ScriptReference/Physics.OverlapSphereNonAlloc

[giscus[bot]]

ScriptReference/Physics.OverlapSphereNonAlloc

https://docs.unity3d.com/ScriptReference/Physics.OverlapSphereNonAlloc.html

[metz-spg]

This page leaves out some important aspects such as that when you have 10 colliders in range and next frame only 9, the one that left will still be in the array.
I tested the performance gains from this method compared to classic Physics.OverlapSphere and the performancegains aren't as huge as you might think so unless you need thousands of OverlapSpheres per frame you may want to stick to the easier Physics.OverlapSphere.
You can look up the details in my blogpost here.

(Updated based on vertxxyz's corrections)

[vertxxyz]

You are misusing this method by discarding the return value.

Returns
int Returns the amount of colliders stored into the results buffer.

You don't need to discard anything from the buffer, you just need to iterate over the count of elements provided to you.

I would also note that FPS is a bad measure of performance, especially when the comparison regards garbage allocation and collection.

[metz-spg]

Definitely a valid point and took new measurements and updated my Blogpost. However you still get very limited performancegains from OverlapSphereNonAlloc.