Question by ziv03 · Dec 29, 2013 at 02:36 PM · fps performance colliders cpu

CPU usage, fps and colliders

Hello, I have a small question. I have a long map, it has like 50 box colliders (2d if it matters) and it will have more at the end, maybe 100-200. I need for some purpose, doesn't metter what, to duplicate all colliders. so I will have 100 box colliders. now, there isn't any overlap between layers. What I mean is this:

the first 50 colliders are in layer 1, the duplicated colliders are in layer 2. now I have all kind of objects in layer 3 and layer 4. The following layers are ignoring physics: 1-2,1-4,2-3,3-4

Since I don't know how the physics engine in unity works, I wonder if doing that will make the CPU usage higher and will drop the FPS than just having 50 colliders and no ignorePhysics.

Hope I explained myself good enough :S

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PlasmaByte · Dec 29, 2013 at 02:41 PM 0

Probably fine for a computer, not sure about mobile development though :/ Can't you optimize it? Possibly build the level so its a single mesh and then just use 1 mesh collider.

ziv03 · Dec 29, 2013 at 03:00 PM 0

umm, it's a must for me to have all these colliders. btw it's physics2d, so no meshcollider. anyway, you say it's fine on computers? cause I'm thinking since I use the ignorePhysicsLayer to achieve the same result, why should it effect the cpu usage?

ziv03 · Dec 30, 2013 at 12:09 AM 0

more comments? I want to be sure before I go down that road.

TowerOfBricks · Dec 30, 2013 at 01:27 AM 0

Profile it! That's the only way to be sure. If the colliders are just static, I don't think they should add much to the CPU overhead unless you have a lot of active rigidbodies moving around. The internal tree structures should do a good job of ignoring colliders at a distance.

CPU usage, fps and colliders

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