orbita luna attorno alla terra con scia

float index;
vector centro;
float raggio=0.5;
float z;



default
{
    state_entry()
    {
        llSay(0, "Script running");
        //llSensorRepeat("TERRA",NULL_KEY,ACTIVE,20.0,PI,0.01);
        llListen(100,"",NULL_KEY,"");
        llSensorRemove();
    }
    listen(integer channel,string name,key id,string str)
    {
        if(str=="ON") llSensorRepeat("TERRA",NULL_KEY,ACTIVE,20.0,PI,0.1);
        if(str=="OFF") llResetScript();
    }
    sensor(integer count)
    {

        centro=llDetectedPos(0);
        index+=PI/20; if(index>2*PI) index=0;
        vector coord=centro+<raggio*llCos(index),raggio*llSin(index),0>;
        llSetLinkPrimitiveParamsFast(0, [ PRIM_POSITION, coord ]);
        llRezObject("punto",llGetPos(),ZERO_VECTOR,ZERO_ROTATION,0);
    }
}