Description

This problem also occurs when the Create Convex Polygons checkbox is checked in the Pen tool.

Steps to Reproduce
  1. Create a 5-sided cylinder in BSP
  2. Go into "Brush Editing" mode
  3. Select the top face and click on the "Optimize" tool

Result: the top face is now split into two faces, and they have a small gap between them due to one vertex being slightly offset from the other one.

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-119206 in the post.

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Fixed
ComponentUE - LD & Art - Modeling Tools - BSP
Affects Versions4.26
Target Fix5.0
Fix Commit17668358
Main Commit17668358
CreatedJul 1, 2021
ResolvedSep 29, 2021
UpdatedDec 1, 2021