The best way to reduce a 3D model with normal maps is combining texture compression (e.g., Basis Universal, ASTC) that preserves detail with mesh simplification aligned to the normal map’s surface information—this balances smaller file sizes with retaining the model’s visual depth.
- Texture compression maintains normal map quality (critical for surface detail) since normal maps add depth without extra geometry—so you don’t lose texture-based detail even as the mesh shrinks. - For tools like Blender or Substance Painter, start with mild compression (50-70% quality) to test detail retention before simplifying the mesh further—this avoids over-reducing and keeps the model sharp.