FindScreenWidth

The script below will give the width of the screen in meters by touching anywhere on the visible face, given that the prim is a box with zero rotation and attached at one of the corner HUD attachment points.

<lsl> //Find Screen Width //By Darwin Recreant

default {

   touch_start(integer total_number)
   {
       vector scale = llGetScale();
       vector off_point = llGetLocalPos();
       vector face_pos = llDetectedTouchST(0);
       vector screen_pos = llDetectedTouchPos(0);
       
       float screen_width = ((face_pos.x-.5)*scale.y-off_point.y+screen_pos.y)*2;
       
       llOwnerSay((string)screen_width);
   }

} </lsl>