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60 lines
1.6 KiB
Markdown
60 lines
1.6 KiB
Markdown
# golden_spiral_extrude
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Extrudes a 2D shape along the path of a golden 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 [sweep](https://openhome.cc/eGossip/OpenSCAD/lib3x-sweep.html) for details.
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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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- `from` : The nth Fibonacci number you wanna start from.
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- `to` : The nth Fibonacci number you wanna go to.
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- `point_distance` : Distance between two points on the path.
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- `rt_dir` : `"CT_CLK"` for counterclockwise. `"CLK"` for clockwise. The default value is `"CT_CLK"`.
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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 [sweep](https://openhome.cc/eGossip/OpenSCAD/lib3x-sweep.html) for details.
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## Examples
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use <golden_spiral_extrude.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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golden_spiral_extrude(
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shape_pts,
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from = 3,
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to = 10,
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point_distance = 1,
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rt_dir = "CLK",
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twist = 180,
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scale = 0.1
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);
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use <shape_circle.scad>
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use <golden_spiral_extrude.scad>
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$fn = 12;
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shape_pts = concat(
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shape_circle(radius = 3),
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shape_circle(radius = 2)
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);
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golden_spiral_extrude(
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shape_pts,
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from = 5,
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to = 10,
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point_distance = 1,
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scale = 10,
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triangles = "HOLLOW"
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);
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