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I am applying the Subdivision Surface modifier on the model of a queen chess piece. Does anyone know why some of the crown's horns are modified like in the second picture? The topology seems to be exactly the same for each individual horn. My desired outcome is for all the horns to remain pointy.

Model without the Subdivision Surface modifier

Model with the Subdivision Surface modifier applied

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    $\begingroup$ Hello, could you please share your file? blend-exchange.giantcowfilms.com $\endgroup$ – moonboots Jun 20 '20 at 10:41
  • $\begingroup$ it's quite strange that you have a vertex on the top of the horn.. you should have something like this: i.imgur.com/9R77K5m.png $\endgroup$ – Sanbaldo Jun 20 '20 at 11:14
  • $\begingroup$ @Sanbaldo Thanks, this solved my issue. Here's the result: imgur.com/a/P3TYaOt Nonetheless, I'm still curious if there's an explanation why the modifier behaved like that in the first case. $\endgroup$ – Alex Palko Jun 20 '20 at 11:33
  • $\begingroup$ It seems like that the sharp horns have double vertices, try to remove them with merge by distance. Aft that us the knife tool to cut the horns close to the corner that will be enough to make them sharp. $\endgroup$ – VeloFX Jun 20 '20 at 11:34
  • $\begingroup$ @VeloFX I did something similar to that; link is in the post above. However there weren't any double vertices. $\endgroup$ – Alex Palko Jun 20 '20 at 11:47
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Actually your topology should not allow to have sharp tips, it's just because some of your faces are flipped that you get them sharp, if you recalculate the normals you'll have the same result:

enter image description here

To fix this, bring some edge loops with the knife (K to activate, Z to cut through):

enter image description here

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  • $\begingroup$ Thank you! I did get the look I wanted by adding edge loops, but I was still curious why some horns remained sharp while others didn't in the first situation. I did not think about checking the normals. $\endgroup$ – Alex Palko Jun 21 '20 at 7:54

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