What Flux.2 Klein actually does to your massing model

Every rendering tool promises to respect your geometry. Few do. We tested a single mid-rise massing model exported from Rhino through Flux.2 Klein at five denoising strengths, holding prompt and seed constant, to establish where the model stops interpreting and starts inventing.

The setup

A nine-storey residential block with a deep colonnade at ground level and a regular fin rhythm above. The colonnade matters: it is the kind of feature that AI rendering tools routinely flatten into a painted-on shadow.

What held

Below 0.45 strength, the fin rhythm survived intact. Bay spacing stayed within a fin of the source model, and the colonnade read as real depth rather than a graphic.

What dissolved

Above 0.6, the model began adding storeys. Not dramatically, but a nine-storey block returned as ten in three of eight generations. For competition imagery this is disqualifying.

The working range

For presentation work where the geometry is fixed, 0.35 to 0.5 is the usable band. Higher settings belong to early concept work where the massing is still a suggestion.