Use model screenshots, a reference image, material zones, and a saved view to define which visual parameters should remain fixed across later architectural generations.

The actual workflow — connected nodes you can run to preview each step.
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Carry the approved form, viewpoint, and material zoning into later images without restating every condition.

Define what must remain stable before exploring lighting, atmosphere, or another permitted variable.

Give coordinated view generation a clear reference for shared geometry and material decisions.
A geometry lock needs clearly readable form; a camera lock needs an unambiguous viewpoint; and a material lock needs distinct zones. Weak source information cannot become precise simply by labeling it fixed.
Separate stability from identity. For example, keeping a material zone fixed does not necessarily require every reflection or lighting response to remain visually identical.
Record exceptions and acceptable variation. A useful profile defines both the protected design intent and the areas where later workflows may still explore.
Create a reusable lock profile for the geometry, camera, and material decisions that carry the design intent.