koobas.hobune.stream
C# variable type problem, always get NullRefExc
Hello. I'm playing around in Unity3D 3. I'm rewriting this JS code:
var prefabBullet:Transform;
var shootForce:float;
function Update ()
{
if (Input.GetButtonDown("Fire1"))
{
var clone = Instantiate(prefabBullet, transform.position, transform.rotation);
clone.rigidbody.AddForce(transform.forward * shootForce);
}
}
Into C#:
using UnityEngine; using System.Collections;
public class Shoot : MonoBehaviour {
public Transform bullet;
void Update() {
if (Input.GetButtonDown("Fire1")) {
Transform clone;
clone = Instantiate(bullet, transform.position, Quaternion.identity) as Transform;
clone.rigidbody.AddForce(transform.forward * 1000);
}
}
}
But I always get a "NullReferenceException: Object reference not set to an instance of an object" when I hit my Fire1 button. I think there is a variable type problem, but I cant solve it :( Please help. Thanks, Erhan
Your translation isn't entirely off, but your problem is not one of type and would have happened in the original javascript.
Here's a literal translation of the first script:
using UnityEngine;
public class Shoot : MonoBehaviour { public Transform bullet; public float shootForce;
void Update() {
if (Input.GetButtonDown("Fire1")) {
Transform clone = Instantiate(bullet, transform.position,
transform.rotation) as Transform;
clone.rigidbody.AddForce(transform.forward * shootForce);
}
}
}
For help with translation, this is a useful link.
Your problem is in one of these possible locations:
Instantiate(bullet... - is bullet set to something?clone.rigidbody... - does bullet have a Rigidbody?
You can add some checks to avoid this problem altogether:
using UnityEngine;
public class Shoot : MonoBehaviour { public Transform bullet; public float shootForce = 1000.0f;
void Update() {
if (Input.GetButtonDown("Fire1") && bullet && bullet.rigidbody) {
Transform clone = Instantiate(bullet, transform.position,
transform.rotation) as Transform;
clone.rigidbody.AddForce(transform.forward * shootForce);
}
}
}
