why is this trimmind / spliting my surface that way … itseams that it is trimmed by their edges in Z-direction
The picture are nice, but we’d rather see your Grasshopper definition and model (if needed).
i m not allowed to give you the file. i have to find a simula problem with splitting surface in an other modle
alxwu, you can internalize your surfaces and curves (right click on parameter -> Internalize data), and attach only the part of the definition where problem arose, not the whole definition.