Hinge help please

Im trying to make a hinge that will rotate back and forth. Although it does rotat back and forth, each rotation moves the hinge furthr and further around the y axis. The second motion seems to double the first motion no matter what inputs I use so it progresses around and around. Here is the scroll if anyone will be kind enough to tell me what I'm doing wrong.

Thanks in advance


default
{
state_entry()
{

// a rotation of 45 degrees around the x-axis
rotation y_45 = llEuler2Rot( <0, 0, 90 * DEG_TO_RAD>;

rotation y_b45 = llEuler2Rot( <0, 0,-90 * DEG_TO_RAD>;

rotation new_rot = y_45 * llGetRot();

rotation bak_rot = y_b45 * llGetRot();
// compute local rotation
llSetRot(new_rot);

llSleep(.20);

llSetRot(bak_rot);
// orient the object accordingly

}

touch_start(integer total_number)
{
llSay(0, "Touched.";
}
}

Try something like:

rotation rot = llGetLocalRot();
rotation delta = llEuler2Rot(<0, 0, -PI/4>);
rot = delta * rot;
llSetLocalRot(rot);

llSleep(0.20)

rotation rot = llGetLocalRot();
rotation delta = llEuler2Rot(<0, 0, PI/4>);
rot = delta * rot;
llSetLocalRot(rot);

PI/4 = 45 degrees rotation
PI/2 = 90
PI = 180
TWO_PI = 360

Rather, try this working code :

default
{
    touch_start(integer num_detected)
    {
        rotation target_rot_f = llEuler2Rot(<0, 0, -PI/4>);
        rotation new_rot_f = target_rot_f * llGetLocalRot();
        llSetLocalRot(new_rot_f);
        
        llSleep(1.0);
        
        rotation target_rot_b = llEuler2Rot(<0, 0, PI/4>);
        rotation new_rot_b = target_rot_b * llGetLocalRot();
        llSetLocalRot(new_rot_b);
    }
}

What...I had to put default and state_entry on it? Hehe...

Well put your code in there and see what happens.