My Unity2d jump is sporadic and fluctuates randomely.

Questions & Answers
1

I’m making a 2d fighting game. Most of the time, the jump works. But ever 8 jumps or so, it will go a different height, rather super high or just higher than usual. Even if I’m not moving horizontally, it’ll seem to be working fine and the jump will work multiple times in a row, but then it’ll jump to the moon. I cannot figure out why. It doesn’t have anything to do with the coyotetime or jump buffering because that was made after. Help?

if(Input.GetButton(“Jump”))
{
jumpBufferCounter = jumpBufferTime;
}
else
{
jumpBufferCounter -= Time.deltaTime;
}

    if(isGrounded)
    {
        fallSpeed = fallCounter; 
        hangTimeCounter = hangTime;
        // anim.SetBool("isJumping, false);
        // anim.SetBool("isFalling, false);
    }
    else
    {
        FastFall();
        hangTimeCounter -= Time.deltaTime;
    }
    
    if(rb.velocity.y > 0 && !isGrounded)
    {
        isJumping = true;
    }
    else{
        isJumping = false;
    }

    if(rb.velocity.y < 0 && !isGrounded)
    {
        isFalling = true;
    }
    else{
        isFalling = false;
    }

    #endregion

    // determine if grounded]
    isGrounded = Physics2D.Raycast(transform.position, Vector2.down, groundLength, groundLayer);
    
    
    if((jumpBufferCounter > 0f) && (hangTimeCounter > 0f))
    {
        Jump();
        hangTimeCounter = 0;
    }

}
// draws line to 0.6 below (distance of raycast)
private void OnDrawGizmos()
{
    Gizmos.color = Color.red;
    Gizmos.DrawLine(transform.position, transform.position + Vector3.down * groundLength);
}

void Jump()
{
    rb.velocity = new Vector2(rb.velocity.x, 0);
    rb.AddForce(Vector2.up * jumpSpeed * Time.deltaTime, ForceMode2D.Impulse); // instand force
    jumpBufferCounter = 0f;
}
2

Don’t multiply by Delta time for a jump force. This will mean that the jump will be stronger or weaker depending how long it took to process the last frame. If your code is inside fixed update, never use Delta time, as fixed update always takes the same time. If your code is inside update, only use Delta time for continuous forces (like acceleration) not instant impulse forces (like explosions, impacts or jumps)