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In short this is probably bad Topology causing Subdivision surface not to work as expected, and also create unknown problems for Solidify modifier.

Problem 1

I'm very new in Blender, I'm trying to make an old lock to improve my skill. I use "Subdivision surface" to mimic the round button and add "Bevel" to give its edge finish. It looks fine from outside, but inside the raised part it seems "Subdivision surface" can't find enough geometry. Its corner and edge doesn't look right. I may need to improve the topology according to other people's post, what should I change in the topology? I try to Bevel this part myself but it affects the Bevel modifier to round other parts.

enter image description here(reference picture find on internet)

enter image description here(model without modifier)

enter image description here(after Bevel + Subdivision surface)

enter image description here (Subdivision surface create unwanted surface at inside corner, the edge gets bend to curve, and the shape of hole doesn't connect correctly. lack of clear geometry according to other people's post questions.)

Problem 2 - Unknown problem about Solidify result

Caused by Problem 1, I guess.

I add "Solidify" to make thickness, but as the picture show below, some strange thing is sticking out of my model. why this happen?

enter image description here

Edit according to comment(Edit after posting according to comment)

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  • $\begingroup$ Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. $\endgroup$
    – Community Bot
    Jan 24, 2023 at 10:20
  • $\begingroup$ You should put the Solidify above the Subdivision Surface. The rest seems to work as expected. For the base of your shape that is smoothed it is normal considering your topology. If you are a beginner maybe you should not work with modifiers like Bevel but instead create real bevels, you would understand better how it works? $\endgroup$
    – moonboots
    Jan 24, 2023 at 10:44
  • $\begingroup$ Sorry, I try to put the Solidify above the Subdivision Surface, but the plate become rounded on every edge now. It now lose the iron plate edge cut place. $\endgroup$
    – moomoo
    Jan 24, 2023 at 10:50
  • $\begingroup$ I will try Bevel myself later, I often regret on the bevel result and need to redo the model. $\endgroup$
    – moomoo
    Jan 24, 2023 at 10:57

1 Answer 1

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Turn on Face Orientation in the Overlays menu so you can see the problem.

enter image description here

Notice that when the Bevel Amount exceeds $0.0074m$ it becomes problematic because it goes beyond geometry boundaries. Your bevel is at $0.01m$ which is way beyond the limit for your particular mesh.

enter image description here

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  • $\begingroup$ Thanks a lot, I now see there are multiple red dots appearing at certain angles around the model. I will adjust these overlaps from beyond bevels. $\endgroup$
    – moomoo
    Jan 24, 2023 at 12:25

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