I FOUND A SOLUTION This first part was done on Blender
1 : i import my FBX on Blender
2 : on “Edit Mode” : point your start Bone (for me to the top of my mesh) by pressing : Shift + right clickmouse
3 : on “Object Mode” Press : Shift + A for adding Armature
4 : select your Armature and drag it to the the end of your mesh (for me in this exemple) by pressing : G and Z (Z representing the axes you want to move).
for more adjustment of your bone, select vertex (in picture) press again G and Z and keep the CTRL button pressed (you’ll see the difference).
5 : on “Edit Mode” Press : right click and subdivide and select the number of cuts you need (for me i needed 20 cuts).
6 : on “Object Mode” Select your mesh first (it’s important) and your Armature and press : CTRL + P and select “With Automatic Weights”
7 : Export in FBX [COLOR=#000000]This second part was done on UE4[/COLOR]
1 : import your FBX (its necessary to select skeletal Mesh in import settings)
2 : open your physics asset and, in the Skeleton Tree select all by pressing : CTRL + A and delete all (in this example its my final result, so don’t look at this, just do the same things i say).
3 : on the tools panel set the “Min Bone Size” to 10 and Generate Bodies
4 : i finished to teach you, after this, you can press the simulate button to see the result and adjust on your mesh (rope, chain, bridge, etc…)