Prior to this version, Unity's import behaviour was as if this option was always enabled.
This option was introduced in Version 5.3. For best results, avoid using PreRotation, PostRotation and GetRotationPivot. In these situations, animation curves will still be resampled even if the setting is disabled. Notes: -Some unsupported FBX features (such as PreRotation or PostRotation on transforms) will override this setting.
'If set to false, the importer will not resample curves when possible.
