I thought you might be interested in looking at BTR-70 Add working viewports, "Right Click" focus view port, "ScrollWheel" cycle available viewports/gunner/commander optics similar to Enlisted/RO2.
https://forums.bohemia.net/forums/topic/239603-btr-70-add-working-viewports-right-click-focus-view-port-scrollwheel-cycle-available-viewportsgunnercommander-optics-similar-to-enlistedro2/?do=findComment&comment=3464148
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