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update doc

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Justin Lin 2022-07-19 10:18:26 +08:00
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commit 97860fdf67
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docs/lib3x-fibonacci_lattice.md
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@ -1,6 +1,6 @@
# fibonacci_lattice
Creates visually even spacing of n points on the surface of the sphere. Nearest-neighbor points will all be approximately the same distance apart. There're 8 spirals on the sphere.
Creates visually even spacing of n points on the surface of the sphere. Nearest-neighbor points will all be approximately the same distance apart. There're max 21 spirals on the sphere.
(It's called "visually even spacing" because only the vertices of the 5 [Platonic solids](https://en.wikipedia.org/wiki/Platonic_solid) can be said to be truly evenly spaced around the surface of a sphere.)
@ -30,9 +30,6 @@ Creates visually even spacing of n points on the surface of the sphere. Nearest-
![fibonacci_lattice](images/lib3x-fibonacci_lattice-1.JPG)
use <fibonacci_lattice.scad>
use <polyline_join.scad>
n = 200;
radius = 20;
pts = fibonacci_lattice(n, radius);
@ -41,16 +38,17 @@ Creates visually even spacing of n points on the surface of the sphere. Nearest-
translate(p)
sphere(1);
}
sphere(radius);
spirals = [for(j = [0:7])
[for(i = j; i < len(pts); i = i + 8) pts[i]]
sphere(radius * 0.9);
spirals = [for(j = [0:20])
[for(i = j; i < len(pts); i = i + 21) pts[i]]
];
for(spiral = spirals) {
polyline_join(spiral)
sphere(.5);
sphere(.25);
}
![fibonacci_lattice](images/lib3x-fibonacci_lattice-2.JPG)