User:Dora Gustafson/Replacing llTargetOmega

Replacing llTargetOmega with a Key Framed Motion

This doesn't make llTargetOmega redundant but in some cases a Key Framed motion may be preferred

The routine: "KeyFrameOmega" is easy to use for llTargetOmega: It takes the first two parameters in llTargetOmega: axis and spinrate

The included script shows how to use the routine to start, stop and reverse a spin on repeated touches

<lsl> // llTargetOmega substitution by Dora Gustafson, Studio Dora 2014 // The script must be in the root prim // It can not spin child prims // The object must be convex hull physics type // Can not spin physical objects // The parameters are the same as the two first for llTargetOmega // All viewers will see the same spin and rotation // The object will keep the rotation it has when spin is stopped // A spin will continue even when the script is deleted

integer P;

KeyFramedOmega( vector axis, float spinrate) {

   llSetKeyframedMotion( [], []);
   if ( spinrate )
   {
       float v = TWO_PI/3.0;
       if ( spinrate < 0 ) v = -v;
       list L = [llAxisAngle2Rot( axis/llGetRot(), v), v/spinrate];
       llSetKeyframedMotion( L+L+L, [KFM_DATA, KFM_ROTATION, KFM_MODE, KFM_LOOP]);
   }

}

default {

   state_entry()
   {
       llSetPrimitiveParams([PRIM_PHYSICS_SHAPE_TYPE, PRIM_PHYSICS_SHAPE_CONVEX]);
   }
   touch_end( integer n)
   {
       P = ++P%4;
       if ( P == 1 ) KeyFramedOmega( <0,0,1>, 2.0);       // Positive spin
       else if ( P == 3 ) KeyFramedOmega( <0,0,1>, -2.0); // Negative spin
       else KeyFramedOmega( <0,0,1>, 0.0);                // Stop spin
   }

}</lsl>