Here is the 3dxml of my model.
I used a subdivison surface done with CATIA Imagine and Shape as base surface, which I know better than XShape. so it is not a UV regular surface. yet I can define diagonals to my surface (it is convex surface with 4 boundaries). I thought it was enough for a fish.
to get the diagonal, I used a "Brep, then, Getitem on vertices". it is not so smart on a surface replacement yet (just doing the job quick)
I divide the diagonals evenly and trace the geodesics passing by the divisions of the diagonals.
then I use those geodesics to slice the base surface.
finally, I can colorize the individual slices.
a tutorial would be better, but time... so I save the 3dxml so that you can have a look at the functions used.
I would really be happy by your feedbacks and the final model of the fish by @KP
