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MV3D is a 3D rendering plugin for RPG Maker MV.
It requires your MV to be version 1.6.1 or newer.
MZ3D is a version of MV3D adapted for the later RPG Maker, RPG Maker MZ.
In there you will have a demo version of the plugins, with some functions missing, and a demo project to see it at work.
Fot the full product, you can buy the plugin on the respective itch.io, or become a patron on Patreon.
To add MV3D/MZ3D to a new or existing project, download the plugin zip file and extract the files into your project directory.
The folders are already set to put the needed files on the proper folder. Then, load mv3d (mz3d in MZ) as a plugin on the plugin manager.
Now when you run your game, the map should be rendered in 3D.
There is, of course, a need for some customization. For instructions on those, please read the documentation.
There is a second more detailed, wikia-like version being worked on.