1 KiB
OpenSCAD
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//
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// NopSCADlib Copyright Chris Palmer 2018
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// nop.head@gmail.com
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// hydraraptor.blogspot.com
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//
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// This file is part of NopSCADlib.
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//
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// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
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// GNU General Public License as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along with NopSCADlib.
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// If not, see <https://www.gnu.org/licenses/>.
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//
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//! 3D offset using `minkowski` with a `sphere`, so very slow if `$fn` is not kept small. The offset can be positive or negative.
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//!
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//! Can be used to round corners. Positive offsets will round convex corners, negative offsets round concave corners. To round both use [`round_3D()`](#round).
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//!
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//! If `chamfer_base` is true then the bottom edge is made suitable for 3D printing by chamfering when the angle gets shallower than 45 degrees.
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include <../core.scad>
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module offset_3D(r, chamfer_base = false) { //! Offset 3D shape by specified radius ```r```, positive or negative.
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module ball(r)
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if(chamfer_base)
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rotate_extrude()
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intersection() {
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rotate(180)
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teardrop(0, r);
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translate([0, -r])
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square([r, 2 * r]);
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}
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else
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sphere(r);
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if(r > 0)
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minkowski() {
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children();
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ball(r);
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}
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else
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if(r < 0)
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render() difference() {
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cube(inf / 2, center = true);
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minkowski() {
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difference() {
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cube(inf, center = true);
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children();
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}
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ball(-r);
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}
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}
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else
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children();
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}
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