Talk:Hierarchics

Default Rotation etc

It's a good script but the rotation code leaves much to be desired. If the user specifies in the objects description that it should have a zero rotation, the script currently ignores it. Additionally it forces the user to use Euler notation. You need something like the following, it allows the user to supply either a quaternion on Euler. <lsl> rotation AngleString2Rot(string in, rotation bad){

   //we test if it is an angle type we can use by:
   //1) parse input and see if it has a value
   //2) flip the sign of an element and test again.
   rotation r = (rotation)in;
   if(r)//it's a rotation (or something greater)
       return r;//by greater it might be <x,y,z,s,...>

   vector v = (vector)in;
   if(v)// it's not a rotation but it is a vector
       return llEuler2Rot(v * DEG_TO_RAD);

   //now it's either default or invalid
   //to determine which, we modify the input string and test agian
   //if it passes, we know the result should be ZERO_ROTATION
   integer index = llSubStringIndex(in, "<");
   if(~index)
   {
       //we insert a negative sign 
       //but we have to remove spaces or they will cause problems
       //we don't care about negative negative zero because
       //breaking the parse is an indication that it did parse.
       in = llGetSubString(in, 0, index) + "-" + 
           llStringTrim(llDeleteSubString(in, 0, index), STRING_TRIM_HEAD);

       if((string)((vector)in) != (string)v)
           return r; 
       //r is Identity but could have negative zero's, waste not want not.
       //the user specified them, we should preserve them.
   }
   return bad;

} </lsl> -- Strife ^{(talk|contribs)} 20:46, 6 May 2009 (UTC)