Hi,
High level 3D engines are certainly something to consider as well, and I have evaluated a couple of them. Overall my impression was that those are generally massive pieces of software with lots of new dependencies, that are generally not built for being embedded in existing applications. (e.g. Godot, O3DE) I would be happy to hear any recommendations for higher level 3D engines that would be easy to embed!
Not necessarily a recommendation, but there's also Ogre3D (https://www.ogre3d.org/). In a project in a previous life (~15 years ago) we used it for flight preview. If I remember well, there was no terrain tile loader shipped with the engine, but we plugged one. We didn't have lots of objects, a few OBJs, so not sure how that would behave with big models. At the time we used it through a GTK integration, but there's apparently a Qt one: https://ogrecave.github.io/ogre/api/latest/class_ogre_bites_1_1_application_context_qt.html
Even -- http://www.spatialys.com My software is free, but my time generally not.
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