Systems and methods for impact analysis across multiple domains using non-data types of relationships between objects are provided. A directional input device according to the present teachings includes a light emitter and a shaft having a surface that reflects light from the light emitter. for at least 4 hours, whereby in a lithium tantalate substrate, sparks are prevented from being generated by the charge up of an electric charge on the substrate surface, and thereby destruction of a comb pattern formed on the substrate surface and breaks or the like in the LT substrate are prevented. Furthermore, the method comprises determining a finger gesture which corresponds to the finger movement using a lookup table having multiple preconfigured finger gestures based on the direction data.