Liesbeth Levick

So I had a look at this in my personal time out of curiosity (don't want to set an expectation here for the type of answer SideFX employees generally will give). I think I have a solution that matches your second drawing, assuming that's what you ultimately want. I have a switch that either lets you keep the lines parallel and lose a bit of the original shape, or keep the shape and have the lines be less parallel, depending on your needs.

I used a node from our muscle workflow called Fiber Groom, which calculates a direction vector, `materialW`, that corresponds to the longest axis of each piece.

I then used a Match Axis SOP to rotate each piece so that the longest axis aligned with the z-axis, and that allowed me to set up a bunch of grids in the x-axis perpendicular to the surface which I did a Boolean Shatter with to create the lines.

You can then either fuse the original points to the new points, to keep the lines parallel, or fuse the new points to the original points, to preserve the shape.

Finally I used an extract transform and copy to points to rotate the piece back into its original shape.

Kudos to Konstantin Magnus for the idea for the quick setup of the shapes.

I will look at making it more explicit in the docs. I don't think I said it explicity in my talk either, but I assume you've watched my recently released talk on Muscle Transfer? https://www.youtube.com/watch?v=itdoaMumS5k [www.youtube.com]

Your issue is that your source and target bones don't have the same topology. You need to use Otto's bones transferred to Capy as the target bones and Otto's bones as the source bones, or alternatively Capy's bones as the target bones and Capy's bones transferred to Otto as the source bones.