Help How to find out the rope tension

[josemendez]

I have another question, why does the rope go through the wall? 

Hi!

Because the mesh is not readable.
You need to enable the Read/write checkbox in the mesh import settings, as the error message instructs you to do.

Note that if you don't make the mesh readable but use it in a MeshCollider and:

-The Mesh Collider’s Transform has negative scaling (for example, (–1, 1, 1)) and the Mesh is convex.-
-The Mesh Collider’s transform is skewed or sheared (for example, when a rotated transform has a scaled parent transform).
-The Mesh Collider’s Cooking Options flags are set to any value other than the default.

It won't work. This is standard Unity behavior and holds true regardless of you using Obi or not.
https://docs.unity3d.com/Manual/class-MeshCollider.html

kind regards,