private void instantiateJointModelTransform(Joint joint) {
        try {
            joint.setJointModelTransform(modelTransformClass.getDeclaredConstructor().newInstance());
        } catch (InstantiationException | IllegalAccessException
                | IllegalArgumentException | InvocationTargetException
                | NoSuchMethodException | SecurityException e) {
            throw new IllegalArgumentException(e);
        }
    }
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