vim-godot VS U3D

You can run a godot scene without the editor open. I use an editor plugin to do that. However, you'd have to create a scene with a node or setup an autoload in the editor. But then you'd have a code entry point. Godot would get you physics and scenes, and in my limited experience Godot seems capable of being very code driven. But there's tons of features that I don't know how you'd use without the editor (animations).

I followed the instructions on both the vim-godot GitHub and this article, yet I can't get any files to open in Neovim. I can get Neovim to execute scenes in Godot, so clearly they can communicate. Was there any more I needed to do beyond these simple steps outlined for the plugin?

I think if I can't figure a way to stop Godot from opening the script file in its editor, I'll go with this: https://github.com/habamax/vim-godot

Are you referring to this plugin? https://github.com/habamax/vim-godot

On a similar note, released games with open sourced code: https://osgameclones.com/?tag=official

https://torque3d.org was used on Airship Dragoon, Marble Blast Gold, Penny Arcade Adventures, Legions: Overdrive and descends from the original Tribes engine.

Hellbreaker, Bit Champs with https://u3d.io

And plenty of successful games with Ogre, including Torchlight: https://www.ogre3d.org/showcase

good engines for C++ that meet your requirements https://github.com/u3d-community/U3D https://github.com/rbfx/rbfx i highly recommend taking a look at rbfx, U3D doesn't have all the fancy features that rbfx has but deep down they are the same engine almost. They are forks of Urho3D, a mature engine that has existed from the year of 2011/2010.