When creating LOD (Level of Detail) normal maps for 3D models, focus on four key tips: preserve edge detail in lower LODs, keep UVs consistent across levels, bake from the highest LOD, and preview early in your target engine to avoid artifacts.
Edge detail (like creases or hard surfaces) maintains lower LOD believability—even as geometry simplifies, these details keep the model’s shape recognizable.
Consistent UV layouts prevent distortion—if UVs shift between LODs, the same normal map will stretch or mismatch, ruining the texture’s depth.
Bake from highest to lower LODs—this transfers detail accurately, so lower levels retain the normal map’s realism without extra work.
Preview LODs in your target engine early—adjust normal map intensity or edge preservation before finalizing to ensure every level looks smooth and consistent.