How do I generate a Random.Range value once, and then use it in void Update to move? Unity, C#

Question

So, I want to generate a random speed and rotation value for the game that I'm (trying) to make, but if I generate the values in the Update function, it will keep generating new values every frame, but if I generate the values in the Start function, the Update function doesn't recognize it: This is the script I have now (which doesn't work):

    void Start()
    {
        float randomRotation = Random.Range(0, 360f);
        float randomSpeed = Random.Range(1f, 5f);
    }

    void Update()
    {
        transform.rotation = Quaternion.Euler(0, 0, randomRotation);
        Vector3 pos = transform.position;
        Vector3 velocity = new Vector3(0, randomSpeed, 0);
        pos += transform.rotation * velocity;
        transform.position = pos;
    }

The problem here is that the Update void does not know what randomRotation means, so it cannot do anything, however if I try public float randomRotation it looks like the whole script gets confused and I get a compiler error: error CS1022: Type or namespace definition, or end-of-file expected Does anyone know how to fix this?

Thanks!

Answer 1

You have to define the randomSeed (and randomRotation ) variable outside of the start function like so:

float randomRotation = 0.0f;
float randomSpeed = 0.0f;

void Start()
{
    randomRotation = Random.Range(0, 360f);
    randomSpeed = Random.Range(1f, 5f);
}

void Update()
{
    transform.rotation = Quaternion.Euler(0, 0, randomRotation);
    Vector3 pos = transform.position;
    Vector3 velocity = new Vector3(0, randomSpeed, 0);
    pos += transform.rotation * velocity;
    transform.position = pos;
}