public void setModelTransformClass(Class<? extends JointModelTransform> modelTransformClass) {
        this.modelTransformClass = modelTransformClass;
        if (jointList == null) {
            return;
        }
        for (Joint joint : jointList) {
            instantiateJointModelTransform(joint);
        }
    }
Sets the JointModelTransform implementation
Default is {@link SeparateJointModelTransform}

@param modelTransformClass which implementation to use
@see JointModelTransform
@see MatrixJointModelTransform
@see SeparateJointModelTransform
jme3-core/src/main/java/com/jme3/anim/Armature.java