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Normals Acting Odd

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Old Codger:
I'm building a space freighter. Big sucker. Currently working on the crew cab. It needed windows so I'm working away with the topo knife. I back out and look at my work and something odd is going on on the left side. I have attached screen caps in both rounded and flat shading.

I swear I did everything the same on both sides. They look the same flat. When I am in point mode and select (a) it only shows as a single face. But there are two things going on. #1 the face I cut - only on the left side - shows up flat. #2 the face below the one I cut is showing a crease.

Help! Anybody know what is going on? More importantly, anybody know how to FIX it? I still have the original, uncut shape if necessary. I can also rebuild it. But I'd rather not HAVE to do that. It looks like there's something wonky with the normals.

selden:
Sorry: can't help with this one. I vaguely recall something similar happening to me, but I don't even recall if I managed to fix it or gave up in disgust :(

chuft-captain:
I think I have seen something similar when selecting and detaching groups of faces  ... if I then re-combine the detached parts into a single mesh (Join Solids) it appears that different parts of the resulting mesh are "lit" differently ... almost as if the tangents have been somehow messed-up/changed in the process.

Not sure if this is related to your issue, but seems to exhibit somewhat similar symptoms.

NickE:
It is easy to check the normals of the faces by selecting all the faces.  The ones highlighted in yellow are positive normals and the blue ones are are negative.

Steve:
This could be caused by several things.
1) Two adjacent faces may have one more more duplicate vertices.  Try moving the vertices in point-edit more to see if they separate or not. If so you can join them with the Merge Points command.
2) The smooth angle may be too small. Try increasing it in the Mesh Editor.
3) As mentioned before, the face normals might be opposite. If you turn on the Draw As Clay mode in the top toolbad. Orange faces have normals pointing out, blue ones have them pointing in. You can usually align the faces normals by a) Selecting the back facing face and using the Flip Normals command, or 2) selecting the mesh and applying the Fix Normals command.

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