A way to check for gameobjects within a radius like Physics.OverlapSphere when there's no collider?

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I'm trying to find a way to check if certain gameobjects (with tag) are within a radius but they don't have a collider so using overlapsphere isn't the way. Also I know that I could check the distances between all the gameobjects and determine if they are within the radius, but in this case there will be such a huge number of those gameobjects that I'm worried it will lag my game. Any ideas?

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Answer by Llama_w_2Ls · Aug 18, 2020 at 07:27 PM

You could just add a collider and set it to IsTrigger. This way, having a box collider or not wouldnt affect the gameobject in any way from a physics perspective, but will allow you to use the OnTriggerEnter(Collision collider) function. Or you could do a raycast as well. You dont need a collider, as you can check the hit.transform instead of hit.collider. Also Physics.Checksphere can check for gameobjects with a certain layer or layermask. For example:

     public Transform GroundCheck; //Empty gameobject that is the center of the sphere
     public float GroundDistance = 0.4f; //radius
     public LayerMask groundmask; //layer to check for
 
     void Update()
     {
           bool IsGrounded = Physics.CheckSphere(GroundCheck.position, GroundDistance, groundmask);
     }

@Quadovc

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Quadovc · Aug 19, 2020 at 10:46 AM 0

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Thanks! Didn't think about using them as triggers. (If you want you can post your comment as answer so I can check it as correct)

A way to check for gameobjects within a radius like Physics.OverlapSphere when there's no collider?

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