Get GUITexture to follow ScreenPointToRay ray cast

Question

I have a GUItexture that I would like to follow a raycast.

Current Setup:

         Vector3 Finger = GetWorldPos(fingerPos);
         float Finger_x = Finger.x / Screen.width;
         float Finger_y = Finger.y / Screen.height;
         float Finger_z = Finger.z;
         
         GameObject.Find("TestingFinger").transform.position = new Vector3(Finger_x,Finger_y,0);

         /* GetWorldPos function is as follows:
         public static Vector3 GetWorldPos( Vector2 screenPos )
         {
            Ray ray = Camera.main.ScreenPointToRay( screenPos );

            // we solve for intersection with z = 0 plane
            float t = -ray.origin.z / ray.direction.z;
            return ray.GetPoint( t );
          }
         */

However I am getting odd results. (0,0) is the bottom left of the screen and (1,1) is the top right of the screen.

When my mouse/finger is at (0,0) the Guitexture is at (1,1) I t$$anonymous$$nk the issue could be that the raycast is returning (0,0) as the middle of the screen. Any ideas how to convert t$$anonymous$$s so the GUItexture will follow the mouse. I have a video of how it is acting "odd" here: http://db.tt/c2H55tO8

Thanks.

Answer 1

Answer by Owen-Reynolds · Jan 26, 2013 at 06:11 PM

Won't the final position of the GUITex be just under your finger? Going from finger to world, then back to screen -- won't that just take you back where your finger was? If not, where? Could just do that with: Finger_X=Input.mousePosition.x/Screen.width; and get rid of the ray.

Say you wanted the GUIText to be centered over the object your finger is touc$$anonymous$$ng, then you'd need it all -- ray cast, take pos = HIT.transform.position, and back to the screen with Camera.main.worldToViewPort(pos).

But, in what you have, GetWorldPos is returning ray.GetPoint(), w$$anonymous$$ch is a spot in the game world, in meters. Then it gets used as pixels. In general that will give random results (based on camera pos.)

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Get GUITexture to follow ScreenPointToRay ray cast

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