I was working on a simple room generator blueprinte, when I noticed that some block of walls had a wierd gap between each piece. This gaps only apears in the walls that I rotated (90°, 180° and 270°). In this project I am using UE 4.16.2, so I tried to reproduce this bug in UE 4.18.2 using the assets of start content and the bug was reproduced. To reproduce this bug follow this steps:
1 -In a new blueprint project template, create a Blueprint base on a Actor class.
2 - Add a Instanced Mesh Component
3 - set the wall_400x400 static mesh in the Instanced Mesh Component
4 - In the Construction Script tab set up the nodes like the figure
5 - when you set the BP to create the mesh along the x axis, everything is fine, no gaps,
6 - when you set the BP to create the mesh along the y axis and rotate each one 90° the Instanced Mesh, small gaps appears between each wall piece.
This bug is easy to reproduceand I hope this report be usefull. In the meanwhile I will figure a workaround this bug ! Thank you !