It is not an independent variable, which means it depends on EUpVector. The EFrontVector specifies which axis has the front and back direction in the system. The sign of the EUpVector is applied to represent the direction (1 is up and -1 is down relative to the observer). The EUpVector specifies which axis has the up and down direction in the system (typically this is the Y or Z axis). No conversion will take place if the scene current axis system is equal to the new one. GetUpVector(dir) // this will now return the equivalent of FbxAxisSystem::eZAxis
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