29 lines
1.3 KiB
OpenSCAD
29 lines
1.3 KiB
OpenSCAD
//
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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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//! Redefines `sphere()` to always have a vertex on all six half axes I.e. vertices at the poles and the equator and `$fn` a multiple of four.
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//! This ensures `hull` and `minkowski` results have the correct dimensions when spheres are placed at the corners.
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module sphere(r = 1, d = undef) { //! Override ```sphere``` so that has vertices on all three axes. Has the advantage of giving correct dimensions when hulled
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R = is_undef(d) ? r : d / 2;
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rotate_extrude($fn = r2sides4n(R))
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rotate(-90)
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semi_circle(R);
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}
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