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Fixes for faster construction of sphere()

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Garth Minette 2020-12-27 21:54:31 -08:00
parent f30e46e3ac
commit fb0de58c7f
2 changed files with 17 additions and 14 deletions
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29
shapes.scad
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@ -1159,6 +1159,14 @@ module torus(
// Creates a spheroid object, with support for anchoring and attachments.
// This is a drop-in replacement for the built-in `sphere()` module.
// When called as a function, returns a [VNF](vnf.scad) for a spheroid.
// The exact triangulation of this spheroid can be controlled via the `style=`
// argument, where the value can be one of `"orig"`, `"aligned"`, `"stagger"`,
// `"octa"`, or `"icosa"`:
// - `style="orig"` constructs a sphere the same way that the OpenSCAD `sphere()` built-in does.
// - `style="aligned"` constructs a sphere where, if `$fn` is a multiple of 4, it has vertices at all axis maxima and minima. ie: its bounding box is exactly the sphere diameter in length on all three axes. This is the default.
// - `style="stagger"` forms a sphere where all faces are triangular, but the top and bottom poles have thinner triangles.
// - `style="octa"` forms a sphere by subdividing an octahedron (8-sided platonic solid). This makes more uniform faces over the entirety of the sphere, and guarantees the bounding box is the sphere diameter in size on all axes. The effective `$fn` value is quantized to a multiple of 4, though. This is used in constructing rounded corners for various other shapes.
// - `style="icosa"` forms a sphere by subdividing an icosahedron (20-sided platonic solid). This makes even more uniform faces over the entirety of the sphere. The effective `$fn` value is quantized to a multiple of 5, though.
// Arguments:
// r = Radius of the spheroid.
// d = Diameter of the spheroid.
@ -1200,21 +1208,16 @@ module spheroid(r, d, circum=false, style="aligned", anchor=CENTER, spin=0, orie
{
r = get_radius(r=r, d=d, dflt=1);
sides = segs(r);
vsides = ceil(sides/2);
attachable(anchor,spin,orient, r=r) {
if (style=="orig") {
rotate_extrude(convexity=2,$fn=sides) {
difference() {
oval(r=r, circum=circum, realign=true, $fn=sides);
left(r) square(2*r,center=true);
}
}
} else if (style=="aligned") {
rotate_extrude(convexity=2,$fn=sides) {
difference() {
oval(r=r, circum=circum, $fn=sides);
left(r) square(2*r,center=true);
}
}
merids = [ for (i=[0:1:vsides]) 90-(i+0.5)*180/(vsides+1) ];
path = [
let(a = merids[0]) [0, r*sin(a)],
for (a=merids) r * [cos(a), sin(a)],
let(a = select(merids,-1)) [0, r*sin(a)]
];
rotate_extrude(convexity=2,$fn=sides) polygon(path);
} else {
vnf = spheroid(r=r, circum=circum, style=style);
vnf_polyhedron(vnf, convexity=2);

2
version.scad
View File

@ -8,7 +8,7 @@
//////////////////////////////////////////////////////////////////////
BOSL_VERSION = [2,0,484];
BOSL_VERSION = [2,0,485];
// Section: BOSL Library Version Functions