Can anybody tell me how to avoid these nasty artifacts that make the flag look like it is broken on the folding part. They are shown in the Viewport and final rendering. Here is a still from the 15 second animation. I should mention that I created this flag with the "Import>Images as Plane" add-on.

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It is a simple mesh, just a plane with subdivisions. The problem began when I started messing with the Force Fields and Physics.

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  • 1
    $\begingroup$ If it looks broken, it problay is ... you sure that mesh is fully robust to start with? Maybe make a test blend file with just the mesh and upload to blend-exchange.giantcowfilms.com $\endgroup$
    – Moog
    Oct 18 '19 at 23:29
  • $\begingroup$ I haven't seen this behavior if there aren't splits in the mesh. Maybe try selecting all vertices, pressing Alt+M and selecting merge by distance to see if they're all unique or if there are some vertices that are doubled up. Down at the bottom it will say how many vertices were removed. $\endgroup$
    – Blazer003
    Oct 19 '19 at 6:04
  • $\begingroup$ I did the "Merge by distance" thing but it didn't help. The issue is more noticeable when viewed from the back (fourth image above). $\endgroup$
    – Tony Tech
    Oct 19 '19 at 14:16

After further investigation and testing, I discovered that the artifacts were created by the "Blend Mode" settings in the "Material" tab. Selecting "Opaque" instead of "Alpha Blend" seems to fix the problem but creates a different type of artifact that could be corrected by checking the "Backface Culling" button which once again brings other sort of issues.


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