PhysicsDebugDraw class is responsible for rendering geometric stuff.
https://github.com/netonjm/ChipmunkSharp/blob/v7.0.0.Leaf/examples/ChipmunkExample/Common/Extensions/CCPhysicsDebugNode%20.cs
Right now this class was specifically created for CocoSharp library and not flexible to use in other stuff. Now we need to add more abstraction and re-architecture it, to allow handle multiple libraries, drawing API's and/or platforms... etc...