Rotation of polygon with llDetectedTouch?

Hey, on the beta grid I saw somebody script a sculpted prim so you can put pins into it by clicking on it. The pins would stick out from the sculpted prim based on where you clicked it. They'd always stick outward. I've been trying to figure out how to do something like this myself, but I haven't had any luck. Does anybody know if this is possible on the main grid? I haven't been able to find anything like this.

as for the position, i'm sure they're using llDetectedTouchPos.
for the rotation i'm not sure, rotations confuse me, and i don't really use many scripts that rely on rotations anyways

It might be using llDetectedTouchNormal or one of the related touch functions.

http://wiki.secondlife.com/wiki/LlDetectedTouchNormal

http://wiki.secondlife.com/wiki/Category:LSL_Touch

My head aches thinking of the math. Offhand, I think you'd have to calculate the orientation of the surface at the point where llDetectedTouchUV is triggered and then rez a pin normal to the surface at that point and link it to the prim. That would be enough of a challenge on a standard prim, but I can't begin to imagine how to do it on a sculpty prim. Nice challenge, though.

I think it might be normal, but I'm not sure how to do it with that information.

Hi, here is one way to do it.

// this will rez cones and point them at the center
// of a prim when you touch it

// put a default cone in the prim inventory.
// call it "generic cone"
// it is a cylinder with x and y taper 1.0
// make it temp on rez for great justice

float gConeHeight = 0.25; // HALF the height of the cone (center to tip)

default
{
    touch_start(integer total_number)
    {
        vector center = llGetPos();
        vector touched = llDetectedTouchPos(0);
        
        vector pinSpot = center + (llVecNorm(touched - center) * (gConeHeight + llVecDist(center, touched)));

        llRezObject
        (
            "generic cone",
            pinSpot,
            ZERO_VECTOR,
            llRotBetween(< 0, 0, 1 >, center - touched),
            0
        );
    }
}

hmm, i wonder what happens if you touch an avatar sitting on a prim with this script, could be a new torture device lol, guess it doesn't work with yourself cause touching yourself (sounds so dirty) while you're sat on a prim makes your cam just reset, would probably have to use a sculpted avatar shape fit to about the size of the avatar

Here's what I came up with that looks like it works:

default
{
  

    touch_start(integer total_number)
    {
        llOwnerSay( "Touched.");
        llRezObject( "pointer" ,
                        llDetectedTouchPos(0), 
                        ZERO_VECTOR, 
                        llAxes2Rot( ZERO_VECTOR,ZERO_VECTOR, llDetectedTouchNormal( 0 ) ), 
                        0 );
    }
    
}

One would have to make allowances for the size of the rezzed object and other such complications.

nice suezanne, although, using the pointer from cerise's example ended up sticking in backwards with yours, i just reversed the vector gotten with llDetectedTouchNormal and got much better results with it, even with sculpties, gonna play with some more complex sculpts and see what it does

default
{


touch_start(integer total_number)
{
llOwnerSay( "Touched.");
llRezObject( "Object" ,
llDetectedTouchPos(0),
ZERO_VECTOR,
llAxes2Rot( ZERO_VECTOR,ZERO_VECTOR, -(llDetectedTouchNormal(0)) ),//here's where i changed it
0 );
}

}

someone should totally put this example on the wiki, i have no idea how to

eta:

here's the same thing with an offset

vector offset = < 0,0,0.1>;//remove the space in this vector, had to put it to post in the forum
default
{
touch_start(integer total_number)
{
llOwnerSay( "Touched.");
llRezObject( "Object" ,
llDetectedTouchPos(0) + offset*llAxes2Rot( ZERO_VECTOR,ZERO_VECTOR, llDetectedTouchNormal(0) ),//not reversed here
ZERO_VECTOR,
llAxes2Rot( ZERO_VECTOR,ZERO_VECTOR, -(llDetectedTouchNormal(0)) ),
0 );
}

}