Physics.OverlapCapsuleNonAlloc vs Physics.SphereCastNonAlloc

Unity Engine
1

Can anyone tell me which one is more is more efficient(If either is more than the other)

2

For these types of questions there is very often not a clear answer but it’s also very easy to test this yourself by creating a basic stress test of each and looking at the profiler results. Even better, you can test it in a more realistic environment in your project which gives you results for your specific use-case.

I would only add that this kind of question is only important if you intend on performing a lot of these queries per-frame because individually they are relatively inexpensive.

3

For me, SphereCastNonAlloc was 1.5x faster than the capsule one.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using TheCOLDDev.Utilities;

public class TT_OverlapStressTest : MonoBehaviour
{
    public Collider[] m_Col;
    public float radius;
    public float height;
    public bool Capsule = false;
    // Start is called before the first frame update
    void Start()
    {
       
    }

    // Update is called once per frame
    void Update()
    {
        m_Col = new Collider[32];
        if(!Capsule)Physics.OverlapSphereNonAlloc(transform.position , radius , m_Col , TC_Utilities.EverythingLayer() , QueryTriggerInteraction.Collide);
        else Physics.OverlapCapsuleNonAlloc(transform.position + transform.up * height/2 , transform.position - transform.up  * 0.5f *height, radius , m_Col ,TC_Utilities.EverythingLayer() , QueryTriggerInteraction.Collide);
    }
}

with around 250 Calls per second(different instances) for 100 colliders

4

I would expect Sphere/Circle to be the fastest because it’s a simpler collision test overall, certainly sphere/sphere and circle/circle but certainly the profiler is the real measure as the pure collision detection is only part of it.

You might be better off performing them both in a loop many times per-tick to get more accurate results but your results sound valid.

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