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I have this small triangular mesh. Extracted from the main mesh. The scale rotation are set to 1 and 0. yet to the inset not working good way. I want to have a triangular inset which its not making with my mesh. Its created some ngons and extra edges.

enter image description here

Any help or suggestion to inset the face. Thanks

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    $\begingroup$ Your polygon is not a traingle, there is very small edge (top corner) which overlaps quite easily, due to its relative shortness to adjacent edges. Either make a true triangle from it or merge overlapped geometry after inseting or use shipped add-on called "Inset Straight Skeleton", which insets without overlapping. $\endgroup$
    – Serge L
    Commented Aug 13, 2020 at 17:51
  • $\begingroup$ @SergeL Thanks for the suggestion its really awesome addon. I got the perfect result $\endgroup$
    – atek
    Commented Aug 13, 2020 at 17:59
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    $\begingroup$ @SergeL Hello :). Inset Straight Skeleton is a useful but not very well known addon. Please, consider making your comment a full answer :). $\endgroup$ Commented Aug 14, 2020 at 14:39

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Why is it overlapping?

Your polygon is not a traingle, there is very small edge (top corner) which overlaps quite easily with default inset tool, due to its relative shortness to adjacent edges.

How to prevent overlapping?

Either merge overlapped geometry after inseting or use shipped add-on called Inset Straight Skeleton (Blender 2.8x) or Inset Polygon (Blender 2.7x), which insets without overlapping. Actually, add-on automatically merges overlapped geometry on every appearance, creating extra loops.

SE: Inset Straight Skeleton enabling and usage info

Sometimes skeleton inset produces bad geometry (wavy and not even) due to precision issues with merging distance. There is a trick to obtain beter results, it involves scaling:

  1. Scale a polygon in edit mode n times (used n=10 factor for pic example)
  2. Inset with amount * n (inset should be relatively bigger)
  3. Scale 1/n times (everything goes back to initial size)

"Scale trick" pic example: (it is a long polygon, but in perpective view for better visibility)

enter image description here

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