I’ve read many posts asking a similar question to mine, but just can’t find a solution that works for me. I’m making a catapult type object for my game, and I’m trying to fire it and make it land in a certain place.
Currently I’m working on just test code, where you push a button and it fires at the target object. I’ve looked through the physics equations needed to calculate how much force I need to reach a desired target, but have a hard time implementing it in code. Any help is greatly appreciated!
My thought was to find the direction from the two points, and fire at a point in between them at an arbitrary height (being 100 in this case) to create an arc, then add a force based on how far apart the two objects are. Currently, the further away the target is, the farther the object flies - which makes sense from how the code is laid out. I’ve just been stumped on this for a few days now. Thanks! 
Here’s my test code:
using UnityEngine;
using System.Collections;
public class s_ShippingCatapult : MonoBehaviour {
public GameObject axeCrate;
public GameObject shippingObject;
public GameObject target;
public float power;
// Use this for initialization
void Start ()
{
target = GameObject.FindGameObjectWithTag("BuyScreen");
}
// Update is called once per frame
void Update ()
{
if (Input.GetKeyDown(KeyCode.I))
{
shippingObject = Instantiate(axeCrate, gameObject.transform.position, Quaternion.identity) as GameObject;
Rigidbody rb = shippingObject.transform.GetChild(0).GetComponent<Rigidbody>();
Vector3 direction = target.transform.position - gameObject.transform.position;
// fire at the buy menu, with a power based on the distance between the catapult and the tower
rb.AddForce(new Vector3(direction.x / 2, 100, direction.z / 2) * (power * (direction.magnitude)), ForceMode.VelocityChange);
}
}
}