dotSCAD/docs/lib-path_extrude.md

path_extrude

It extrudes a 2D shape along a path. This module is suitable for a path created by a continuous function.

It depends on the rotate_p function and the polysections module. Remember to include "rotate_p.scad" and "polysections.scad".

When using this module, you should use points to represent the 2D shape. You need to provide indexes of triangles, too. This module provides two prepared triangles indexes. One is "RADIAL". See polysections for details.

Parameters

• shape_pts : A list of points represent a shape. See the example below.
• path_pts : A list of points represent the path.
• triangles : "RADIAL" (default), "HOLLOW" or user-defined indexes. See example below.

Examples

include <rotate_p.scad>;
include <polysections.scad>;
include <path_extrude.scad>;
include <bezier_curve.scad>;

t_step = 0.05;
width = 2;

p0 = [0, 0, 0];
p1 = [40, 60, 35];
p2 = [-50, 70, 0];
p3 = [20, 150, -35];
p4 = [30, 50, -3];

shape_pts = [
    [10, 0, 0],
    [15, 10, 0],
    [18, 9, 0],
    [20, 0, 0]
];

path_pts = bezier_curve(t_step, 
    [p0, p1, p2, p3, p4]
);

path_extrude(shape_pts, path_pts);

include <rotate_p.scad>;
include <polysections.scad>;
include <path_extrude.scad>;
include <bezier_curve.scad>;

t_step = 0.05;
width = 2;

p0 = [0, 0, 0];
p1 = [40, 60, 35];
p2 = [-50, 70, 0];
p3 = [20, 150, -35];
p4 = [30, 50, -3];

shape_pts = [
    // outer
    [10, 0, 0],
    [15, 10, 0],
    [18, 9, 0],
    [20, 0, 0],
    // inner
    [12, 2, 0],
    [15, 7, 0],
    [17, 7, 0],
    [18, 2, 0]
];

path_pts = bezier_curve(t_step, 
    [p0, p1, p2, p3, p4]
);

path_extrude(shape_pts, path_pts, triangles = "HOLLOW");

include <rotate_p.scad>;
include <polysections.scad>;
include <path_extrude.scad>;
include <bezier_curve.scad>;

t_step = 0.05;
width = 2;

p0 = [0, 0, 0];
p1 = [40, 60, 35];
p2 = [-50, 70, 0];
p3 = [20, 150, -35];
p4 = [30, 50, -3];

shape_pts = [
    // outer
    [10, 0, 0],
    [15, 10, 0],
    [30, 0, 0],
    // inner
    [12, 1, 0],
    [15, 8, 0],
    [26, 1, 0],        
];

path_pts = bezier_curve(t_step, 
    [p0, p1, p2, p3, p4]
);

path_extrude(
    shape_pts, 
    path_pts, 	   
    triangles = [
        [0, 3, 4],
        [0, 4, 1],
        [1, 4, 5],
        [1, 5, 2],
        [2, 5, 3],
        [2, 3, 0]
    ]
);