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Question by Rugbug_Redfern · Mar 21, 2018 at 10:52 PM · unity 5rigidbodytransformunity5collision detection

Collider with rigidbody does not register collision with terrain

I have a gameobject that uses transform.Translate() to move. It has a collider and a rigidbody, but it never detects collision with the terrain. I can see it pass through the terrain, but with this code

     void OnCollisionEnter(Collision col) {
         FindRunAwayLocation(col.contacts[0].point);
         Debug.Log("oof");
     }

It does not register the collision. Any answers? Thanks

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avatar image losingisfun · Mar 22, 2018 at 04:37 AM 0
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make sure if it's 2D you use OnCollisionEnter2D

avatar image Rugbug_Redfern losingisfun · Mar 22, 2018 at 02:14 PM 0
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I'm using a 3D object.

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Answer by donutLaserDev · Mar 22, 2018 at 02:21 PM

Well, first thing is, is the rigidbody dynamic? If so, you shouldn't use transform.Translate to move it. Change rigidbody's velocity or use forces (e.g., rigidbody.AddForce) to move it. It is possible that from the perspective of physics engine, the game object did not move anywhere due to you moving it via transform. If the rigidbody is kinematic, it will not collide with static colliders as shown in the collision matrix on this page: https://docs.unity3d.com/Manual/CollidersOverview.html

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avatar image Rugbug_Redfern · Mar 24, 2018 at 01:10 AM 0
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I ended up making my rigidbody not kinematic and putting

rb.position = transform.position;

in my update method. Thanks!

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Answer by BigPha · Mar 22, 2018 at 05:03 PM

Check if you don't mix collider2d and colllider, if you terrain has collider2d on it and you rigidbody has collider, the collision will not be registered.

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avatar image Rugbug_Redfern · Mar 24, 2018 at 12:48 AM 0
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it does not have a 2d collider.

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