For exporting 3D models as Unity assets, the best manual retopology methods focus on clean quads, deformation-aligned edge flow, and performance-matched polycount—critical for compatibility, animation, and real-time efficiency.
Clean quads integrate seamlessly with Unity’s shaders and subdivision, avoiding rendering glitches. Edge flow along joints (e.g., elbows, knees) prevents animation artifacts, vital for character models. Polycount should align with Unity’s platform needs—lower for mobile, higher for desktop—to keep assets efficient, whether for environment props (polycount matters) or characters (deformation does).
If you’re new, start with simple props (like a cup) to practice core topology rules (quads, edge direction) before tools like Blender’s RetopoFlow—mastering basics beats tool reliance for Unity-ready assets.