Zoom limits: cannot expose a single intuitive zoom slider because perceived zoom depends on both FOV and orbit radius

[Strizhko-aa]

Description

I need to limit user zoom and expose it as one intuitive slider (e.g., 0–100). In <model-viewer>, the perceived zoom changes through two different parameters at the same time:

• Field of view — field-of-view (with min-field-of-view / max-field-of-view)
• Camera orbit radius — camera-orbit (with min-camera-orbit / max-camera-orbit)

Because both affect the apparent scale, I can’t define a single min/max zoom range or a single slider mapping. If I clamp FOV, changing the orbit radius still changes perceived zoom; if I clamp radius, changing FOV still changes perceived zoom.

Ask: What is the recommended way to:

1. Constrain zoom to a single, predictable min/max range that users can’t exceed, and
2. Drive that range from one slider value (mapping to FOV and/or orbit radius as needed)?

If there is a known approach or example to combine these parameters for a single zoom control, please point me to it.

[AndreyZadachin]

I have the same problem, maybe there is some solution?