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131 lines
2.9 KiB
Markdown
131 lines
2.9 KiB
Markdown
# path_extrude
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It extrudes a 2D shape along a path. This module is suitable for a path created by a continuous function.
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It depends on the rotate_p function and the polysections module. Remember to include "rotate_p.scad" and "polysections.scad".
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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](https://openhome.cc/eGossip/OpenSCAD/lib-polysections.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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- `path_pts` : A list of points represent the path.
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- `triangles` : `"RADIAL"` (default), `"HOLLOW"` or user-defined indexes. See example below.
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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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- `closed` : If the first point and the last point of `path_pts` has the same coordinate, setting `closed` to `true` will connect them automatically.
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## Examples
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include <rotate_p.scad>;
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include <polysections.scad>;
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include <path_extrude.scad>;
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include <bezier_curve.scad>;
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t_step = 0.05;
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width = 2;
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p0 = [0, 0, 0];
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p1 = [40, 60, 35];
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p2 = [-50, 70, 0];
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p3 = [20, 150, -35];
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p4 = [30, 50, -3];
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shape_pts = [
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[10, 0, 0],
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[15, 10, 0],
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[18, 9, 0],
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[20, 0, 0]
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];
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path_pts = bezier_curve(t_step,
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[p0, p1, p2, p3, p4]
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);
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path_extrude(shape_pts, path_pts);
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include <rotate_p.scad>;
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include <polysections.scad>;
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include <path_extrude.scad>;
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include <bezier_curve.scad>;
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t_step = 0.05;
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width = 2;
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p0 = [0, 0, 0];
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p1 = [40, 60, 35];
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p2 = [-50, 70, 0];
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p3 = [20, 150, -35];
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p4 = [30, 50, -3];
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shape_pts = [
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// outer
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[10, 0, 0],
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[15, 10, 0],
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[18, 9, 0],
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[20, 0, 0],
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// inner
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[12, 2, 0],
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[15, 7, 0],
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[17, 7, 0],
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[18, 2, 0]
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];
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path_pts = bezier_curve(t_step,
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[p0, p1, p2, p3, p4]
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);
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path_extrude(shape_pts, path_pts, triangles = "HOLLOW");
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include <rotate_p.scad>;
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include <polysections.scad>;
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include <path_extrude.scad>;
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include <bezier_curve.scad>;
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t_step = 0.05;
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width = 2;
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p0 = [0, 0, 0];
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p1 = [40, 60, 35];
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p2 = [-50, 70, 0];
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p3 = [20, 150, -35];
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p4 = [30, 50, -3];
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shape_pts = [
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// outer
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[10, 0, 0],
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[15, 10, 0],
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[30, 0, 0],
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// inner
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[12, 1, 0],
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[15, 8, 0],
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[26, 1, 0],
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];
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path_pts = bezier_curve(t_step,
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[p0, p1, p2, p3, p4]
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);
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path_extrude(
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shape_pts,
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path_pts,
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triangles = [
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[0, 3, 4],
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[0, 4, 1],
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[1, 4, 5],
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[1, 5, 2],
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[2, 5, 3],
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[2, 3, 0]
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]
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);
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