Difference between revisions of "LlDetectedTouchNormal"

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m (Added caveat for legacy sphere prims.)
 
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** The touch has moved off the surface of the prim.
 
** The touch has moved off the surface of the prim.
 
** The event triggered is not a {{LSLGC|Touch|touch}} event.
 
** The event triggered is not a {{LSLGC|Touch|touch}} event.
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* The rotation of a legacy sphere prim does not influence touch normal like it does with other legacy prims.
 
|examples=<source lang="lsl2">
 
|examples=<source lang="lsl2">
 
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Latest revision as of 17:16, 30 November 2021

Summary

Function: vector llDetectedTouchNormal( integer index );

Returns a vector that is the surface normal (perpendicular to the surface) where the touch event was triggered. Along with llDetectedTouchBinormal, this information can be used to find the tangent space at the touch location.

• 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.To find the third tangent vector, cross the binormal with this vector.

Caveats

  • If index is out of bounds the script continues to execute without an error message.
  • TOUCH_INVALID_VECTOR is returned when...
    • The avatar's viewer does not support face touch detection.
    • The touch has moved off the surface of the prim.
    • The event triggered is not a touch event.
  • The rotation of a legacy sphere prim does not influence touch normal like it does with other legacy prims.
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Examples

default
{
    touch_start(integer total_num)
    {
        llOwnerSay((string)llDetectedTouchNormal(0)); //Says the vector where the touched face is pointing to.
    }
}

Useful Snippets

touch_start(integer total_number){
    // rotates the prim, so the touched position points upwards
    llSetRot(llGetRot()*llRotBetween(llDetectedTouchNormal(0),<0,0,1>));
}

See Also

Deep Notes

History

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Signature

function vector llDetectedTouchNormal( integer index );