LlDetectedTouchNormal

Function notes

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.

Return value notes

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.

Caveats

TOUCH_INVALID_VECTOR 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 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.

Examples

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

Helper functions

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

History

Introduced in Viewer SVN:870 r92872 Branch:Release Wednesday, 23 July 2008, no server support, no viewer binary released.
Server support available on preview grid in Second Life Beta Server 1.24, client support in Preview Grid viewer 1.20.15 (93532)
Date of Release Server 29-08-2008
Date of Release Client 16-10-2008

Shared wiki helpers

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