UNITY - Replace onMouseClick with Leap collision in Fruit Ninja like game

[alexdigiuseppe]

Hello, I am developing an application for university in Unity and I started developing it without Leap Motion in mind first. So I have an application in which I have an automatic spawn of apples and if I click on them they slice first into halves, then the halves into quarters. I need to evolve from the mouse click to the collision with the Leap Motion hand. I understood a way to do it is with the onTriggerEnter function, but I can't understand how to use it.

Here's the code

    using UnityEngine;
    using System.Collections;
    
    public class SwipeTrail : MonoBehaviour {

	public GameObject applePrefab;
	public GameObject halfApplePrefab;
	public GameObject quartApplePrefab;
	bool swipeCooldown = true;
	GameObject gObj = null;

// Here I have the trace of the mouse on screen, which is of course not needed for the leap hands.

	Ray GenerateMouseRay (Vector3 touchPos)
	{
		Vector3 mousePosFar = new Vector3 (touchPos.x,
			                     touchPos.y,
			                     Camera.main.farClipPlane);
		Vector3 mousePosNear = new Vector3 (touchPos.x,
			touchPos.y,
			Camera.main.nearClipPlane);
			
		Vector3 mousePosF = Camera.main.ScreenToWorldPoint(mousePosFar);
		Vector3 mousePosN = Camera.main.ScreenToWorldPoint(mousePosNear);

		Ray mr = new Ray(mousePosN, mousePosF-mousePosN);
		return mr;

	}

// Here I have a cooldown after the first click not to cause problems with the click count.
void Cooldown ()
{
swipeCooldown = true;
}

// Here is the main part of the interaction. In this part I should substitute the mouse interaction with the Leap.
	void Update () {



		if ((Input.touchCount > 0 && Input.GetTouch (0).phase == TouchPhase.Moved)
		   || Input.GetMouseButton(0))




		{
			Plane objPlane = new Plane (Camera.main.transform.forward * -1, this.transform.position);
			Ray mRay = Camera.main.ScreenPointToRay (Input.mousePosition);
			float rayDistance;
			if (objPlane.Raycast (mRay, out rayDistance))
				this.transform.position = mRay.GetPoint (rayDistance);




			Ray mouseRay = GenerateMouseRay (Input.mousePosition);
			RaycastHit hit;

			if (Physics.Raycast(mouseRay.origin, mouseRay.direction, out hit) && swipeCooldown)
			{
				gObj = hit.transform.gameObject;
				swipeCooldown = false;
				Invoke ("Cooldown", 1);


				if (gObj.tag == "whole") {
					GameObject h1 = (GameObject)Instantiate (halfApplePrefab, gObj.transform.position, gObj.transform.rotation);
					GameObject h2 = (GameObject)Instantiate (halfApplePrefab, gObj.transform.position, gObj.transform.rotation);
					Destroy (gObj);
				} 



		else if (gObj.tag == "half") 
				{
					GameObject h1 = (GameObject)Instantiate (quartApplePrefab, gObj.transform.position, gObj.transform.rotation);
					GameObject h2 = (GameObject)Instantiate (quartApplePrefab, gObj.transform.position, gObj.transform.rotation);
			        Destroy (gObj);
				}
			}
		}
	}
}

Thank you very much,

Alex