i hoped that with some tricks _filletSrf might be able to indicate the areas that do not offset - and give the trim curves ( the edges of the _filletSrf - surface) to get rid of the parts before _offsetSrf
but i ended up in a few crashes … created another topic:
this is the workflow i hoped for. but it crashes rhino:
left: self-intersecting offsetSrf
middle: filletSrf R50 after surface was trimmed in 2 parts.
right - trim the surface and offset the vaild parts to get a sharp corner…
