Hello, Developers so I was making 3D text for my game and I ran into a problem when I imported the mesh it had a Scratchy appearance I will list the image below.
This is the mesh in blender
can you give more images? this could be uv map problem, too much polygons, roblox can just mess up your textures, try to separate these letters 
Subdivision Surface is causing this problem, since you are using mesh importer plugin, it reduces your polygon count so it looks like that, disable Subdivision Surface modifier or reduce your polygon count to 10k
I have over 10K triangles so how could I fix it
the simplest solution is to copy faces from your letters and extrude them again, don’t use Subdivision Surface modifier, just bevel your facets