Unlike some native OBJ applications, EI uses a different coordinate space. While viewed from the front view within EI, positive X is right, positive Y is up, and positive Z goes away from the viewer. This is called a left-handed coordinate system. In Wavefront - which is a native OBJ application - positive Z goes toward the viewer. This is called a right-handed coordinate system.

Some OBJs you will be converting will be "right-handed". If you check FlipZ, the resulting FACT will be left-handed and face the same direction in EI as the OBJ did in the source application.

Flip Z-Axis

When this box is checked OBJ2FACT will flip the Z axis of the OBJ to fit it to the EI coordinate space.

Flip Y-Axis

This does basically the same as the Flip Z-Axis option but flips the Y axis instead.

Exchange Y and Z

This option is useful if your dealing with OBJs that come from an application that uses the Z coordinate to store the hight of an object instead the Y axis. Such coordinate systems are common in architectural and CAD applications. This option exchanges all Z coordinates with the Y coordinates which will result in a correct orientation of the model in the EIAS. If your model is upside down after you have converted it using this option just make a new conversion and also enable the Flip-Y option.