Tundra Setup
Getting Unity
If you don't have Unity already installed, go and install Unity Hub. You might have to create a Unity account and choose the personal license.
After that you will have to install Unity 2019.4.40f1. You don't need any dev tools, platform support or documentation so feel free to uncheck all the boxes.
Also, it might be useful to learn the Unity essentials if you have never used Unity.
Getting Tundra
At this point in time, Tundra isn't publicly available. Contact PITR via the Discord server you should already be in.
After setting up your GitLab account and installing git, create a new 3D Unity project with the correct version of Unity.
Next, download the Tundra Installer and unzip it in the root of your new project.
Note: If you're viewing this during the private beta, the download link is likely to be broken. In that case, you must obtain the latest installer from the tundra group on Discord.
Setup
Close Unity and start the install_prereq.bat
if you haven't already.
Make sure you already have the Agony version of the game installed, before running the installer.
Follow the steps from the script, and then launch the installer.
Creating a new map
Using Quick New Map allows you to mostly skip the Map Setup, though you still have to fill out your map details!