# A question about instances

**URL:** <https://forum.kirupa.com/t/a-question-about-instances/316374>\
**Category:** Uncategorized\
**Created:** [November 19, 2010, 5:55pm UTC](https://forum.kirupa.com/t/a-question-about-instances/316374 "2010-11-19T17:55:32Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![rimacy](https://avatars.discourse-cdn.com/v4/letter/r/839c29/32.png) [@rimacy](https://forum.kirupa.com/u/rimacy)\
**Post date:** [November 19, 2010, 5:55pm UTC](https://forum.kirupa.com/t/a-question-about-instances/316374/1 "2010-11-19T17:55:32Z")

</div>

say i have a field of bumpers. there are four kinds of bumpers:bounceUp,bounceLeft,bounceRight,bounceDown.  
There are multiple instances of each.  
In the collision detection the ball is checked for collision against all of them

here is the question:  
do i have to check each instance of each bumper or can I just check for ball colliding with bounceLeft and this would check ALL instances of bounceLeft?