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48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
# sphere_spiral_extrude
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Extrudes a 2D shape along the path of a sphere 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`, `sphere_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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- `radius` , `za_step`, `z_circles`, `begin_angle`, `end_angle`, `vt_dir`, `rt_dir` : See [sphere_spiral](https://openhome.cc/eGossip/OpenSCAD/lib-sphere_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 <rotate_p.scad>;
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include <cross_sections.scad>;
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include <polysections.scad>;
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include <sphere_spiral.scad>;
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include <sphere_spiral_extrude.scad>;
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function shape_pentagram(r) =
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[
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[0, 1], [-0.224514, 0.309017],
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[-0.951057, 0.309017], [-0.363271, -0.118034],
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[-0.587785, -0.809017], [0, -0.381966],
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[0.587785, -0.809017], [0.363271, -0.118034],
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[0.951057, 0.309017], [0.224514, 0.309017]
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] * r;
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points_triangles = shape_pentagram(2);
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sphere_spiral_extrude(
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shape_pts = points_triangles,
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radius = 40,
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za_step = 2,
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z_circles = 20,
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begin_angle = 90,
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end_angle = 450,
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vt_dir = "SPI_UP",
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scale = 5
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);
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