# onTrigger not working on Planes ?
**URL:** https://discussions.unity.com/t/ontrigger-not-working-on-planes/414617
**Category:** Physics
**Created:** [May 26, 2010, 5:40pm UTC](https://discussions.unity.com/t/ontrigger-not-working-on-planes/414617 "2010-05-26T17:40:45Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@JonnyHilly](https://discussions.unity.com/u/JonnyHilly)
#### Post date: [May 26, 2010, 5:40pm UTC](https://discussions.unity.com/t/ontrigger-not-working-on-planes/414617/1 "2010-05-26T17:40:45Z")
is there a problem with OnTrigger ? when used on a unity plane ?
I have a moving object which has the onTrigger code, a rigid body, and a box collider…
If I make a simple unity cube… and set IsTrigger, then move into it, then the trigger is detected and it works fine.
If I make a simple unity plane, and set IsTrigger, then move into it, the trigger doesnt go off…
is it because its a different type of collider ? Box on the cube, and mesh on the plane ?
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### Author:  [@JonnyHilly](https://discussions.unity.com/u/JonnyHilly)
#### Post date: [May 26, 2010, 5:42pm UTC](https://discussions.unity.com/t/ontrigger-not-working-on-planes/414617/2 "2010-05-26T17:42:03Z")
ok found a solution… just removed the mesh collider form the plane, and add a box collider and it works.
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### Author:  [@anon\_62136732](https://discussions.unity.com/u/anon_62136732)
#### Post date: [May 27, 2010, 3:26pm UTC](https://discussions.unity.com/t/ontrigger-not-working-on-planes/414617/3 "2010-05-27T15:26:48Z")
Using mesh colliders on a plane is tricky because it has no volume. That makes it relatively easy for objects to pass _through_ the mesh collider from one frame to another. Primitive colliders/triggers are much better to use for this!