public Vector3f getForwardVector(Vector3f vector) {
        if (vector == null) {
            vector = new Vector3f();
        }
        vehicle.getForwardVector(tempVec);
        Converter.convert(tempVec, vector);
        return vector;
    }
Get the current forward vector of the vehicle in world coordinates
@param vector The object to write the forward vector values to.
Passing null will cause a new {@link Vector3f} to be created.
@return The forward vector
jme3-jbullet/src/main/java/com/jme3/bullet/objects/PhysicsVehicle.java