koobas.hobune.stream
My 2d spawned bullet prefabs will not fly up, just fall
So this ones weird, my bullets are spawning but when they do they just fall down. IT looks like it has to do with gravity and the rigidbodies, but here is my code anyway:
void Update () {
handleShooting();
handleMove();
handlePause();
}
void handlePause()
{
if (Input.GetKeyDown(KeyCode.Escape))
{
cursorLock = !cursorLock;
}
if (cursorLock == true)
{
Cursor.visible = false;
Time.timeScale = 1;
} else
{
Cursor.visible = true;
Time.timeScale = 0;
}
}
void handleMove()
{
if (cursorLock == true)
{
transform.position = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 10f));
}
}
void handleShooting()
{
if (canShoot == true)
{
shoot();
StartCoroutine(fire());
}
}
void shoot()
{
var bulletBullet = (GameObject)Instantiate(
bullet,
gun.position,
gun.rotation);
bullet.GetComponent<Rigidbody2D>().velocity = bullet.transform.forward * shootVelocity;
Destroy(bulletBullet, 1.2f);
}
any ideas?
Good day.
Can you post a screenshot of the inspector?
Check the Rigidbody compoenent. Unmark the "Use gravity" and mark "is Kinematic".
Bye
Okay, so this is whats weird, my rigidbody 2d doesnt have th option to not use gravity.
It seems the Editor is different for the Rigidbody2D, ins$$anonymous$$d of bool useGravity it has float gravityScale (weird decision to have different interface, in my opinion). Anyway, just set gravityScale to 0 to disable gravity.
I turned gravity off, but now it doesn't move at all. How can I get it to shoott up if theres no gravity?
Is the code still the same as what you posted originally? In that case, the problem is that you instantiate a bullet from the prefab ( bulletBullet), but then assign the velocity to the prefab bullet (I wonder how no one has noticed this so far):
void shoot () {
var bulletBullet = (GameObject)Instantiate(bullet, gun.position, gun.rotation);
bullet.GetComponent<Rigidbody2D>().velocity = bullet.transform.forward * shootVelocity; // <-- this will not affect your bullet!
}
There might be other problems, but this is the first step to make your bullet fly!
Also, you could store your bullet prefab by its Rigidbody2D, and then instantiate as such, so that you don't need to get the component. Like this:
[SerializeField] private Rigidbody2D bullet = null; // variable for prefab to be assigned in Editor
...
void shoot () {
Rigidbody2D bulletInstance = Instantiate(bullet, gun.position, gun.rotation);
bulletInstance.velocity = bulletInstance.transform.forward * shootVelocity;
}
Since you are working in 2D, you probably don't want to use transform.forward. That is the Z axis (blue arrow). In 2D, this axis points directly away from the camera. So it probably isn't doing what you want. And it may look like it's falling because it has gravity checked? Can't be sure without an inspector screenshot. But anyways, try using either transform.up or transform.right (depending on which way your bullet sprite faces) instead, and uncheck gravity if it is checked.
I assume this would work, but I cant test it because I'm being told the only way to stop the falling is to make the gravity zero, but then it cant move at all. Heres the editor if that helps:
