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40 lines
1.4 KiB
OpenSCAD
40 lines
1.4 KiB
OpenSCAD
/**
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* cross_sections.scad
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*
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* Given a starting cross-section, points and angles along the path, this function
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* will return all cross-sections.
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*
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* @copyright Justin Lin, 2017
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* @license https://opensource.org/licenses/lgpl-3.0.html
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*
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* @see https://openhome.cc/eGossip/OpenSCAD/lib-cross_sections.html
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*
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**/
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include <__private__/__to3d.scad>;
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include <__private__/__is_vector.scad>;
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function cross_sections(shape_pts, path_pts, angles, twist = 0, scale = 1.0) =
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let(
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len_path_pts_minus_one = len(path_pts) - 1,
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sh_pts = len(shape_pts[0]) == 3 ? shape_pts : [for(p = shape_pts) __to3d(p)],
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pth_pts = len(path_pts[0]) == 3 ? path_pts : [for(p = path_pts) __to3d(p)],
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scale_step_vt = __is_vector(scale) ?
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[(scale[0] - 1) / len_path_pts_minus_one, (scale[1] - 1) / len_path_pts_minus_one] :
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[(scale - 1) / len_path_pts_minus_one, (scale - 1) / len_path_pts_minus_one],
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scale_step_x = scale_step_vt[0],
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scale_step_y = scale_step_vt[1],
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twist_step = twist / len_path_pts_minus_one
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)
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[
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for(i = [0:len_path_pts_minus_one])
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[
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for(p = sh_pts)
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let(scaled_p = [p[0] * (1 + scale_step_x * i), p[1] * (1 + scale_step_y * i), p[2]])
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rotate_p(
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rotate_p(scaled_p, twist_step * i)
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, angles[i]
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) + pth_pts[i]
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]
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];
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