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Function: vector llDetectedTouchST( integer index );

Returns a vector that is the surface coordinates for where the prim was touched. The x & y vector positions contain the horizontal (s) & vertical (t) face coordinates respectively (<s, t, 0.0>). Each component is in the interval [0.0, 1.0] with the origin in the bottom left corner.

TOUCH_INVALID_TEXCOORD is returned when the surface coordinates cannot be determined. See Caveats for further details.

• integer index Index of detection information

index does not support negative indexes. For the touch category of events only. The prim that was touched may not be the prim receiving the event, use llDetectedLinkNumber to check for this; likewise you can use llDetectedTouchFace to determine which face was touched.


  • If index is out of bounds the script continues to execute without an error message.
  • TOUCH_INVALID_TEXCOORD is returned when...
    • The avatar's viewer does not support face touch detection.
    • The touch has moved off the surface of the prim.
    • The touch happened too close to the edge of the face to determine a location.
    • The event triggered is not a touch event.
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<lsl>default {

   touch_start(integer num_detected) {
       integer i = 0;
       for(; i < num_detected; ++i ) {
           vector touchedpos = llDetectedTouchST(i);      
           if (llDetectedTouchFace(i) == -1) {
               llWhisper(0, "Sorry, your viewer doesn't support touched faces.");
           else if ( touchedpos == TOUCH_INVALID_TEXCOORD ) {
               llWhisper(0, "Sorry, the surface touch position could not be determined.");
           else {
               llWhisper(0, (string) touchedpos);
       } // while ...
   } // touch_start

}</lsl> <lsl>vector touchedLoc;

default {

//Draws a cross-hair at the detected Location on the detected face.
   touch(integer num_detected) {
       integer i;
       for (i = 0; i < num_detected; i++) {
           touchedLoc = llDetectedTouchST(i); //What location has been touched?
           llSetPrimitiveParams([PRIM_TEXTURE, llDetectedTouchFace(i), "5ac7995c-4c24-8b60-ae61-6a837619dc75",
                         <1.0,1.0,0.0>, touchedLoc, 180*DEG_TO_RAD]); //Set the Texture Location at the touched location

} </lsl> <lsl> // Sets a grid of WIDTH by HEIGHT and returns a unique number. // The cases of the grid are numbered line by line, left to right, // starting from the bottom.

integer WIDTH = 12; integer HEIGHT = 12; // With a grid of 12x12 (144 cases), you get a number from 0 to 143.

default {

   touch_start(integer total_number)
       vector st = llDetectedTouchST(0);
       integer x = llFloor(st.x * WIDTH);
       integer y = llFloor(st.y * HEIGHT);
       integer button = (y * WIDTH) + x;        
       llOwnerSay("(" + (string)x + "," + (string)y + ") --> " + (string)button);



See Also

Deep Notes


Introduced in Viewer SVN:870 r92872 Branch:Release Wednesday, 23 July 2008, Supported by Beta Server (Wenesday 6th August 2008), and viewer binary 1.20.15 (93532).

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function vector llDetectedTouchST( integer index );