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add example

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Justin Lin
2020-10-29 17:29:57 +08:00
parent 69976d834c
commit 5d913847b8
1 changed files with 26 additions and 4 deletions
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30
src/experimental/catmull_rom_spline.scad
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@@ -12,9 +12,7 @@ function _catmull_rom_spline_4pts(t_step, points, tightness) =
bezier_curve(t_step, [points[1], p1x, p2x, points[2]]); bezier_curve(t_step, [points[1], p1x, p2x, points[2]]);
function catmull_rom_spline(t_step, points, tightness = 0) = function catmull_rom_spline(t_step, points, tightness = 0) =
let( let(leng = len(points))
leng = len(points)
)
concat( concat(
[ [
for(i = [0:leng - 4]) for(i = [0:leng - 4])
@@ -25,4 +23,28 @@ function catmull_rom_spline(t_step, points, tightness = 0) =
], ],
[points[leng - 2]] [points[leng - 2]]
); );
/*
use <experimental/catmull_rom_spline.scad>;
use <hull_polyline3d.scad>;
pts = [
[280, 20, 10],
[150, 80, -100],
[20, 140, 50],
[280, 140, 20],
[150, 210, 90],
[20, 280, 0]
];
#for(pt = pts) {
translate(pt)
sphere(10);
}
t_step = 0.1;
tightness = 0;
points = catmull_rom_spline(t_step, pts, tightness);
hull_polyline3d(points, 5);
*/