llDetectedTouchUV

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Revision as of 14:25, 8 November 2012 by Kireji Haiku (talk | contribs) (changed example scripts to be similar like on llDetectedTouchST with different wording in the scripts of course)
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Summary

Function: vector llDetectedTouchUV( integer index );

Returns a vector that is the texture coordinates for where the prim was touched. The x & y vector positions contain the u & v texture coordinates respectively (<u, v, 0.0>). Like llDetectedTouchST, the interval of each component will be [0.0, 1.0] unless the texture repeats are set to a non-default value. Increasing or decreasing the texture repeats of the face will change this interval accordingly. Additionally, unlike with llDetectedTouchST, changing a texture's rotation will change the results of this function.

TOUCH_INVALID_TEXCOORD is returned when the touch UV 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.
    • 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.
All Issues ~ Search JIRA for related Bugs

Examples

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

default {

   touch_start(integer total_number)
   {
       integer touchFace = llDetectedTouchFace(0);
       vector touchUV = llDetectedTouchUV(0);
       float touchU = touchUV.x;
       float touchV = touchUV.y;

       if (touchFace == -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 (touchUV == TOUCH_INVALID_TEXCOORD)

// {

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

// }

       else

// {

           llSay(PUBLIC_CHANNEL, "llDetectedTouchUV(" + (string)touchUV + ")"
                   + "\ntouchUV.x = " + (string)touchU
                   + "\ntouchUV.y = " + (string)touchV);

// }

   }

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

integer numberOfRows = 12; integer numberOfColumns = 12;

default {

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

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

}

</lsl>

See Also

Deep Notes

History

Search JIRA for related Issues

Footnotes

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

Signature

function vector llDetectedTouchUV( integer index );