Hey guys. The reason for the seam is because the sampler for the base texture will wrap rather than clamp at the boundary. This means you’ll get a small amount of the other edge of the texture, which will create seams if the texture’s sides aren’t tileable.
A way to avoid this is to use a material setting in the MTRL block to scale the UVs such that a single texture can be spread across multiple wall or floor tiles. The parameter name is DiffuseUVScale (which is referenced in the MRTL block via the hash of its name: 0x2d4e507e). Setting this to 0.5 will make it a 2-tile interval, 2.0 will make it a half-tile interval, etc. For an example of a resource that does this, see 01d0e75d:00000000:98cf7bf37a1cc76c – this wall pattern is called “Urbanity” in the catalog. There is a limitation on this though, the alignment of the wall texture is based on its lot position, i.e. if a texture spans multiple tiles, which part of the texture that is used for a particular tile is based on that tile’s lot position.
Hope that helps.
