Hi
I can’t understand why some lines in this diagram are darker than others. If I select each line and delete it then I have a white space, so they aren’t double lines. Can anybody help?
Go View/Edge Style and untick Profiles.
The thick lines are showing you the edges that don’t divide two face.
Where you have those lines surrounding what you think is a face, the face is missing.
It can be helpful to use a non white background so you can see holes more easily.
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