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63 lines
1.5 KiB
Markdown
63 lines
1.5 KiB
Markdown
# rotate_p
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Rotates a point `a` degrees around an arbitrary axis. It behaves as the built-in `rotate` module
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## Parameters
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- `point` : A 3D point `[x, y, z]` or a 2D point `[x, y]`.
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- `a` : If it's `[deg_x, deg_y, deg_z]`, the rotation is applied in the order `x`, `y`, `z`. If it's `[deg_x, deg_y]`, the rotation is applied in the order `x`, `y`. If it's`[deg_x]`, the rotation is only applied to the `x` axis. If it's an number, the rotation is only applied to the `z` axis.
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## Examples
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You can use the code below to create a line.
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include <rotate_p.scad>;
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hull() {
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sphere(1);
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rotate([0, -45, 45])
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translate([20, 0, 0])
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sphere(1);
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}
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The following code has the same effect.
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include <rotate_p.scad>;
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point = [20, 0, 0];
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a = [0, -45, 45];
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hull() {
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sphere(1);
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translate(rotate_p(point, a))
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rotate(a)
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sphere(1);
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}
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The `rotate_p` function is useful in some situations. For example, you probably want to get all points on the path of a spiral around a sphere.
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include <rotate_p.scad>;
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radius = 40;
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step_angle = 10;
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z_circles = 20;
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points = [for(a = [0:step_angle:90 * z_circles])
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rotate_p(
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[radius, 0, 0],
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[0, -90 + 2 * a / z_circles, a]
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)
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];
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// Once you get all points on the path, you can place anything at each point.
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// I just place a sphere as a simple demonstration.
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for(p = points) {
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translate(p)
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sphere(1);
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}
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%sphere(radius);
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