Impossible task - detecting landing after jumping.

Questions & Answers
1

For the last 72 hours I have been trying to detect the moment at which my character lands on the ground. For that whole time I haven’t succeded once. Here is my code (without all the solutions I tried, so that you can see everything that DOES work):

	void Update() {

		isGrounded = Physics2D.Linecast (transform.position, groundCheck.position, 1 << LayerMask.NameToLayer("Ground"));

		if (Input.GetButtonDown ("Jump") && isGrounded) {
			jump = true;
		}

	}

	void FixedUpdate() {


		cur_y = transform.position.y;
		delta_y = cur_y - old_y;

		horizontalAxis = Input.GetAxis ("Horizontal");
		verticalAxis = Input.GetAxis ("Vertical");

		if (horizontalAxis != 0f) {
			transform.position = new Vector2 (transform.position.x + (1f * speed * Time.deltaTime * horizontalAxis), transform.position.y);
			anim.SetBool ("Walk", true);
		} else {
			anim.SetBool ("Walk", false);
		}

		if (horizontalAxis > 0f && !facingRight)
			Flip ();
		else if (horizontalAxis < 0f && facingRight)
			Flip ();


		if (jump) {
			anim.SetTrigger("Jump");
			rb.AddForce(new Vector2 (0f, jumpForce));
			jump = false;
		}

		old_y = cur_y;
	}

	void Flip() {
		facingRight = !facingRight;
		Vector3 scale = transform.localScale;
		scale.x *= -1;
		transform.localScale = scale;
	}

I tried setting the trigger “Landed” when my character is grounded, but the jumping animation also starts when the character is grounded, so launching that “Landed” trigger would simply turn off the jumping animation just after the jump has started. Nothing works, I get either inconsistent triggers (that randomly work or don’t work) or just those ones that disable the jumping animation after the jump, so I thought that I would ask you just before I die of starvation. Please help me.

3

I’ve solved this by dividing the jumping animation into jumping that transitions into falling. Animation switches to those states based on whether the y axis movement is positive or negative.

2

OnCollisionEnter should only trigger when the collision begins, not when the character is standing on the ground or jumping off of it. But i guess moving around was triggering it needlessly?

What about storing the value of isGrounded to a field in the end of Update and monitoring when it turns from false to true again? If needed you could tie in the jump variable with this too so that it can only trigger wanted actions when you jump, leave the ground and land again