What is the difference between sketch 3D model and photogrammetry 3D model?

Sketch 3D models are manually designed by artists using software (e.g., Blender), while photogrammetry 3D models are algorithmically generated from multiple photos of a physical object. Sketch models rely on human creativity for custom or imaginary designs (like game characters), whereas photogrammetry models excel at accurate, lifelike replicas of real things (like a monument) by merging photo data. Use sketch modeling for original ideas; for replicating real items, try user-friendly photogrammetry tools like Meshroom for simple, precise results.