Dynmap Block Scan Forge 1.20.1 – Complete Setup and Optimization Guide

If you’re using Minecraft Forge 1.20.1 and seeking to enhance your server’s map capabilities, integrating Dynmap block scan is a game-changing feature. Dynmap, a powerful web-based map tool, can visually represent your Minecraft world in real time, and using block scans makes it even more precise by customizing how blocks are rendered. This guide dives deep into everything you need to know about configuring Dynmap block scan on Forge 1.20.1—from installation to troubleshooting and optimization.

What is Dynmap Block Scan in Forge 1.20.1?

Dynmap block scan is a feature that enables server administrators to scan all registered blocks from mods and vanilla Minecraft to create accurate render definitions. It analyzes textures, block states, and metadata to determine how each block should appear on the map. This is essential for modded servers using Forge 1.20.1, as default Dynmap may not correctly visualize non-vanilla blocks without this scan.

Prerequisites for Dynmap Block Scan on Forge 1.20.1

Before proceeding with the setup, ensure you have the following:

• Minecraft Forge 1.20.1 server installed and running.

• Dynmap Mod for Forge 1.20.1.

• A compatible block scan data generation tool (built into Dynmap or available as a standalone mod).

• Java 17 or higher, required by most modern Forge builds.

• Sufficient server resources: at least 4GB RAM, SSD recommended.

• Optional: Dynmap RenderData directory access for customizing rendered blocks.

How to Install Dynmap on Forge 1.20.1

1. Download Dynmap Forge Mod
   Head over to CurseForge and download the latest version of Dynmap for Forge 1.20.1.

2. Place Dynmap in Mods Folder
   Move the .jar file to your server’s mods/ directory.

3. Launch the Server
   Start the server to allow Dynmap to generate configuration files. A dynmap/ folder will be created in the root directory.

4. Access Dynmap Web Interface
   Open a browser and go to http://<server-ip>:8123. This URL gives you live access to the Dynmap view of your Minecraft world.

Enabling Block Scans for Mod Compatibility

To ensure modded blocks are correctly displayed:

1. Run Initial Block Scan
   Use the command:

   bash

   CopyEdit

   /dynmap fullrender world
/dynmap requestblockscan


   This command triggers Dynmap to scan all modded blocks in Forge 1.20.1 and generate .js render definitions.

2. Access Generated Files
   Navigate to:

   bash

   CopyEdit

   /dynmap/renderdata/


   You’ll find files like texture.txt, custom-blocks.txt, and block model .js files.

3. Customize as Needed
   Modify files in the renderdata folder to tweak how certain blocks are rendered. For instance:

   json

   CopyEdit

   {
"name": "mod:custom_ore",
"textures": ["mod:block/custom_ore"],
"transparent": false
}


Advanced Configuration for Block Scan

Edit the configuration.txt in the Dynmap folder for deeper control:

• Enable detailed scan logging:

  lua

  CopyEdit

  block-scan-log-enabled: true


• Set scan frequency (for dynamic updates):

  yaml

  CopyEdit

  block-scan-interval: 3600 # in seconds


• Whitelist/Blacklist Blocks:
  Define which blocks should or shouldn’t be scanned using:

  wasm

  CopyEdit

  block-scan-whitelist: ["minecraft:stone", "mod:glowing_block"]
block-scan-blacklist: ["mod:invisible_block"]


Optimizing Dynmap for Performance in Forge 1.20.1

To avoid lag and crashes:

• Use Flat Map for Large Worlds
  Flat maps reduce rendering complexity.

• Render in Chunks, Not Full World
  Use:

  bash

  CopyEdit

  /dynmap radiusrender world 0 0 100


  to limit rendering area.

• Adjust update rates:
  In configuration.txt:

  sql

  CopyEdit

  updates-per-second: 5


• Allocate More RAM
  For modded servers, allocate 6GB+ RAM to ensure Dynmap doesn’t bottleneck.

Common Issues and Fixes

Useful Dynmap Commands in Forge

• Start Full Render

  bash

  CopyEdit

  /dynmap fullrender world


• Trigger Block Scan

  bash

  CopyEdit

  /dynmap requestblockscan


• Reload Configuration

  bash

  CopyEdit

  /dynmap reload


• Check Render Progress

  bash

  CopyEdit

  /dynmap pause fullrender
/dynmap cancel fullrender


Best Practices for Using Dynmap with Forge 1.20.1

• Regularly Backup RenderData
  This ensures you don’t lose custom settings after updates.

• Update Dynmap Frequently
  Stay compatible with new Forge and mod releases.

• Integrate with Permissions Plugins
  Hide certain map layers or limit access using plugins like LuckPerms.

• Enable HTTPS for Web UI
  Secure your map with SSL, especially on public servers.

Conclusion

Implementing Dynmap block scan with Forge 1.20.1 is a crucial step for any serious Minecraft server admin seeking to deliver a visually accurate and high-performing web map. From installation to optimization, every step plays a vital role in achieving seamless compatibility with both vanilla and modded content.

If you’re running a custom modpack or aiming to showcase a massive multiplayer world, following these strategies ensures the map looks stunning and runs efficiently.