Armory3d is a completely open source game engine that is fully integrated into Blender. Below is my first attempt at stitching a terrain mesh, layered with satellite/flown imagery, making use of the excellent BlenderGIS plugin. You can then simply export the project to an HTML5 application which can run on any browser.
See below a second attempt with some slightly higher resolution sat data, with some improvements to control methods (detailed below). Use WASD keys & left mouse button for controlling camera, sun direction and shadows can also be adjusted with keys – T,Y,G,H,B,N:
Having discovered Orfeo ToolBox and it’s very handy QGIS plugin, I set about reviewing each of OTB’s supervised classifiers, to see which one performs the best with the goal of generating a perfect surface mask that I can use in my terrain project within RV4 engine.
PhotoScan (Agisoft Metashape) is a leading tool for photogrammetric processing which can produce great results even using your mobile phone to grab enough shots around your object. Meshroom is the same kind of tool but it’s open source.
My first attempts at using photogrammetry software focused on a coffee table. Photoscan did not pick out the thin table legs, but I suspect some better lighting and more camera shots lower down would have resolved that.