Is there a way I can tell the position of a collision?

Question

I have two objects. One is a moving wall and the other is an object that represents a person. On the wall I added a Rigidbody and checked "Is Kinetatic" is checked, I also have a Mesh Collider and I checked "Is Trigger".

I added a script to the wall and inside the OnTriggerEnter() I have a Debug.Log("Entered") which detects a collision. On the OnTriggerStay() { renderer.material.color = Color.red; } changes the wall color once the trigger has been fired. This all works and a collision causes the wall to change color.

Is there a way that I can detect the actual point on the wall where the collision happened. What I would like to do is to have some effect at that point.

Answer 1

Best Answer

Answer by tobiasparrow · Aug 04, 2012 at 03:30 PM

Basically, OnCollisionStay gives information about the impact ( impact velocity, etc ) as where OnTriggerStay simply says, yes, we have had a collision

This will help explain them better then I can! =]

OnCollisionStay:

http://docs.unity3d.com/Documentation/ScriptReference/Collider.OnCollisionStay.html

OnTriggerStay:

http://docs.unity3d.com/Documentation/ScriptReference/Collider.OnTriggerStay.html

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Answer 2

Answer by Bluk · Aug 04, 2012 at 05:49 PM

I'm not sure why you want to use a trigger instead of a collider. The Collider class is specifically designed to get this kind of informations.

See: http://docs.unity3d.com/Documentation/ScriptReference/Collider.OnCollisionEnter.html http://docs.unity3d.com/Documentation/ScriptReference/ContactPoint.html

Hope it helps.

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Answer 3

Answer by Sundar · Aug 04, 2012 at 03:07 PM

This will help you to get contact point of a collision

http://docs.unity3d.com/Documentation/ScriptReference/Collision-contacts.html

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rscholey · Aug 04, 2012 at 03:17 PM 0

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Thanks. I notice this mentions OnCollisionStay. I will look into it myself but just wondering do you know the difference between the OnTriggerStay and OnCollisionStay?

fafase · Aug 04, 2012 at 03:34 PM 0

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Trigger disable the physics engine. It means the collision is not resolved but only detected.

Is there a way I can tell the position of a collision?

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