llDetectedTouchST

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/LSL

DetectedTouchST

llDetectedTouchST

Summary

Function: vector llDetectedTouchST( integer index );

342	Function ID
0.0	Forced Delay
10.0	Energy

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.^[1]

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.

Caveats

• 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.
    • To check if face touch detection is supported check the return of llDetectedTouchFace.
  • 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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Examples

<lsl> // whisper touched location upon face

default {

   touch_start(integer num_detected)
   {
       integer detectedFace = llDetectedTouchFace(0);
       vector detectedTouchST = llDetectedTouchST(0);

       if (detectedFace == -1)

// { // PUBLIC_CHANNEL has the integer value 0

           llWhisper(PUBLIC_CHANNEL, "Sorry, your viewer doesn't support touched faces.");

// } // TOUCH_INVALID_TEXCOORD has the vector value <-1.0, -1.0, 0.0>

       else if (detectedTouchST == TOUCH_INVALID_TEXCOORD)

// {

           llWhisper(PUBLIC_CHANNEL, "Sorry, the surface touch position could not be determined.");

// }

       else

// {

           llWhisper(PUBLIC_CHANNEL, (string)detectedTouchST);

// }

   }

} </lsl> <lsl> // with friendly permission of Supremius Maximus // who made the texture used in this script // // click&hold the mouse while dragging across // the face of the prim

default {

   touch(integer num_detected)
   {
       integer face = llDetectedTouchFace(0);
       vector touchST = llDetectedTouchST(0);

       string uuid = "23badbe7-6d8c-639b-0131-bb321f8e9db5";

       llSetLinkPrimitiveParamsFast(LINK_THIS, [
           PRIM_TEXTURE, face, uuid, <1.0, 1.0, 0.0>, touchST, (float)FALSE,
           PRIM_FULLBRIGHT, ALL_SIDES, TRUE]);
   }

} </lsl> <lsl> // touchST.x goes across from the left to the right // touchST.y goes up from the bottom to the top // <0.0, 0.0, 0.0> is in the bottom left corner

integer numberOfRows = 12; integer numberOfColumns = 12;

default {

   touch_start(integer total_number)
   {
       vector touchST = llDetectedTouchST(0);
       integer columnIndex = llFloor(touchST.x * numberOfColumns);
       integer rowIndex = llFloor(touchST.y * numberOfRows);
       integer cellIndex = (rowIndex * numberOfColums) + columnIndex;

       llSay(PUBLIC_CHANNEL, "(" + (string)columnIndex + ", " + (string)rowIndex + ") --> " + (string)cellIndex);
   }

} </lsl> <lsl> // touchST.x goes across from the left to the right // touchST.y goes up from the bottom to the top // ZERO_VECTOR (<0.0, 0.0, 0.0> ... the origin) is in the bottom left corner

default {

   touch_start(integer total_number)
   {
       vector touchST = llDetectedTouchST(0);
       float touchS = touchST.x;
       float touchT = touchST.y;

       llSay(PUBLIC_CHANNEL, "llDetectedTouchST(" + (string)touchST + ")"
                   + "\ntouchST.x = " + (string)touchS
                   + "\ntouchST.y = " + (string)touchT);
   }

}

</lsl>

See Also

Events

•	touch_start
•	touch
•	touch_end

Functions

•	llDetectedLinkNumber
•	llDetectedTouchFace
•	llDetectedTouchUV
•	llDetectedTouchPos
•	llDetectedTouchNormal
•	llDetectedTouchBinormal

Articles

•

Detected

Deep Notes

History

Introduced in Viewer SVN:870 r92872 Branch:Release Wednesday, 23 July 2008, Supported by Beta Server 1.24.0.93754 (Wenesday 6th August 2008), and viewer binary 1.20.15 (93532).

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Footnotes

1. ^ The ranges in this article are written in Interval Notation.

Signature
function vector llDetectedTouchST( integer index );