# What is the usesPreciseCollisionDetection for SCNPhysicsBody

**URL:** <https://forums.kodeco.com/t/what-is-the-usesprecisecollisiondetection-for-scnphysicsbody/23805>\
**Category:** 3D iOS Games by Tutorials\
**Created:** [December 6, 2016, 6:40pm UTC](https://forums.kodeco.com/t/what-is-the-usesprecisecollisiondetection-for-scnphysicsbody/23805 "2016-12-06T18:40:57Z")\
**Posts on this page:** 1\
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**Author:** ![juanmunoz](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/juanmunoz/32/64102_2.png) [@juanmunoz](https://forums.kodeco.com/u/juanmunoz)\
**Post date:** [December 6, 2016, 6:40pm UTC](https://forums.kodeco.com/t/what-is-the-usesprecisecollisiondetection-for-scnphysicsbody/23805/1 "2016-12-06T18:40:57Z")

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Hi guys.

I finished Chapter 10 and, after doing several test, I notice that occasionally the collision between the Ball and the Barriers is not detected. When this happened, the ball get out of the screen and disappear in oblivion.

For this problem there is a property in SKSpriteKit called usesPreciseCollisionDetection which you mentioned in your book “2D Apple Games by Tutorials”. Now, what is the corresponding  
property in SCNPhysicBody?

Thanks.