How to fix messy in environment 3D models?

To fix messy environment 3D models, organize assets (textures, objects, layers) and use 3D software cleanup tools (merge, delete duplicates, optimize geometry)—this resolves core issues like clutter, overlapping polygons, or scattered files. For scanned data, retopology simplifies complex geometry; for iterative work, group similar items into layers/collections to stay organized. After cleanup, save a backup and preview the model in a render or game engine—this ensures fixes align with your target use case (e.g., gaming, visualization).