Recent reviews and discussions made me think about the camera controls again and I made some improvements. The camera in orbital view no longer automatically zooms out. Instead, when colliding with terrain, it will stop orbiting and start turning around. This gives a more pleasant and controlled experience.
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[*] refined orbital camera controls
[*] fixed the bug of zoom to mouse function with inverted mouse zoom
[*] Deep mine I research is now unlocked by default.
[*] fixed the save thumbnail bug.
[*] copy building with MMB will copy the building along with recipe and upgrades
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