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Hi all, I am new to the amazing Babylon.js and this is my first post in the forum! Here's my problem. Let's say that I have two meshes (these meshes might be randomly generated irregular polygons but for simplicity I am using two boxes). I merge them using CGS and then I flatten them by scaling the Y to zero (I am not sure if it is the correct way. I basically need to convert the 3D mesh to a 2D irregular polygon). I use a function to show the normals of the generated mesh and it shows me all the vertices. I only need to get the list of border vertices not the ones that falls inside the mesh. Upon getting the list, I would like to calculate the length of each border edges. I created a playground to demonstrate the issue. https://playground.babylonjs.com/#HCH1F4 I appreciate your help.