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Andy · 7th November 2018, 06:49 AM

If multiple surfaces use the same vertices, select-connected will select them all. It's not a good idea to have two surfaces in exactly the same place (which they would be if you are using the same vertices). Use Surface->Optimize-surface to remove duplicates.

If you've got normal lines coming from both sides then there's more than one surface present. Even 2-sided surfaces will only ever have one normal.

A quick way to check is to click-select (to select the closest surface) and drag that surface aside. If there's another underneath you should see it (unless it's using the same vertices, in which case it will have moved as well!). Use Undo (control+z) to undo the movement.

7th November 2018, 06:49 AM	#4
Andy Administrator Professional user Join Date: Jun 2003 Posts: 4,565	Re: New to AC3D from Sketchup If multiple surfaces use the same vertices, select-connected will select them all. It's not a good idea to have two surfaces in exactly the same place (which they would be if you are using the same vertices). Use Surface->Optimize-surface to remove duplicates. If you've got normal lines coming from both sides then there's more than one surface present. Even 2-sided surfaces will only ever have one normal. A quick way to check is to click-select (to select the closest surface) and drag that surface aside. If there's another underneath you should see it (unless it's using the same vertices, in which case it will have moved as well!). Use Undo (control+z) to undo the movement.