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I am in the process of modeling the front of a helicopter and I am having some difficulty in getting the nose of the model to behave the way I'd like it to when applying the Subdivision surface modifier. I have found this post regarding the issue, however the solutions do not work as I have only modeled one half of the helicopter and I am using the Mirror modifier to duplicate the mesh across the X axis. The ngon that is the nose is not a circle but rather a half circle. If I create an additional edge loop and move it closer to the center, the issue is still present and makes the tip of the nose into a point after enabling the subdivision surface modifier.

Here is the model in edit mode without the subdivision surface modifier:

enter image description here

And here is the model with the subdivision surface modifier enabled (problen circled in red):

enter image description here

If I enable "Adjust cage edit to modifier result", you can see that the first edge loop is in a very shallow v pattern:

enter image description here

If I add in a second edge loop that is closer to the center as suggested in the post linked above, the ridged mesh topography is still present, it's just confined to a smaller area and is more pronounced the higher the Subdivision surface level is raised:

enter image description here

By shading the faces smooth rather that flat, the ridges are no longer visible, however, I do not wish to use smooth shading as it does not fit the scene stylistically (think like the game SUPERHOT). Is it possible to remove the ridges that the Subdivision surface modifier creates without applying the Mirror modifier and manually adjusting the mesh topography?

UPDATE:

Because the shape is not a true half circle, but rather a half elipse, when attempting to convert the single center vertex to edge loop vertices on the same coordinate, they do not scale properly, Here is the result of performing the suggested answer from Shady Puck (with the "Adjust cage edit to modifier result" turned on in edit mode for clarity):

enter image description here

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  • $\begingroup$ See blender.stackexchange.com/questions/6425/…. This is because of triangle fan in the nose of the model. It's better to remodel it.. $\endgroup$ – Mr Zak Jul 18 '16 at 21:47
  • $\begingroup$ Have you tried applying the Subdivision Surface Modifier after the Mirror Modifier? $\endgroup$ – Rick Riggs Jul 18 '16 at 21:51
  • $\begingroup$ @MrZak, can you elaborate how to remodel it? as the question stated, I've already tried to add additional edge loops and having a single ngon looks terrible $\endgroup$ – вʀaᴎᴅᴏƞ вєнᴎєƞ Jul 18 '16 at 21:54
  • $\begingroup$ @RickRiggs, the Subdivision surface is after mirror modifier. $\endgroup$ – вʀaᴎᴅᴏƞ вєнᴎєƞ Jul 18 '16 at 21:54
  • $\begingroup$ Some ideas posted here btw - blender.stackexchange.com/questions/3199/…. In general, you can leave ngon only if there's a flat surface (aka one around nose) and surround it with quads. $\endgroup$ – Mr Zak Jul 18 '16 at 22:43
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You just need to remove the single vertex, then extrude the inner rings until you can fill the final loop with an ngon. If it's small enough, the ngon should look okay.

enter image description here

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Start:

enter image description here

End:

enter image description here

Instead of having the center point be a single vertex, have it be a half loop cut of vertices all at the same (X, Y, Z) Coordinate.

Here's how you can do this.

  1. Select the center vertex.
  2. Key Shift + S to open the snap menu and choose Cursor to Selected.
  3. Key . to set the Pivot Center to 3D Cursor.
  4. Key X to open the delete menu and select Vertices.
  5. Key Alt + RMB RMB to select the nearest edge loop.
  6. Key E, then S, then 0, then Enter.
  7. Key Ctrl + R to position a loop cut in between the center vertices and the next edge loop. LMB LMB and then immediately RMB RMB.
  8. Key T to toggle open the Toolshelf. Under Loop Cut and Slide, set the Factor: value to -0.995.

The procedure:

enter image description here

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  • $\begingroup$ I just tried this and it works and it doesn't work. the starting shape is not a true half circle, but rather a half oval. I really wish I could put a picture in the comment to show you. $\endgroup$ – вʀaᴎᴅᴏƞ вєнᴎєƞ Jul 18 '16 at 22:01
  • $\begingroup$ @вʀaᴎᴅᴏƞвєнᴎєƞ You could edit your question and add another picture. $\endgroup$ – Shady Puck Jul 18 '16 at 22:03
  • $\begingroup$ Question has been updated. $\endgroup$ – вʀaᴎᴅᴏƞ вєнᴎєƞ Jul 18 '16 at 22:14
  • $\begingroup$ @вʀaᴎᴅᴏƞвєнᴎєƞ Ok, I'd say either lessen the Factor: to .99 or low enough until it looks right or upload a .blend file to Blend Exchange and I'll look at it. $\endgroup$ – Shady Puck Jul 18 '16 at 22:21
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This artifact is a consequence of how the SubSurf Modifier subdivides triangles.

The best solution is to add an edge loop like you did in the last image, but before committing your change, slide the edge loop very very close to the point.

Alternately, you could use the knife tool to cut an edge very close to the point.

Either way, your objective should be to turn those triangles into quads so that SubSurf has a better chance of smoothing them the right direction.

The BEST solution would be to NOT use a SubSurf Modifier. SubSurf is really not suited to the low-poly style because it likes to be smooth and curvy, not angular and simple. Just make the geo you need, and make it look the way you want.

Don't try to draw a straight line with a compass, just use a ruler ;-) This kind of compass... not the navigation tool

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