polyround — polygon với các góc bo tròn

You use polyround in the same way as you would use polygon, with the exception that all points for the corners have a third "coordinate" resembling the radius used to round the corner. If this radius is 0 for a point the behavior of polyround is exactly identical as polygon. If the radius is a positive number it will draw the outline around a circle with the specified radius located at the position of the coordinates specified, forming a convex rounded corner. For concave rounded corners you specify the radius as a negative number.

Whenever using this package you need to use them inside your OpenSCAD code with the statement

use <polyround.scad>

Once you do that you can use polyround with the same syntax as you would use polygon. Find some examples at the bottom of this file.