(C#) Boxcast/Overlapbox are framerate-dependent

Unity Engine
,
1

So, I decided to create a ground-check with a boxcast or the overlapbox. I tried both, turned out that both are framerate-dependent, meaning if I set the Application.targetFramerate to like 15, the player would clip through the floor, which is 1 unit tall (And this may sound weird but I don’t use the character controller, nor the rigidbody in this particular case)

I tried:

  1. Changing FixedUpdate() to LateUpdate(), Update()
  2. Lowering the TimeStep, probably not the best idea

Code (OverlapBox):

private void FixedUpdate()
{
Collider[ ] GroundOverlaps = Physics.OverlapBox(GroundCheck.position, new Vector3(0.5f, 0.5f, 0.5f), Quaternion.identity, GroundLayers);
if(GroundOverlaps.Length > 0)
{
Grounded = true;
}
else if(GroundOverlaps.Length == 0 && Grounded)
{
Grounded = false;
}
}

Code (BoxCast):

private void FixedUpdate()
{
if(Physics.BoxCast(GroundCheck.position, new Vector3(0.5f, 0.5f, 0.5f), Vector3.down, Quaternion.identity, 1, GroundLayers))
{
Grounded = true;
}
else
{
Grounded = false;
}
}

Is there any way to make those framerate independent? Please help, I would really appreciate it

2

You’re calling BoxCast with a constant cast distance each check. If GroundCheck.position increases by more than 1 between calls to BoxCast you’re probably going to tunnel through whatever geometry you’re checking for. If you want your cast to be frame rate independent you need a cast distances that is at least the difference between the current position and last position.