Here is a closed polysurface [2 parts union-ed] and Rhino say it’s a bad object…
But it is closed.
My guess is that the edge tolerance was stretched during the union to exceeds the file tolerance
if so, is there then a way to check/find the location of the bad spots ?
it is not at the edges of the bottom side is checked that with extractSrf, would this be the way to find the problem by a process of elimination? or is there a better way?
*unfortunately I can’t publicly share the file.
with many thanks