LlTargetOmega Replacement

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/LSL

TargetOmega_Replacement

Summary

Function: KeyFramedOmega( vector axis, float spinrate );

Rotates the object/prim around axis at a rate of spinrate in radians per second

• vector	axis	–	arbitrary axis to rotate the object around
• float	spinrate	–	rate of rotation in radians per second

Specification

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

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

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

Caveats

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

If the center of mass is not at the center of the root, the object will shake and jerk and drift erratically (BUG-7266)

Examples

This 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

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>

Notes

The magnitude of axis do not influence the spinrate

See Also

Functions

llTargetOmega

llSetKeyframedMotion

Deep Notes

Source

The Function

Signature
[[User:Dora Gustafson|Dora Gustafson]] 04:36, 12 August 2014 (PDT)