What makes it different?

[sasi]

On what factor depends the mass of a prefeb?? .Instructor’s ship starts flying at 0.1, but my ship doesn’t until I reduce it to 0.03.

[Nina]

Hi sasi,

There is a strange bug in Unity which prevents the rocket from flying when it is selected in the Hierarchy. Try to select something else and click into the game window once to set Unity’s focus on the game window again.

If that didn’t work, try to remove Time.deltaTime from the AddRelativeForce method. Alternatively, test this potential solution in the Rocket.cs:

bool isThrusting = false;

private void RespondToThrustInput()
{
    isThrusting = Input.GetKey(KeyCode.Space);

    if (isThrusting)
    {
        ApplyThrust();
    }
    else
    {
        audioSource.Stop();
        mainEngineParticles.Stop();
    }
}

private void ApplyThrust()
{
    if (!audioSource.isPlaying)
    {
        audioSource.PlayOneShot(mainEngine);
    }

    mainEngineParticles.Play();
}

private void FixedUpdate()
{
    if (isThrusting)
    {
        rigidBody.AddRelativeForce(Vector3.up * mainThrust, ForceMode.Acceleration);
    }
}

Did this fix the issue?

[sasi]

Yes the first method worked.