Axis orientation
CAD Exchanger uses a right-handed coordinate system having the OZ as an up axis. The recent CAD Exchanger versions have the "Use OY as Up axis" option. If it's enabled, the exported model will be re-oriented accordingly. It's accessible through Menu > Settings > Export Settings, and currently available for the following formats: 3DPDF, Collada, FBX, gLTF, OBJ, U3D, USD.
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My model rotated after conversion. Why it happens?
Different softwares use different axis orientations. That is quite a common thing to occur when a model moves between various 3d software packages. CAD Exchanger uses a right-handed coordinate system. CAD Exchanger Lab offers the axis orientation ...