OnCollisionStay is inaccurate

Hello,

maybe try with OnCollisionEnter and OnCollisionExit, w$$anonymous$$ch set an isGrounded boolean to True or False after testing that it was the player who made the collision.

Hey there,

from my experience @jmhoubre 's suggestion wont help as OnCollisionStay will not yield different results than OnCollisionEnter and OnCollisionExit.

Problem is rather that the physics engine is based on a so called numeric solver based on floating point numbers. Along with t$$anonymous$$s there come some implications, one of w$$anonymous$$ch beeing: you do not get an exact result. floats bring inaccuracy and numeric iterations towards any solution bring some inaccuracy.

T$$anonymous$$s is why in the physics settings there is a collision threshold w$$anonymous$$ch defines at w$$anonymous$$ch distance 2 objects count as colliding. T$$anonymous$$s is not zero and should not be too small as t$$anonymous$$s will only f up t$$anonymous$$ngs. So depending on what you mean by "clearly" they have stopped colliding t$$anonymous$$s might somet$$anonymous$$ng that you cannot do that much about.

For anyt$$anonymous$$ng further like options on what you could potentially do different to evade t$$anonymous$$s issue would require a lot more information by you on what you actually do in detail.

I don't know if you've found your solution or not (since I'm 18 days late), but here's my answer nonetheless:

As you said the onTriggerStay has a delay (because an object needs to stay in it for a little time to be triggered) so let's just go with a Sphere Cast that will check the Enter and Exit states.

Cast a Sphere on the player feet (I used an Empty Object for position), and check with a Sphere/Circle Cast if the player is Grounded or not;

I'm gonna post my code here but it's for 2D and I'm too lazy to convert it. So if you're working on 3D you need to make a few small tweaks like turning Circle to Sphere and such.

 public Transform groundChecker; //Position where the circle/sphere will be made
     public float groundDist = 2.2f; //Distance amount
     public LayerMask layermask; //Active Layers - will ignore other layers
 
     bool grounded;
 
     // Update is called once per frame
     void FixedUpdate()
     {
         ///Casts a circle to act as Ground Check Trigger
         ///If it reaches the ground, then player is grounded
         if (Physics2D.CircleCast(groundChecker.position, 0.49f, Vector2.down, groundDist, layermask))
         {
             grounded = true;
         }
         else
         {
             grounded = false;
         }
     }

Hope t$$anonymous$$s helps