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I am doing this tutorial to make a wine glass with the spin tool. After applying the spin tool, a subdivision surface modifier and the solidify modifier my glass looks like in the image. Somehow I did something wrong resulting in a "crack" in my wine glass. When I did this process again I am sure that I set the spin tool at 36 steps and 360 degrees. What did i forget ? Hope I did not ask a question that what was already answered

enter image description here

here is the blender file

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  • $\begingroup$ Try to remove doubles $\endgroup$
    – Denis
    Aug 11, 2015 at 15:48
  • $\begingroup$ I did remove doubles $\endgroup$
    – user13877
    Aug 11, 2015 at 15:48
  • $\begingroup$ Are there inside faces on the seam? $\endgroup$
    – J Sargent
    Aug 11, 2015 at 15:51
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    $\begingroup$ It looks like you have a face inside the glass wall. $\endgroup$
    – PGmath
    Aug 11, 2015 at 15:52
  • $\begingroup$ i updated my question and added a link to the blender file $\endgroup$
    – user13877
    Aug 11, 2015 at 15:56

1 Answer 1

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It looks like you have a face inside the glass wall, the subsurf modifier does not handle this kind of non-manifold geometry very well.

Look closely, see the face within the wall.
enter image description here

To get rid of it just go into wireframe view and select the spare face and delete it with Del > faces.
enter image description here

Edit:

I looked at your .blend file and since in your particular case you are using a solidify modifier to get the glass thickness you can't directly select the offending faces and delete them. Just go into edit mode and select all with A, then hit W > remove doubles. This will merge the duplicate vertices along the crack.

Here is a comparison:
enter image description here

See how before I removed doubles, when I selected the edge loop at the location of the crack only have “tails” in one direction? This means there are double verts at that location.
enter image description here

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  • $\begingroup$ @JanScherders I just looked at your .blend file and it seems that you are using a solidify modifier. I just hit [W] > remove doubles and it worked fine. $\endgroup$
    – PGmath
    Aug 11, 2015 at 16:09
  • $\begingroup$ you are right !! but before I used the "remove doubles" command in the tool bar and that did not remove the doubles ... Is this another command ??? Anyway, thanks $\endgroup$
    – user13877
    Aug 11, 2015 at 16:22
  • $\begingroup$ @JanScherders You have to select all first, that's all I can think of. They are the same thing. $\endgroup$
    – PGmath
    Aug 11, 2015 at 16:25

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