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Position objects around other object forming a circle

I have an object at some position. I need to spawn other objects and place them at random positions around this object, forming a circle with center on the first object and at some x distance(radius) from it. How can i calculate the transform position that i need to place the objects ?

Thank You

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asked Sep 26 '11 at 01:26 AM

fgmanfredini gravatar image

fgmanfredini
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1 answer: sort voted first

You can use the function below - it returns a Vector3 position with the center and radius specified:

function RandomCircle(center:Vector3, radius:float): Vector3 {
    // create random angle between 0 to 360 degrees
    var ang = Random.value * 360;
    var pos: Vector3;
    pos.x = center.x + radius * Mathf.Sin(ang * Mathf.Deg2Rad);
    pos.y = center.y + radius * Mathf.Cos(ang * Mathf.Deg2Rad);
    pos.z = center.z;
    return pos;
}

// How to use:

    var center = transform.position;
    for (i = 0; i < numObjects; i++){
        var pos = RandomCircle(center, 10);
        // make the object face the center
        var rot = Quaternion.FromToRotation(Vector3.forward, center-pos);
        Instantiate(prefab, pos, rot);
    }
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answered Sep 26 '11 at 01:49 AM

aldonaletto gravatar image

aldonaletto
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Thanks for your help, to make the funktion RandomCircle work you need to add "return(pos);" at the end

Jul 30 '12 at 10:46 AM maglat

You're right, @maglat - I just forgot the return pos; instruction!

Jul 31 '12 at 12:33 AM aldonaletto

I would also suggest you check out Random.insideUnitCircle(), which returns a random point in the unity circle which can be normalized then multiplied by your radius to get what you want. That being said the (blasted) thing returns a Vector2, so Aldo solution certainly better, if not more efficient.

Jul 31 '12 at 02:12 AM Avaista
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asked: Sep 26 '11 at 01:26 AM

Seen: 3936 times

Last Updated: Jul 31 '12 at 02:12 AM