Tips: Shiny Meshes
Often, if not always, when a bump or normal-mapped texture is made for vanilla Morrowind it shows up shiny in-game with OpenMW. The reasons for this, and how to fix it, are covered in great detail in the official OpenMW documentation.
Windows users can do a "Find In Files" search for "TextureEffect" in their mod folder, and Windows Explorer should search all your mesh files for any such reference. A very handy way to easily find them.
Linux or macOS users can do
grep --binary-files=text TextureEffect Mod_Folder (where
Mod_Folder is the path to your actual mod folder) from a terminal to get the same effect.
In many cases, you can simply not use the included meshes and everything will look as expected. But mods that alter not only the textures but also meshes cannot be used this way, and mesh edits are required.
Soon, I'd like to distribute patched meshes on this site, but until that day you are encouraged to try the methods described in the documentation when you find a mod that's shiny.