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On a Sub.D cylinder(ngon "cap fill type"),i extruded the "cap" to make it round,then inset to flat it.When i apply a different color on the end part(as u see in the pic,sorry for my bad english)i found this artifact.

Only way i could fix was inset another face on it.But what it is and how to avoid it ? Thanks in advance

enter image description here

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  • $\begingroup$ I think it would be useful if you could share the file. $\endgroup$
    – Jackdaw
    Aug 25, 2019 at 21:34
  • $\begingroup$ It's likely an artefact from subdividing the cap. You will notice similar ridges when subdividing a regular cylinder. You can combat this by adding another edge loop to the area where the materials are supposed to transition. $\endgroup$
    – Robert Gützkow ♦
    Aug 25, 2019 at 22:14
  • $\begingroup$ Thank you all ! $\endgroup$
    – JT008
    Aug 26, 2019 at 1:19
  • $\begingroup$ I like your ship, :) $\endgroup$
    – Millard
    Aug 26, 2019 at 3:24
  • $\begingroup$ thx:) thats actually a metal gear rex im trying to do $\endgroup$
    – JT008
    Aug 27, 2019 at 0:16

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This is the sort of pattern that can arise in the transition between 'kite' quads and more regular quads under subdivision

enter image description here

If you can arrange for the transition to be inside a single-material region rather than at the boundary between materials, it doesn't show:

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here, by I insetting the polar region

The Catmull-Clark subdivision algorithm drags newly-created edge-points away from the previous concentrations at one side of a face.. this shows the transition between Simple and Catmull-Clark subdivision:

enter image description here

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  • $\begingroup$ Didn't know about this issue or this fix +1 $\endgroup$
    – hatinacat2000
    Aug 25, 2019 at 23:29
  • $\begingroup$ Thank you very much for your answer! $\endgroup$
    – JT008
    Aug 26, 2019 at 1:21

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