I modeled a teeth and when I add subdivision modifier I have this issue
I tried Auto Smooth but it doesn't solve, how to fix it and thanks in advance.
Some addition pictures
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$\begingroup$ So is that crease supposed to be there at all? $\endgroup$– Allen SimpsonCommented Jan 26, 2022 at 14:32
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$\begingroup$ no there is not crease it at -1. $\endgroup$– Boom BonnesCommented Jan 26, 2022 at 14:49
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$\begingroup$ Please provide blend file $\endgroup$– ChrisCommented Jan 26, 2022 at 15:41
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$\begingroup$ this is link of blend. file : drive.google.com/file/d/1hb1v0KLIx4YlIJYign6OFB4JW7V1WTyK/… $\endgroup$– Boom BonnesCommented Jan 26, 2022 at 16:32
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$\begingroup$ you appear to have two parallel edges at the crease point, possibly duplicate vertices as well. Try selecting all and merging by distance and also removing the extra edges. $\endgroup$– Marty FoutsCommented Jan 26, 2022 at 16:33
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1 Answer
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As you can see in the following image (1), you have Normals pointing the wrong way. Blue facing out and red facing in. To fix this, Select All and press Shift+N to Recalculate Normals. You can also go to Mesh > Normals > Recalculate Outside ( Alt+N ). (2) Once Normals are recalculated to point in the same direction, the creases will be fixed.
Side tip : To visualize Normals like in the image. Check Face Orientation in the Viewport Overlays menu. (3)
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