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86 lines
2.7 KiB
Markdown
86 lines
2.7 KiB
Markdown
# t3d
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An implementation of 3D Turtle Graphics with Fluent API. When using the function, imagine that you are sitting on a turtle. You move or turn the turtle from the your viewpoint, not the viewpoint of OpenSCAD coordinates.
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For more details, please see [3D turtle graphics](https://openhome.cc/eGossip/OpenSCAD/3DTurtleGraphics.html).
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**Since:** 2.1
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## Parameters
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- `t` : The data of a turtle. `t3d()` with no arguments will return a turtle with the point `[0, 0, 0]` and the unit vectors `[[1, 0, 0], [0, 1, 0], [0, 0, 1]]`.
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- `cmd` : It accepts a string or a list of commands.
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- Given a string: `"xturn"`, `"yturn"`, `"zturn"`, `"xforward"`, `"yforward"`, `"zforward"`, `"point"` or `"unit_vectors"`. If `"xturn"`, `"yturn"` or `"zturn"` is provided, the `angle` parameter is required. If `"xforward"`, `"yforward"` or `"zforward"` is provided, `leng` is required. `"point"` and `"unit_vectors"` are used to get respective data from a turtle.
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- Given a list: `[[cmd1, value], [cmd2, value2], ...]`. For example, `[["xforward", 10], ["zturn", 120]]` will forward a turtle 10mm along the x axis and turn it 120 degrees around the z axis from your viewpoint.
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- `point` : Set the position of a turtle.
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- `unit_vectors` : Set the unit vectors of a turtle.
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- `angle` : Set the angle of a turtle if `cmd` is not provided. Turn a turtle if `cmd` is `"xturn"`, `"yturn"` or `"zturn"`.
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- `leng` : Forward a turtle if `cmd` is `"xforward"`, `"yforward"` or `"zforward"`.
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## Examples
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use <turtle/t3d.scad>;
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use <polyline_join.scad>;
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leng = 10;
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angle = 120;
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thickness = 1;
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t = t3d(point = [0, 0, 0]);
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t2 = t3d(t, "xforward", leng = leng);
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t3 = t3d(t2, [
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["zturn", angle],
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["xforward", leng]
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]);
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t4 = t3d(t3, [
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["zturn", angle],
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["xforward", leng]
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]);
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polyline_join(
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[for(turtle = [t, t2, t3, t4]) t3d(turtle, "point")]
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) sphere(thickness / 2);
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use <line3d.scad>;
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use <turtle/t3d.scad>;
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module tree(t, leng, leng_scale1, leng_scale2, leng_limit,
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angleZ, angleX, width) {
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if(leng > leng_limit) {
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t2 = t3d(t, "xforward", leng = leng);
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line3d(
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t3d(t, "point"), t3d(t2, "point"),
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width);
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tree(
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t3d(t2, "zturn", angle = angleZ),
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leng * leng_scale1, leng_scale1, leng_scale2, leng_limit,
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angleZ, angleX,
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width);
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tree(
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t3d(t2, "xturn", angle = angleX),
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leng * leng_scale2, leng_scale1, leng_scale2, leng_limit,
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angleZ, angleX,
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width);
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}
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}
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leng = 100;
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leng_limit = 1;
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leng_scale1 = 0.4;
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leng_scale2 = 0.9;
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angleZ = 60;
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angleX = 135;
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width = 2;
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t = t3d(point = [0, 0, 0]);
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tree(t, leng, leng_scale1, leng_scale2, leng_limit,
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angleZ, angleX, width);
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