In Minecraft, having to go back and fix blocks that you accidentally placed or destroyed is time-consuming and annoying. BuildRegion is a user interface enhancement mod, designed to help you avoid these little accidents.
BuildRegion can also help you plan structures, giving you a dynamic blueprint right there in the world.
BuildRegion is not an auto-build tool. It will only prevent you from misclicking; it will not click for you. It's all client-side, meaning you can use this on multi-player without the server having to run a special plugin.
Older versions are also available on the downloads page.
Without BuildRegion, this ceiling-in-progress would have an unwanted block hanging down! New for version 2.0, cuboid regions and a GUI! Mod spotlight video of BuildRegion v1.0.3, courtesy of PerpetualJordan:
Mod review video of BuildRegion v1.0.3, courtesy of iPodmail: Another shot of a region selection: BuildRegion can be useful for moderating a server too: BuildRegion in real life?
First of all, make sure that LibShapeDraw is installed as it is a base requirement. You'll also need ModLoader or Forge; BuildRegion is compatible with either.
Next, download the zip and do one of the following, whichever you prefer:
Use a launcher utility to add the zip (recommended). There are many launchers out there, e.g. Magic Launcher.
Move the zip file to the mods subdirectory. This subdirectory can be found in your Minecraft directory.
Manually patch the contents of the zip file into your minecraft.jar. Old-school modding still works. Be sure to remove the META-INF folder.
BuildRegion does not modify any vanilla classes directly and therefore should be compatible with virtually every mod that works with ModLoader or Forge. If you find an incompatible mod please post here or open an issue on github and we'll try to sort it out.
To get started, hold control on your keyboard and right-click your mouse. This will make a grid appear in front of you. As long as the grid is active, you can only build inside that region. Use control-left-click to remove the build region.
You can easily redefine the region: just move around or face a different direction, then control-right-click again. You can also move the region around using [, ], and the arrow keys.
Press B to change how the build region works:
Blue (default): you can only place or destroy blocks inside the grid.
Red: you can only place or destroy blocks outside the grid.
Green and white: the grid is for display only; it won't affect block placement.
Finally, press shift-B or control-middle-click to open up a GUI window to help you define the region. Most of the things that you can do in the GUI are already covered by a keyboard or mouse shortcut, listed above. The GUI is intended as an alternate way to set up your region -- use whichever method you prefer! Even if the GUI is open, you can still use keyboard/mouse shortcuts, and you can adjust the camera by moving the mouse while holding right-click.
Note: if you're using a Mac, use command (⌘) instead of control.
BuildRegion is open source! Visit the official project page at github.com/bencvt/BuildRegion. In addition to the source code, the project documentation also includes the change log and a list of planned features.