So, I had this problem recently, I came across this thread and none of the solutions here solved it. In case anyone else needs other solutions: the cause of the hole in my mesh was the opacity mask in my material. Here’s all the ways Google AI lists that a material can lead to holes such as these, this is what led me to solve my hole problem:
-
Masked materials, which allow for transparency based on a mask texture, can reveal holes if the mask doesn’t properly cover the underlying mesh or if there are issues with the material’s blending modes.
-
Displacement maps can cause holes if the normals aren’t properly smoothed or if the displacement values are too extreme, particularly when using tessellation.
-
Nanite can also sometimes exhibit issues with holes, especially with high-poly meshes or at certain distances. Lumen, Unreal Engine’s real-time global illumination system, can also reveal mesh problems with its debugging views.
Hope this helps others!