promotional bannermobile promotional banner

Debug Block Collision Overlay Reloaded

A client-side mod that adds a new F3 debug overlay showing you exact block collisions, for 1.12.2.
A screenshot of a few different vanilla blocks using the radius mode of the overlay.

A screenshot of a few different vanilla blocks using the radius mode of the overlay.

A screenshot of the mod's entry in the mod list.

A screenshot of the mod's entry in the mod list.

Description

Debug Block Collision Overlay Reloaded

A client-side mod that adds a new F3 debug overlay showing you exact block collisions.

About

Original Mod's Github - Original Mod's Curseforge

Modrinth Page

Features

  • Toggleable overlay, default keybind F3 + O.
  • Multiple overlay modes, default keybind F3 + I.
  • Config file which allows you to set the overlay mode, the level of chat feedback and line rendering settings.
  • In-game configuration through Forge that is dynamicly reloaded.
  • Has been tested with Cleanroom Loader (0.4.2-alpha) and Celeritas.

Usage

The main way to interact with this mods is by using the F3 + KEY keybinds which by default are F3 + O to toggle the overlay on/off and F3 + I to change the overlay mode.

There is also a config file which is dynamicly reloaded and can be edited in game or on the main menu.

Why

Well working on ProjectE-Charms I had to create some custom collision for a block but was having trouble visualizing the boxes so I looked on curseforge for mod that would help me do that, I ended up on Debug Block Collision's Curseforge so I downloaded it. After I had used it for a little bit on the Cleanroom Mod Loader I noticed a few main issues:

  • The keybind handling had broken debouce (actually a Cleanroom issue with modifier keys).
  • Toggling modes was clunky since there was only one keybind.
  • And the text and formatting could do with some improvement.

All of this inspired me to improve this mod by adding a second keybind, improving Cleanroom compatibility and rewriting the lang file; so I did.

Modpacks

You don't need to ask permission or anything to use this in your modpack.

Issues

If you notice an issue and want to make me aware please report them on the project's Github issues tab.

The Debug Block Collision Overlay Reloaded Team

profile avatar
  • 4
    Projects
  • 1.0K
    Downloads

More from barnabeepickle

  • Bad Grass, No Spread project image

    Bad Grass, No Spread

    • 19
    • Mods

    A Minecraft mod that stops grass and mycelium from spreading to dirt blocks with coarse dirt underneath them.

    • 19
    • March 23, 2026
    • Mods
  • ProjectE Charms project image

    ProjectE Charms

    • 898
    • Mods

    An experimental ProjectE content addon for Minecraft 1.12.2

    • 898
    • February 10, 2026
    • Mods
    • +2
  • Make Panorama project image

    Make Panorama

    • 109
    • Mods

    A simple Minecraft mod that adds the abilty to take high fidelity panorama screenshots to Minecraft 1.12.2

    • 109
    • January 30, 2026
    • Mods
  • Bad Grass, No Spread project image

    Bad Grass, No Spread

    • 19
    • Mods

    A Minecraft mod that stops grass and mycelium from spreading to dirt blocks with coarse dirt underneath them.

    • 19
    • March 23, 2026
    • Mods
  • ProjectE Charms project image

    ProjectE Charms

    • 898
    • Mods

    An experimental ProjectE content addon for Minecraft 1.12.2

    • 898
    • February 10, 2026
    • Mods
    • +2
  • Make Panorama project image

    Make Panorama

    • 109
    • Mods

    A simple Minecraft mod that adds the abilty to take high fidelity panorama screenshots to Minecraft 1.12.2

    • 109
    • January 30, 2026
    • Mods