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Understanding what maps are (helpful for custom maps)

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Introduction

Disclaimer
Before you advance, this guide will not show you how to fully make a custom map.
This guide will give you an insight of the concept of a map to the game and present you a bunch of tools/resources you could benefit from.

What are the maps?

You might think "Yeah, I know what maps are, they are the worlds Homer can walk, drive & kick people in". - Well yes but no.
Technically, maps are a bunch of region files that the game is told (by a Dyna Load Data String) to load or unload, joined by a terra file which contains a bunch of locators to load/unload regions when triggered.

Terra files

What are terra files?

They are the files that contain most of the data that belongs to a map, which include:

Region files

What are region files?

Shortly, they are the files that contain the geometry and collisions of your map & more, here is a list of what you should expect:
  • Locator Type 3 chunks - used for player cars, player character start, npc waypoints, parked cars, bonus cars
  • Locator Type 9 chunks - also known as Action Event Locators, they are used for certain things such as collectible placements (checkpoints, wrenches, cards), phonebooths, skin shops, teleporters and animation players.
  • Locator Type 12 chunks - used for static cameras
  • Locator Type 14 chunks - used to place coins
  • Intersects - also known as ground collisions, they act as a ground for cars, characters & usually snaps the traffic cars onto it.
  • Static Entities - also known as geometry, they contain meshes without an offset data.
  • Static Phys - also known as collisions, they are geometry that the game renders physically and not visibly. Cars, characters and sometimes props can touch them. Such chunks come in 4 states - capsules, cubes, cylinders and spheres.
  • Dynamic Phys - also known as props.

Useful tools

Jeff's Map Creator

The greatest tool for such work would be the map creator, which is specifically designed for this.
It has unity-like GUI & controls to make the job easier for anybody (familiar or not with unity).
Download here
Check out more information about it here

Blender

Most of the tools used for map editing are add-ons for Blender.
I recommend using version 2.90 of Blender, but any higher version should work.

Other

These tools are also useful if you want to properly edit maps

Ending

Requirements

All of this being said, here are a bunch of things you might be required to know before you proceed to try and make your own map:
  • Have knowledge on using Blender
  • Have knowledge on using the Pure3D Editor
  • Have patience

Notes

I am hoping you learnt a bunch of new things about maps from this tutorial and that you found it useful. Have a good day!
Also check out the (hopefully) soon-to-come model builder tutorial on how to make a map. This won't really be useful as the tool isn't released yet, but it can give you a bunch of ideas on how a map works.
Huge thanks to @Lucas Cardellini , @TheButterApple & @Weasel on a Stick for their tools that allow us to manage these maps with such ease!
Finally, a tutorial for new maps. Hoping to see some new maps incoming.
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and you're gonna like them