Distance activated GUI

Questions & Answers
1

hi all, i was woundering if there is a way to active a gui object (like a button) when my character get close to it and deactivates when he is far and WITHOUT using colliders (they are just messy and difficult to use, they'll be my last resort).

My game is a space so it has to be able to go everywhere aswell

here is a copy of my GUI code:

var windowRect : Rect = Rect (20, 40, 127, 70);
var icon : Texture2D;
var customSkin : GUISkin;
var target : Transform;
var place1 : Transform;
var place2 : Transform;
var place3 : Transform;
var place4 : Transform;
var place5 : Transform;

function OnGUI () {
GUI.skin = customSkin;

// Register the window. Notice the 3rd parameter
windowRect = GUI.Window (0, windowRect, DoMyWindow, "");
}

// Make the contents of the window
function DoMyWindow (windowID : int) {

GUI.Label (Rect (6, 1, 2500, 20),  "Object In Area");
if (GUI.Button (Rect (10,20,100,20), "Harvest")){
print ("Got a click");
target = place1;
}
if (GUI.Button (Rect (15,40,100,20), "-Moon Mounter")){
print ("Got a click");
target = place2;
}
GUI.DragWindow (Rect (0,0,10000,10000));

}

function Update () {
var targetPoint = target.position;
    var targetRotation = Quaternion.LookRotation (targetPoint - transform.position, Vector3.up);
    transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, Time.deltaTime * 2.0);

}

Thank you in advance, Lachee

2

Use the Pythagorean theorem: SqRoot[(x1 - x2)^2 + (y1 - y2)^2 + (z1 - z2)^2]. This gives you the distance between 2 points in 3D-Space. If dist < trigger radius, then activate button. You might not want to do this every frame... but if you do it every half-second/quarter-second or so it won't affect your frame-rate that much...

Example:

var radiusOfButton: float = 20.0;
var playerDist: float;
var pPos: Vector3 = transform.position;
var ePos: Vector3 = enemy.transform.position;

playerDist = Mathf.Sqrt((pPos.x-ePos.x)^2 + (pPos.y-ePos.y)^2 + (pPos.z-ePos.z)^2))

if (playerDist <= radiusOfButton){

    if (GUI.Button(Rect(0,0,50,50),"Button")){
        //Do Whatever
    }

}