There are tools to correct externally a mismatch (e.g. So it is recommended to derive the TRI from the NIF. The TRI and the NIF must have the same vertex number and numbering. Below is a procedure I found worked (for SSE in 2020) for creating the basic TRI file for a mod-derived NIF file, using nothing more than OutfitStudio and the Creation Kit (not the CharGen, nor the Races, just the base TRI file). Without the TRI files, the game can load the meshes fine, but they will be static. i), and when characters speak or emote (i.e. i), deforming said beard during the generation of the player character (i.e. beard.nif) designed for human jaws to fit elven jaws (i.e. In Skyrim Special Edition, TRI files are used to indicate to the game how to deform a mesh, housed in a NIF file.
