Thanks Omega for your answer.
still, lets say we got the relative hit location (x:5,y:-2), this can tell that the impact was in Front and Left, But wont give me the exact impact side (Front OR Left, not both).
I thought about using more collision boxes to indicate sides, but i have many tanks, which mean i will have to make sure of having 4 boxes per tank, aligned correctly based on the tank shape…very annoying work lol.