Reply to Re: A question
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No, I believe the only viable ways to do this are to either make the sword create a small "missile" like an explosion and check for the tree in that explosion script (same way as the fireball works) or attach a script to all the trees that checks for being hit by that specific sword. If you choose for the second option, then you can easily use the Sprite Replacer tool to attach the same script to every instance of the tree. I would personally go for the first method if you want cool looks and maybe some extra gameplay to go with it or the second method if it needs to be quick and easy 
