Performance issues with Compound Colliders

Unity Engine
1

Hi,
Working on an airship game.

The airships are “IsKinimatic” rigid bodies.

They have empty child gameobjects with Box Colliders" set to be triggers. They are hitboxes and set on a layer to only collide with projectiles. These child gameobjects are NOT rigid bodies. I have around 30 hitboxes per ship.

Just calling Transform.postion = on the ships is dropping my framerate from: 60 without the hitboxes, to 30 with them.

Any thoughts? Can unity not handle moving 60 Box Colliders? Do I need to roll my own projectile collision system or am I missing something in Unity?

P.s. non of the game objects are scaled and I have a really powerful box.

Thanks!

2

I think you should move through Rigidbody.position or MovePosition(). See http://forum.unity3d.com/threads/159434-What-exactly-is-considered-quot-moving-static-colliders-quot. The performance in similiar cases should be better in 5.0 http://forum.unity3d.com/threads/235119-Unity-5-and-Physx-3-3-0-details?p=1603093&viewfull=1#post1603093

3

Thank you so much.

Just changing transform.position to rigidbody.MovePosition took the component from 45% of my processing power to 1.3%.

With those kind of performance implications they should really though a warning in code. 0_o

Thanks again!