Shooting bullet

Unity Engine
1

So, I’m trying to do a simple shooting thing. All I need it to do is send a sphere forward from the camera at left click. I have the bullet and the target both set as rigid bodies with gravity and angular drag off. Here’s the script for the bullet:

var isActive:boolean = false;
var playerT:Transform;

function Update () {
	getInput();
	
	if(isActive) {
		transform.position += transform.forward * 10;
	}
}

function getInput() {
	if(Input.GetButton("Fire1")) {
		transform.forward = playerT.forward;
		transform.position = playerT.position;
		isActive = true;
	}
}

function OnCollisionEnter(other : Collision) {
	print("This collider is named: " + other.contacts[0].otherCollider.name);
}

playerT is the transform from the MainCamera. The problem is that after the first collision if I fire the bullet again its forward vector starts to change mid-flight. It starts correct, but then it will start curving. Sometimes it’s so extreme the bullet corkscrews down the range. I’m thinking there is something about rigid bodies that I don’t know about, because it didn’t do this before I made the bullet a rigid body. Thanks.

2

I think that you have to apply a forward force instead of translate. Try something like this:

var explosionPower: float = 2000.0;
//bullet.rigidbody.AddForce(transform.forward * explosionPower);
rigidbody.AddForce(transform.forward * explosionPower);

instead of

transform.position += transform.forward * 10;
3

That didn’t do it. But I fixed it another way. I just reset the location of the bullet to the camera’s location and set isActive to false on collision. Not exactly sure what happened, it’s kind of a dead rat, but whatever. Thanks anyways.

4

Ok, more issues I could use some help with.

Script is attached to bullet object. I have a field variable called muzzleVel, it’s a float with value 2820.

I move the bullet via this line:
transform.position -= transform.forward * (muzzleVel * Time.deltaTime);

The issue I’m having is that changing the value of muzzleVel doesn’t do anything. I can’t imagine why this would be, there must be something I’m missing. I’ll post the whole script below for reference. Thanks.

var timeDilation:float = 0.33;

var isActive:boolean = false;
var playerT:Transform;
var hitMarkerObj:GameObject;

var bulletCam:GameObject;
var mainCam:GameObject;

var muzzleVel:float = 2820; //fps
var flightDistance:float = 0.0;
var RPS:float = 0.0;
var twist:float = 10.0;

function Start() {
	bulletCam.active = false;
}

function Update () {
	getInput();
	
	if(isActive) {
		transform.position -= transform.forward * (muzzleVel * Time.deltaTime);
		flightDistance += (muzzleVel * Time.deltaTime);
		transform.Rotate(0, 0, (360*(RPS*Time.deltaTime)));
		bulletCam.active = true;
		mainCam.active = false;
		bulletCam.transform.position = transform.position - Vector3(1, 0, 1);
		bulletCam.transform.rotation.y = 0;
		bulletCam.transform.Rotate(0, 45, 0);
		if(flightDistance > 3500) {
			isActive = false;
			transform.position = playerT.position;
		}
	} else {
		bulletCam.active = false;
		mainCam.active = true;
	}
}

function getInput() {
	if(Input.GetButton("Fire1")) {
		transform.forward = -playerT.forward;
		transform.position = playerT.position;
		isActive = true;
		flightDistance = 0;
		RPS = (12/twist)*muzzleVel;
	}
}

function OnCollisionEnter(other : Collision) {
	print("This collider is named: " + other.contacts[0].otherCollider.name);
	var hitMarkerGO:GameObject = Instantiate(hitMarkerObj, other.contacts[0].point, Quaternion.AngleAxis(180, Vector3.up));
	hitMarkerGO.transform.position.z -= 20;
	transform.position = playerT.position;
	isActive = false;
}