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Pro idTech engine 1 voxel editor
While originally the games made with the idTech engine 1 (aka the "DooM Engine") did not have voxels in them, new limit-breaking source ports have added the ability to render .kvx voxel models into these games. Slab6 is currently the only well-known .kvx editor as it continues to pop up in DooM modding forums and tutorials. Even though it's not the most user-friendly editor, its support for .vox export enables the model to be edited in magicavoxel or voxels made in magicavoxel (which supports Slab6 (Slab) .vox export) to be converted to .kvx for use in-game.
Con Not very user friendly
If I asked most people to use this to draw something without reading anything about the program, a good percent would not be able to. with odd controls like 'Insert' to draw, 'L' to open, and no customization on these controls, its requires users to read how to use it. the help guide only gives you a basic understanding of how things work and requires you to search through files in order to fully understand how powerful this tool really is. If i were to rate this for how user friendly it is on a 1 -10 scale (with 1 being like binary switch panels, 3 being ms-dos, 5 being a minimal gui with a complex console command line for all functions, 8 being able to sit down and perform basic operations, and ten being no effort at all,) I would give this a 7(has a gui that is easier to navigate but even simple functions require a bit of reading).