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I'm following the cup walkthrough on YouTube and for some reason, the inside of my cup has weirdly shaded regions. Is there any way to fix this easily? Or did I have an incorrect setting and I'll have to redo it? I'm entirely new to this software, so any explicit details would be welcome. Thank you very much.

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JosephTLyons
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As said above, in a comment, you should at least - in edit mode - check doubles W and choose "remove doubles" - recalculate normals CTRLN

and in general check that you don't have duplicated geometry.

about the weird shading in the bottom faces, this is what happens, and how to solve (using a simple cylinder):

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what happens is the effect of the bottom face being distorted by the subdivision surface modifier, without having some more supporting geometry to calculate a better shape for that 90° angle between the bottom and the sides.

here is this problem shown as flat shading

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and here with smooth shading: less ugly but still visible.

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To fix this weird bottom shades, we need to add some supporting geometry. In edit mode, add a loop CTRLR

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and slide it down almost to the bottom, confirm.

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Now we need to do something similar for the bottom (n-gon) face.

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Select it and delete (only faces)

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now select this edge circle and extrude E, then press esc to stop the extrusion,

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and instead scale it towards the center, using S

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now extrude the inner circle (selected) again towards the center

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and lastly close the inner small circle left open with F: it will create a small n-gon, but it won't create issues here. It could be converted to triangles or just quads, if needed.

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Now, back into object mode, the subsurf is no more creating those artifact, since ther is now enough geometry on that corner to allow for a nice, uifomr smoothing.

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m.ardito
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  • It seems that removing doubles did nothing, but I selected everything with A and recalculated normals with control + n and that seemed to do the trick. – JosephTLyons Oct 25 '17 at 08:37
  • Also, I’m a complete beginner with Blender, so it might be worth mentioning in your solution to use A to select everything before trying the recalculate normals or removing doubles. – JosephTLyons Oct 25 '17 at 16:22