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58 lines
1.4 KiB
Markdown
58 lines
1.4 KiB
Markdown
# helix
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Gets all points on the path of a spiral around a cylinder. Its `$fa`, `$fs` and `$fn` parameters are consistent with the `cylinder` module.
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## Parameters
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- `radius` : The radius of the cylinder. It also accepts a vector `[r1, r2]`. `r1` is the bottom radius and `r2` is the top radius of a cone.
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- `levels` : The level count is performed every 360 degrees.
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- `level_dist` : The distance between two vertial points.
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- `vt_dir` : `"SPI_DOWN"` for spiraling down. `"SPI_UP"` for spiraling up. The default value is `"SPI_DOWN"`.
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- `rt_dir` : `"CT_CLK"` for counterclockwise. `"CLK"` for clockwise. The default value is `"CT_CLK"`.
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- `$fa`, `$fs`, `$fn` : Check [the cylinder module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#cylinder) for more details.
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## Examples
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use <helix.scad>
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use <polyline_join.scad>
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$fn = 12;
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points = helix(
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radius = 40,
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levels = 10,
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level_dist = 10,
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vt_dir = "SPI_UP",
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rt_dir = "CLK"
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);
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for(p = points) {
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translate(p)
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sphere(5);
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}
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polyline_join(points)
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sphere(1);
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use <helix.scad>
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use <polyline_join.scad>
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$fn = 12;
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points = helix(
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radius = [40, 20],
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levels = 10,
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level_dist = 10,
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vt_dir = "SPI_UP",
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rt_dir = "CLK"
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);
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polyline_join(points)
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sphere(1);
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%cylinder(h = 100, r1 = 40, r2 = 20);
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