NWN1 Tileset Tutorial

 After a long struggle to make my own tileset, I gathered some useful informations, I'm sharing here. This isn't a modeling tutorial. Those are dependant on 3D programs you use (Blender, Gmax, etc.) and import/export plugins. It's about the next step -  bringing your already created tile interior models into the game. Some informations here might be useful in merging tilesets together. I'll try to explain when something doesn't work, and why. I'll not cover all,  just the basics needed to make the tileset work.