golden_spiral_extrude

Extrudes a 2D shape along the path of a golden spiral.

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 for details.

Parameters

• shape_pts : A list of points represent a shape. See the example below.
• from : The nth Fibonacci number you wanna start from.
• to : The nth Fibonacci number you wanna go to.
• point_distance : Distance between two points on the path.
• rt_dir : "CT_CLK" for counterclockwise. "CLK" for clockwise. The default value is "CT_CLK".
• twist : The number of degrees of through which the shape is extruded.
• scale : Scales the 2D shape by this value over the length of the extrusion. Scale can be a scalar or a vector.
• triangles : "SOLID" (default), "HOLLOW" or user-defined indexes. See sweep for details.

Examples

use <golden_spiral_extrude.scad>;

shape_pts = [
    [2, -10],
    [2, 10],
    [-2, 10],
    [-2, -10]
];

golden_spiral_extrude(
    shape_pts, 
    from = 3, 
    to = 10, 
    point_distance = 1,
    rt_dir = "CLK",
    twist = 180,
    scale = 0.1
);

use <shape_circle.scad>;
use <golden_spiral_extrude.scad>;

$fn = 12;

shape_pts = concat(
    shape_circle(radius = 3),
    shape_circle(radius = 2)
);

golden_spiral_extrude(
    shape_pts, 
    from = 5, 
    to = 10, 
    point_distance = 1,
    scale = 10,
    triangles = "HOLLOW"
);