Quality-gated workflow
Why PhotoTo3D builds in passes instead of attempting a one-shot mesh.
Assessment and contract
Every build starts by classifying the subject and the complexity of the reference. The quality contract records the minimum acceptable silhouette, proportion, material separation and identity details.
This is the fail-fast gate. A compound object cannot proceed with a shallow one-part spec simply because the JSON is syntactically valid.
Locked passes
The pass order is blockout, structure, form refinement, materials, surface, lighting, interaction and optimization. A pass changes only the concerns it owns.
Each pass should be reviewed against a real render. If a critical identity feature misses its threshold, refine the spec or code before moving forward.
The review decision
A review chooses one action: continue, refine the spec, refine the code, request another image or stop. Global similarity cannot hide one recognizably wrong feature.