dotSCAD/docs/lib3x-trim_shape.md

trim_shape

Given a tangled-edge shape. This function trims the shape to a non-tangled shape. It's intended to be a helper function after using bijection_offset.

Since: 1.3.

Parameters

• shape_pts : The shape points.
• from : The index of the start point you want to trim.
• to : The index of the last point you want to trim.
• epsilon : An upper bound on the relative error due to rounding in floating point arithmetic. Default to 0.0001.

Examples

use <hull_polyline2d.scad>;
use <trim_shape.scad>;
use <shape_taiwan.scad>;
use <bijection_offset.scad>;
use <midpt_smooth.scad>;

taiwan = shape_taiwan(50);
offseted = bijection_offset(taiwan, -2);
trimmed = trim_shape(offseted, 3, len(offseted) - 6);
smoothed = midpt_smooth(trimmed, 3);

#hull_polyline2d(taiwan, .1); 
%translate([25, 0, 0]) 
    hull_polyline2d(offseted, .2);
hull_polyline2d(smoothed, .1);