# Non-physical collision problem

**URL:** <https://forum.babylonjs.com/t/non-physical-collision-problem/47684>\
**Category:** Questions\
**Created:** [January 31, 2024, 1:26am UTC](https://forum.babylonjs.com/t/non-physical-collision-problem/47684 "2024-01-31T01:26:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![lvjing1111122](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/lvjing1111122/32/36450_2.png) [@lvjing1111122](https://forum.babylonjs.com/u/lvjing1111122)\
**Post date:** [January 31, 2024, 1:26am UTC](https://forum.babylonjs.com/t/non-physical-collision-problem/47684/1 "2024-01-31T01:26:41Z")

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![image](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/3/8/38b7d37188df50d2e1818b2e9431ea4b3f5b4867.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/6/3/637ad34c0adb1b76a7b2b2efa18f4fb4bb82896b.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/6/0/60ce08f030da51883f263cb02a12a88d14d9e8db.jpeg)

I’m making a tower defense demo，I encountered a collision problem. I did not use physical collision. I used mesh.intersectsMesh, which is not very accurate for the collision of circular objects.  
The circular area is left in the picture3, but the collision continues

Do intersectsMesh and moveWithCollisions detect bound box?

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<div class="post-metadata">

**Author:** ![labris](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/labris/32/12576_2.png) [@labris](https://forum.babylonjs.com/u/labris)\
**Post date:** [January 31, 2024, 2:02am UTC](https://forum.babylonjs.com/t/non-physical-collision-problem/47684/2 "2024-01-31T02:02:47Z")

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You may try to increase the precision of the bounding box by setting the second parameter to `true`.

`mesh.intersectsMesh(mesh2, true)`

Docs - [Mesh Intersections | Babylon.js Documentation](https://doc.babylonjs.com/features/featuresDeepDive/mesh/interactions/mesh_intersect)

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<div class="post-metadata">

**Author:** ![lvjing1111122](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/lvjing1111122/32/36450_2.png) [@lvjing1111122](https://forum.babylonjs.com/u/lvjing1111122)\
**Post date:** [January 31, 2024, 5:54am UTC](https://forum.babylonjs.com/t/non-physical-collision-problem/47684/3 "2024-01-31T05:54:20Z")

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perfect solution