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