Common mistakes when working with collision or normal maps for 3D models include misaligning UV coordinates, over-emphasizing surface details, and neglecting low-poly mesh topology.
Misaligned UVs make the map mismatch the model’s shape, causing visual glitches or incorrect collision. Over-exaggerated details (like overly deep grooves) look unnatural or break rendering. Neglecting topology (e.g., uneven polygons) leads to distorted normals or unreliable collision detection.
If you’re starting out, try simple low-poly meshes first and preview maps in your target engine early—this helps catch alignment or detail issues before finalizing the model.