**1-3. NIFF Coordinate System**

NIFF uses the following coordinate system:

Figure Coordinate System for NIFF

Please pay attention to the difference among coordinate systems when making a converter for each of the CG tools.

NIFF describes the vectors that express the rotational axes that define rotation, and their rotational angles. In other words, the positive direction of a rotational axis vector will rotate only the amount of the rotational angle to the right. The units are radians. In light of this, please be careful not to make errors when creating a converter from the various CG tools.