Rigidbody Character : Jumping After Grounded Delay

[Caiuse]

Hi,

I’m developing a simple rigidbody character controller but I’ve found that with my current jump mechanic when the character becomes grounded I can’t always jump within the first 0.2seconds of becoming grounded… I can’t work out whether this is caused by the grounding check function being slow to return true, or something else.

Can anyone suggest a better way of handling grounding and jumping so that it responds the second the player sees the character hit the ground and responds that fast too.

My current mechanic :

     function FixedUpdate (){
    	if (grounded){
            // Jump
            if (canJump && Input.GetKeyDown("x")){
                rigidbody.velocity = Vector3(velocity.x, CalculateJumpVerticalSpeed(), velocity.z);
            }
        }
        
        grounded = false;
    }
    
    function OnCollisionStay (hit : Collision){
    	if(hit.contacts.Length > 0) {
    		var contactPoints = hit.contacts;
    		if((Vector3.Dot(contactPoints[0].normal, Vector3.up)) > 0.5){ //Check for floor and upwards
    			grounded = true;
    		}
    	}
    }

function CalculateJumpVerticalSpeed (){
    // From the jump height and gravity we deduce the upwards speed 
    // for the character to reach at the apex.
    return Mathf.Sqrt(2 * jumpHeight * gravity);
}

Note: I’ve omitted the parts of the script that deal with gravity and movement to make it clear what the focus of my question it.

Cheers - Caius

[schoen08]

Thanks for this solution on how to check if a rigidbody is grounded, helped me a lot!!!