Time of Day / amount of light

Is there any way to detect the amount of ambient light to turn on lights? Or is the only way to approximate based on the time of day as found in the wiki at http://secondlife.com/badgeo/wakka.php?wakka=llGetSunDirection?

Thanks!

I've done this before.. In a very simple on/off way, you can do this:

default {
   state_entry() {
      llSetTimerEvent(4);
   }
   timer() {
      vector sun = llGetSunDirection();
         if(sun.z > 0) {
            llSetPrimitiveParams([PRIM_MATERIAL,PRIM_MATERIAL_GLASS]);
            llSetPrimitiveParams([PRIM_PHANTOM, TRUE]);
            llSetAlpha(0.01, ALL_SIDES);
         }
         else {
           llSetPrimitiveParams([PRIM_MATERIAL,PRIM_MATERIAL_LIGHT]);
           llSetPrimitiveParams([PRIM_PHANTOM, TRUE]);
           llSetAlpha(0.20, ALL_SIDES);
         }
   }
}

If you want more granularity, change the sun.z math. Like so:

         if ((sun.z > 0.0) && (sun.z < 0.10)) {
             play_sound();
         }
         
         if ((sun.z > 0.10) && (sun.z < 0.50)) {
            setcolors1();
         }
         
         if ((sun.z > 0.50) && (sun.z < 0.60)) {
             updateParticles1();
             llSetColor(<0,0,0>, -1);
         }
         
         if ((sun.z > 0.60) && (sun.z < 0.70)) {
             updateParticles2();
             llSetColor(<0,0,0>, -1);        
         }

etc... Night time also works, its just negative.

this script looks at the sun or the moon.

        if ((sun.z > 0.01) && (sun.z < 0.99)) {
            llLookAt(llGetPos() + sun,1,0.1);
        } else {
            llLookAt(llGetPos() - sun,1,0.1);
        }