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45 lines
1.3 KiB
Markdown
45 lines
1.3 KiB
Markdown
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# cross_sections
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Given a starting cross-section, points and angles along the path, this function will return all cross-sections. Combined with the `polysections` module, you can create a specific path extrusion.
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It depends on the `rotate_p` function. Remember to include "rotate_p.scad".
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## Parameters
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- `shape_pts`: A list of points represent a shape. See the example below.
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- `path_pts` : A list of points represent the path.
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- `angles` : A list of angles. Each point should have a corresponding angle used to rotate the 2D shape.
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- `twist`: The number of degrees of through which the shape is extruded.
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- `scale` : Scales the 2D shape by this value over the length of the extrusion. Scale can be a scalar or a vector.
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## Examples
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include <rotate_p.scad>;
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include <polysections.scad>;
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include <cross_sections.scad>;
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include <archimedean_spiral.scad>;
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shape_pts = [
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[-2, -10],
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[-2, 10],
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[2, 10],
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[2, -10]
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];
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pts_angles = archimedean_spiral(
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arm_distance = 20,
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init_angle = 180,
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point_distance = 5,
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num_of_points = 100
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);
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pts = [for(pt_angle = pts_angles) pt_angle[0]];
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angles = [
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for(i = [0:len(pts_angles) - 1]) [90, 0, pts_angles[i][1]]
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];
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polysections(
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cross_sections(shape_pts, pts, angles, twist = 180, scale = 0.1)
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);
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