How to change the speed of a projectile?

Questions & Answers
1

hi. im new to unity. i am creating a simple shooting game. I am using the unity code for a first person shooter (below), but want to know how i can change the speed of the bullet, and how to “turn off gravity”.

var projectile : Rigidbody;
var speed = 20;

    function Update()
    {
        if( Input.GetButtonDown( "Fire1" ) )
        {
            var instantiatedProjectile : Rigidbody = Instantiate(
        projectile, transform.position, transform.rotation );

            instantiatedProjectile.velocity =
        transform.TransformDirection( Vector3( 0, 0, speed ) );

            Physics.IgnoreCollision( instantiatedProjectile. collider,
        transform.root.collider );
    }
}

Thanks!!

2

About the speed of the bullet when it is shot, that’s what the speed variable is for. While it’s on air though, you’ll need a reference on that bullet and do bullet.rigidbody.velocity *= something;

The gravity is in Physics.gravity.

3

You can set instantiatedProjectile.useGravity to false to disable gravity. About the projectile speed, it’s defined by the variable speed, as @Berenger said. Once fired, the projectile keeps its velocity constant for the eternity (unless gravity is enabled or Drag isn’t zero).

var projectile : Rigidbody;
var speed = 20; // this sets the speed in meters/second

function Update()
{
        if( Input.GetButtonDown( "Fire1" ) )
        {
            var instantiatedProjectile : Rigidbody = Instantiate(
        projectile, transform.position, transform.rotation );
            instantiatedProjectil.useGravity = false; // disable gravity
            // set the bullet speed:
            instantiatedProjectile.velocity = transform.TransformDirection( Vector3( 0, 0, speed ) );
            Physics.IgnoreCollision( instantiatedProjectile. collider,
        transform.root.collider );
    }
}