-Muscle::Muscle() :
- length(0),
- targetlength(0),
- parent1(0),
- parent2(0),
- maxlength(0),
- minlength(0),
- type(boneconnect),
- visible(false),
- rotate1(0), rotate2(0), rotate3(0),
- lastrotate1(0), lastrotate2(0), lastrotate3(0),
- oldrotate1(0), oldrotate2(0), oldrotate3(0),
- newrotate1(0), newrotate2(0), newrotate3(0),