I'm following this tutorial: https://www.youtube.com/watch?v=jCVEtLjpeB8
And when I add the Subdivision Surface modifier there's a hole at the bottom of my cup. I have no idea why this happens and how to fix it.
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$\begingroup$ Maybe one of your verts isn't in the centre? $\endgroup$– common_goldfishCommented Dec 2, 2022 at 2:30
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$\begingroup$ Can you share the file? Or at least show a screenshot that allows us to see the topology (Edit mode or something). $\endgroup$– mqbaka mqbakaCommented Dec 2, 2022 at 6:40
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$\begingroup$ Anyway, it looks more like an black object overlapping than a hole to me. A hole wouldn't be that dark. But I'm still guessing here. $\endgroup$– mqbaka mqbakaCommented Dec 2, 2022 at 6:41
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$\begingroup$ @mqbakamqbaka I don't know how to post another image into a comment but it looks black on the solid mode, and when I toggle x-ray it just shows the same hole but kinda see-through? It's definitely not an object $\endgroup$– RosieCommented Dec 2, 2022 at 7:24
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$\begingroup$ You can edit you post and post a picture or share the blend file here -> blend-exchange.com and add the link to your post. $\endgroup$– mqbaka mqbakaCommented Dec 2, 2022 at 7:27
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1 Answer
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The problem is that you haven't enabled the Merge option in the Screw modifier. Therefore you have many overlapping vertices in the center area. This creates a bad shading since you have set the object to Shade Smooth but didn't enable the Normals > Auto Smooth option in the Object Data Properties.
Auto Smooth will get rid of the visual effect, but you still have a lot of overlapping vertices, so you should definitely enable the Merge option, otherwise your mesh will stay unconnected in the center. By the way, the inner vertex of the glass bottom is not exactly in the center, so there is a hole. I would select it and set the Y value to 0.
The slightly off vertex:
answered Dec 2, 2022 at 9:47
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$\begingroup$ Is it Blender version related, then? I couldn't seem to have any black dot. $\endgroup$ Commented Dec 2, 2022 at 10:17
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$\begingroup$ @mqbakamqbaka I don't know, might be... which version are you using? The tutorial is for 3.2, I don't know if Rosie's using the same, I am on 3.3.1 $\endgroup$ Commented Dec 2, 2022 at 10:23
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1$\begingroup$ @mqbakamqbaka Might be.. but the good thing is, this way it was possible to detect some flaws in the object ;) $\endgroup$ Commented Dec 2, 2022 at 10:37