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127 lines
3.0 KiB
Markdown
127 lines
3.0 KiB
Markdown
# rail_extruded_sections
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Given a rail with the first point at the outline of a shape. This function uses the rail to extrude the shape and returns all sections in the reversed order of the rail. Combined with the `sweep` module, you can create rail extrusion.
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In order to control extrusion easily, I suggest using `[x, 0, 0]` as the first point and keeping y = 0 while building the rail.
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**Since:** 3.2
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## Parameters
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- `shape_pts` : A list of points represent a shape.
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- `rail` : A list of points represent the edge path.
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## Examples
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use <hull_polyline3d.scad>;
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use <shape_taiwan.scad>;
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use <rail_extruded_sections.scad>;
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use <sweep.scad>;
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taiwan = shape_taiwan(100);
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fst_pt = [13, 0, 0];
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rail = [
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fst_pt,
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fst_pt + [0, 0, 10],
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fst_pt + [10, 0, 20],
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fst_pt + [8, 0, 30],
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fst_pt + [12, 0, 40],
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fst_pt + [0, 0, 50],
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fst_pt + [0, 0, 60]
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];
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#hull_polyline3d(rail);
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sweep(rail_extruded_sections(taiwan, rail));
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use <hull_polyline3d.scad>;
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use <shape_taiwan.scad>;
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use <rail_extruded_sections.scad>;
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use <sweep.scad>;
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use <bezier_curve.scad>;
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taiwan = shape_taiwan(100);
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fst_pt = [13, 0, 0];
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rail = bezier_curve(0.05, [
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fst_pt,
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fst_pt + [0, 0, 10],
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fst_pt + [10, 0, 20],
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fst_pt + [8, 0, 30],
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fst_pt + [12, 0, 40],
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fst_pt + [0, 0, 50],
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fst_pt + [0, 0, 60]
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]);
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#hull_polyline3d(rail);
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sweep(rail_extruded_sections(taiwan, rail));
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use <shape_taiwan.scad>;
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use <rail_extruded_sections.scad>;
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use <sweep.scad>;
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use <bezier_curve.scad>;
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use <ptf/ptf_rotate.scad>;
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taiwan = shape_taiwan(100);
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fst_pt = [13, 0, 0];
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rail = bezier_curve(0.05, [
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fst_pt,
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fst_pt + [0, 0, 10],
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fst_pt + [10, 0, 20],
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fst_pt + [8, 0, 30],
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fst_pt + [12, 0, 40],
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fst_pt + [0, 0, 50],
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fst_pt + [0, 0, 60]
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]);
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leng = len(rail);
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twist = -90;
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twist_step = twist / leng;
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sections = rail_extruded_sections(taiwan, rail);
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rotated_sections = [
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for(i = [0:leng - 1])
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[
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for(p = sections[i])
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ptf_rotate(p, twist_step * i)
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]
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];
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sweep(rotated_sections);
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use <hull_polyline3d.scad>;
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use <shape_taiwan.scad>;
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use <rail_extruded_sections.scad>;
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use <sweep.scad>;
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use <ptf/ptf_rotate.scad>;
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taiwan = shape_taiwan(100);
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/*
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You can use any point as the first point of the edge path.
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Just remember that your edge path radiates from the origin.
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*/
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fst_pt = [taiwan[0][0], taiwan[0][1], 0];//[13, 0, 0];
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a = atan2(fst_pt[1], fst_pt[0]);
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rail = [
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fst_pt,
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fst_pt + ptf_rotate([0, 0, 10], a),
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fst_pt + ptf_rotate([10, 0, 20], a),
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fst_pt + ptf_rotate([8, 0, 30], a),
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fst_pt + ptf_rotate([10, 0, 40], a),
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fst_pt + ptf_rotate([0, 0, 50], a),
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fst_pt + ptf_rotate([0, 0, 60], a)
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];
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#hull_polyline3d(rail);
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sweep(rail_extruded_sections(taiwan, rail));
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