2D Animation Controller woes

Hi everyone

I'm trying to make my very first 2D platformer, but I've run into a few problems with the animation aspects.. I have the Animator set up with a trio of animations which run in a loop; Idle --> Jump --> Fall --> Idle. I've checked the Parameters in Play mode and they work a treat. I've got my Animator declared as a Public Animator variable and plugged in the correct Animator on the Inspector. I've also declared Animator, called Anim, with the GetComponent<> function and declared the Parameter-Variables' values in Start.

To be clear, I have a VerticalMovement float and an onGround boolean. The player starts on the ground so VerticalMovement is 0.0f, and onGround is True. The Parameters for each change are;

• Idle --> Jump (VerticalMovement Greater then 0.1)

• Jump --> Fall (onGround = false)

• Fall --> Idle (onGround = true, VerticalMovement Less then 0.1)

Here's the code for the Jump Input, which is inside an Update;

         if (Input.GetButton ("Fire1") && Time.time > nextjump) {
             nextjump = Time.time + jumprate;
             rb2d.AddForce (new Vector3 (0.0f, jumpHeight, 0.0f) * speed);
             verticalMovement = 1.0f;
             onGround = false;
         }

So to be clear I'm trying to change the parameters for the Animator to change to the relevant animation. Do I need to use the Anim.Play() thing or is that irrelevant? (BTW I tried adding Aim.Play("Jump") whilst writing this underneath onGround = false, which plays Jump, goes straight to Fall and then loops Fall endlessly.)

I appreciate this is long-winded but if anyone can help I would be really appreciative!