public void setWalkDirection(Vector3f vec) {
        walkDirection.set(vec);
        character.setWalkDirection(Converter.convert(walkDirection, tempVec));
    }
Set the walk direction, works continuously.
This should probably be called setPositionIncrementPerSimulatorStep.
This is neither a direction nor a velocity, but the amount to
increment the position each physics tick. So vector length = accuracy*speed in m/s
@param vec the walk direction to set
jme3-jbullet/src/main/java/com/jme3/bullet/objects/PhysicsCharacter.java