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Question by Houman47 · Jul 26, 2016 at 07:35 AM · collisionrigidbodytrigger

The trigger enter detect fast moving object more accurate

I'm working on a bow and arrow shooting scene ! when I shoot to hit a wall , I want to arrow stick in the wall , the problem is when the speed of arrow is low it works fine ! but when its fast ! its pass through the wall and sticks inside the wall , which means that the trigger detector is slow on that ! how can I make it more accurate too detect it faster ?that arrow stop out side the wall . any idea ?

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avatar image mrpmorris · Jul 26, 2016 at 08:55 AM 0
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Try storing the arrow's previous transform x,y,z at the end of each FixedUpdate. Then when a collision is detected cast a ray from the previous position to the new position (not including the arrow) and see where on the target it collides and set your arrow position accordingly.

avatar image Cherno mrpmorris · Jul 26, 2016 at 12:08 PM 0
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^That's the way to do it. Unity's physics system can only do so much, in the end you have to use such workarounds to get reliable collision with high-speed colliders.

avatar image mrpmorris Cherno · Jul 26, 2016 at 12:12 PM 0
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I'll add it as an answer then, thanks :)

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Answer by mrpmorris · Jul 26, 2016 at 12:12 PM

Try storing the arrow's previous transform x,y,z at the end of each FixedUpdate. Then when a collision is detected cast a ray from the previous position to the new position (not including the arrow) and see where on the target it collides and set your arrow position accordingly.

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Answer by Brian-FJ · Jul 27, 2016 at 07:44 AM

You could try changing the rigidbody's collisionDetectionMode to ContinuousDynamic. (https://docs.unity3d.com/ScriptReference/Rigidbody-collisionDetectionMode.html) It can have an effect on performance but it's worth looking into.

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