dotSCAD/docs/lib3x-helix.md

helix

Gets all points on the path of a spiral around a cylinder. Its $fa, $fs and $fn parameters are consistent with the cylinder module.

Parameters

• 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.
• levels : The level count is performed every 360 degrees.
• level_dist : The distance between two vertial points.
• vt_dir : "SPI_DOWN" for spiraling down. "SPI_UP" for spiraling up. The default value is "SPI_DOWN".
• rt_dir : "CT_CLK" for counterclockwise. "CLK" for clockwise. The default value is "CT_CLK".
• $fa, $fs, $fn : Check the cylinder module for more details.

Examples

use <helix.scad>
use <polyline_join.scad>

$fn = 12;

points = helix(
    radius = 40, 
    levels = 10, 
    level_dist = 10, 
    vt_dir = "SPI_UP", 
    rt_dir = "CLK"
);

for(p = points) {
    translate(p) 
	    sphere(5);
}

polyline_join(points)
    sphere(1);

use <helix.scad>
use <polyline_join.scad>

$fn = 12;

points = helix(
	radius = [40, 20], 
	levels = 10, 
	level_dist = 10, 
	vt_dir = "SPI_UP", 
	rt_dir = "CLK"
);

polyline_join(points)
    sphere(1);

%cylinder(h = 100, r1 = 40, r2 = 20);