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47 lines
1.5 KiB
Markdown
47 lines
1.5 KiB
Markdown
# archimedean_spiral_extrude
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Extrudes a 2D shape along the path of an archimedean spiral.
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When using this module, you should use points to represent the 2D shape. If your 2D shape is not solid, indexes of triangles are required. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib-polysections.html) for details.
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Dependencies: `rotate_p`, `archimedean_spiral`, `cross_sections`, `polysections`.
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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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- `arm_distance`, `init_angle`, `point_distance`, `num_of_points` and `rt_dir` : See [archimedean_spiral](https://openhome.cc/eGossip/OpenSCAD/lib-archimedean_spiral.html) for details.
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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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- `triangles` : `"SOLID"` (default), `"HOLLOW"` or user-defined indexes. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib-polysections.html) for details.
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## Examples
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include <archimedean_spiral.scad>;
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include <rotate_p.scad>;
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include <cross_sections.scad>;
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include <polysections.scad>;
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include <archimedean_spiral_extrude.scad>;
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shape_pts = [
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[5, 0],
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[5, 4],
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[4, 4],
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[4, 2],
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[-4, 2],
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[-4, 4],
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[-5, 4],
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[-5, 0]
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];
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archimedean_spiral_extrude(
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shape_pts,
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arm_distance = 15,
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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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scale = [1, 5]
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);
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