A FlexySpline is a super spine. The Fk and Ik controls work together and you dont have to choose. It’s also a bit more heavy than the usual PUPbuildSpine

• name: Name of the monk
• Root: The base of the spine. IMPORTANT : The second joint after the root should be at the same place.
• End: The end of the spine. IMPORTANT : The joint before the end should be at the same place.

<aside> 💡 For the list of all options, please check the UI help. It include the exhaustive options explaination.

</aside>

For the animator it comes with some interesting features

• When use with -stricf|||FkIk option (long neck) you can adjust the shape of the ik line with tangent

  

• When use with -strictFkIk option (long neck) and if rigger specify the -fixLength, you can force the spline to have always the same length

  

• if rigger specify the -fineTweak, you have acces to the skinned bone transforms