Hi Guys,
I have been working on a model for a while and all has been fine but all of a sudden i have 2 bad objects that weren’t bad before so when I try to join them to the rest of the model those 2 surfaces disappear and if I rebuild them they show up fine in the preview but when I select ok, they also disappear.
Any ideas as to why?
Post a file with the object(s) and explain what you did…
Usually bad surfaces stem from trimming errors.
Duplicate border, then untrim the surface and retrim with the border curve might help.
If this doesn’t work you may need to fix the trimming cuves.