Double jump system help

Unity Engine
1

How would I go about implementing a double jump system in this

 private void FixedUpdate()
    {

        rigidBoddyComponent.velocity = new Vector3(horizontalInput * 2, rigidBoddyComponent.velocity.y, 0);
       
        //the first statement should work no matter what because it's already been previously tested alone
        if (Physics.OverlapSphere(groundCheckTransform.position, 1f, playerMask).Length == 0
        || (Physics.OverlapSphere(groundCheckTransformFront.position, 1f, playerMask).Length == 0)
        || (Physics.OverlapSphere(groundCheckTransformBack.position, 1f, playerMask).Length == 0)
        || (Physics.OverlapSphere(groundCheckTransformTop.position, 1f, playerMask).Length == 0))
        {
          
            return;
        }

        if (jumpKeyWasPressed)
        {
            rigidBoddyComponent.AddForce(Vector3.up * 9, ForceMode.VelocityChange);
            jumpKeyWasPressed = false;
        }

       
    }
2

Check out some Youtube tutorials on double-jumping for the basic concepts you need. Those will be:

  1. the notion of “have I touched ground and reset my double jump?” (a boolean that you set when grounded)
  2. detecting jump input at all times, and deciding:
    — is this a normal jump from ground?
    — is this a double jump and do I have the ability? if so, jump and clear my ability to jump again

That’s really all there is to it. Everything else is details about how to make it feel.

3

To go a bit further, you can have an int “maxJumps”, and each time you jump, add 1 to a “currentJumpNumber” counter. Only jump if that’s below the max. When you land, reset to 0. This way you can have any number of jumps, including single, double, etc (maybe powerup/debuff possibility).

Also, any time you see hard-coded values (like 2 and 9 in your example), consider having them be variables. That way you can easily do a powerup like “double jump height” or “3X movement speed”. Look to Invoke() to have a powerup or debuff reset after a certain amount of time. Very straightforward and adds a lot to the game.

1 Like