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Question by HolBol · Aug 27, 2010 at 12:25 AM · collisionrigidbodyspeedcar

collision not working at high speeds

i have 2 cars in my scene, yet, when both are moving, sometimes the collision is ignored, and i can drive straight through the other car! How do i fix this?

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avatar image spinaljack · Aug 27, 2010 at 01:04 AM 1
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Get unity 3. It has an option for continuous collision detection that prevents fast objects from passing through things

avatar image HolBol · Aug 27, 2010 at 10:05 AM 0
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this sounds best. Thanks, i'll wait till that comes out :).

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Answer by 3dDude · Aug 27, 2010 at 12:47 AM

check out this script on the wiki

and meshColliders don't work as well on heigh speeds collisions as a boxCollider would.

so try using box colliders if you are using meshCollider

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avatar image HolBol · Aug 27, 2010 at 10:05 AM 0
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Already using box colliders

avatar image Wolfram · Aug 27, 2010 at 11:31 AM 0
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@Fishmasn92: The script 3dDude linked to is quite simple, useful and reliable in catching problems like yours. It's definitely worth trying while waiting for unity3 ;-)

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Answer by tylo · Aug 27, 2010 at 10:02 PM

You may want to look into using Raycasts as another form of collision detection. May not be the solution, but I'm just trying to give you some options.

http://unity3dstudent.com/2010/08/intermediate-i01-raycasting/

I believe what is happening is that you're moving so fast, that you are skipping right through the object before it has a chance of doing any detection. This is a common problem in game design, so see if you can't find someone who talks about it online through google.

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Answer by tylo · Aug 27, 2010 at 04:12 AM

Be sure to do your physics in the FixedUpdate method as well, if you are not already.

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avatar image HolBol · Aug 27, 2010 at 10:05 AM 0
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