User:dora Gustafson/Replacing llTargetOmega
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Revision as of 06:38, 12 August 2014 by Dora Gustafson (talk | contribs)
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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
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