Gets the radius of the shape.
radius = Shape:getRadius()
From the Box2D manual:
Polygons inherit a radius from Shape. The radius creates a skin around the polygon. The skin is used in stacking scenarios to keep polygons slightly separated. This allows continuous collision to work against the core polygon.
None.
number radius
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Licensed under the GNU Free Documentation License, Version 1.3.
https://love2d.org/wiki/Shape:getRadius