Given a path, the `bezier_smooth`

function uses bazier curves to smooth all corners. You can use it to create smooth lines or rounded shapes.

## Parameters

`path_pts`

: A list of points represent the path.`round_d`

: Used to create the other two control points at the corner.`t_step`

: The distance between two points of the Bézier path at the corner. It defaults to 0.1.`closed`

: It defaults to`false`

. If you have a closed path, set it to`true`

.`angle_threshold`

: Default to 0. If the angle between two line segments is bigger than`angle_threshold`

, smooth those two segments.**Since:**3.0

## Examples

```
use <hull_polyline3d.scad>;
use <bezier_smooth.scad>;
width = 2;
round_d = 15;
path_pts = [
[0, 0, 0],
[40, 60, 10],
[-50, 90, 30],
[-10, -10, 50]
];
hull_polyline3d(
path_pts, width
);
smoothed_path_pts = bezier_smooth(path_pts, round_d);
color("red") translate([30, 0, 0]) hull_polyline3d(
smoothed_path_pts, width
);
```

```
use <bezier_smooth.scad>;
round_d = 10;
path_pts = [
[0, 0],
[40, 0],
[0, 60]
];
polygon(path_pts);
smoothed_path_pts = bezier_smooth(path_pts, round_d, closed = true);
translate([50, 0, 0]) polygon(smoothed_path_pts);
```