Hello, everyone.
We've improved the prefab system of UModeler because the existing method has some issues which can't be resolved. This update may affect the existing UModeler prefab instances so I recommend that you'll back up your project before upgrading your UModeler.
Version 2.9.18 - October.17.2022 - PushPull tool : Fixed an issue where the adjacent polygons disappeared when you started to push or pull a polygon. - Prefab workflow : UModeler’s prefab workflow has been improved in this update. Now UModeler prefab instance can be edited only in the Prefab Editor. Please read this document before updating UModeler.
Version 2.9.18-1 hotfix | October.17.2022 - Fixed an issue where “mainRenderableMesh is null” message was displayed in the console when UModelerize tool is used.
The improvement of the Prefab workflow in UModeler 2.9.18 - https://tripolygon.notion.site/The-Improvement-of-the-Prefab-workflow-in-UModeler-2-9-18-7b654e55da934db190396e3e9c21aeab