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Question about map loading mechanism

BMM Archive · July 15, 2026

Preserved forum archive. This topic stores the original first post and locally mirrored RPG Maker Web attachments when available. It is posted by the BMMPlay archive account, not by the original creator.

Original Source

  • Original title: Question about map loading mechanism
  • Original author: henryandjay
  • Original date: June 17, 2019
  • Source thread: https://forums.rpgmakerweb.com/threads/question-about-map-loading-mechanism.110094/
  • Source forum path: Game Development Engines > Legacy Engine Support > RPG Maker MV Support

Summary

Greetings. I am new at RMMV, and aims to develop a (simple) rougelike game. To achieve this, first I have to understand the map loading mechanism... (since rougelike style indicates highly random map) I know how to program with javascript, and had read this post about understanding the map structure. Also, I know how to store map data into game variables and restore it when in need.

Archived First Post

Greetings.
I am new at RMMV, and aims to develop a (simple) rougelike game. To achieve this, first I have to understand the map loading mechanism... (since rougelike style indicates highly random map)

I know how to program with javascript, and had read this post about understanding the map structure.
https://forums.rpgmakerweb.com/index.php?threads/understanding-map-data.83140/

Also, I know how to store map data into game variables and restore it when in need.
But my problem is, I don't know how the map loading mechanism works. For example, I have a map looks like this:
Protected download

And I want the map turn into something like this (just for exercise) after triggered some events:
Protected download

Actually, I can already achieve that by modifying $dataMap.data by running some javascript codes. However, the map changes back immediately after I opened & closed menu.

So my question is, how can I replace a map data when entering area, also keep it the same when I open/close menu, or after other possible actions? (map data can be generated by algorithm)

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