From SRB2 Wiki
Jump to: navigation, search
Test.png This article or section is incomplete. It doesn't have all of the necessary core information on this topic. Please help the SRB2 Wiki by finishing this article.
Warning icon.png This article or section is badly written and in need of a rewrite. You can help the SRB2 Wiki by fixing this article to meet with the standards described by the Manual of Style.
SB2CB featuring slopes.

SRB2 Community Build, abbreviated as SRB2CB, is a source code modification for SRB2 made by Kalaron. Its goal is to provide an alternative SRB2 engine for both players and modders alike. Its current features include functional slopes, PNG support (full color graphics), bots and extensive improvements to OpenGL rendering, among others. SRB2CB is OpenGL-based, therefore most new features have been designed for or can only be used in OpenGL. The project was started before the release of SRB2 2.0.


Current release information

Game engine features

OpenGL rendering

Main article: OpenGL

OpenGL rendering has been extensively improved and new features have been added for it. Since many of these features only work in OpenGL, Software rendering is unsupported. The game automatically launches in OpenGL, but Software rendering can still be enabled by launching the SRB2CB with the -software command line parameter.

Revamped OpenGL renderer:

  • OpenGL mode is capable of displaying nearly all level effects with little to no visual errors.
  • Render optimizations: you can look in all directions with no disappearing objects and the framerate got a 300% boost compared to SRB2's default OpenGL renderer.
  • Much richer colormap effects
  • Coronas.
  • Sprite shadows that stay in one direction (enabled using shadows 1 in the console).

OpenGL tips:

  • Turning fog mode on is recommended.
  • Fog density of at least 64 is also recommended (console gr_fogdensity 64).
  • The game automatically starts in OpenGL mode.
  • If the game gives an error when you start it up in windowed mode, try running it in full screen, or try changing SRB2CB's resolution in your config.cfg file or autoexec.cfg file.

Note about Windows 8 and 8.1:

  • A workaround is required in order for the OpenGL renderer to function correctly on Windows 8 and 8.1.
  • You must enable the Compatibility Layer for Windows 7 in order to prevent SRB2 from crashing when the OpenGL renderer is used.
  • Inserting "set __COMPAT_LAYER=WIN7RTM" in a batch script that launches SRB2 will handle this for you, and is recommended, but right-clicking on srb2win.exe and setting it manually also works.

Motion blur

It works with speed sneakers, hitting a red spring, or when falling down at a fast speed. OpenGL only. It can turned on or off via Console.


SRB2CB is capable of rendering PolyObject flats. They are rendered by default. However, mappers can configure a PolyObject's First Line to not render the top and/or bottom of the PolyObject if they wish. If the Bouncy Wall flag is checked on the first line, the PolyObject's bottom will not be rendered. If the Transfer Line flag is checked, the PolyObject's top will not be rendered.


Main article: SRB2CB/Slope

Slope are a key feature unique to SRB2CB. SRB2CB's slopes have collision and physics, on the other hand, they are properly rendering only in OpenGL.

MD2s models

Custom character MD2s and 'on the fly' MD2s are also supported. It's possible to use multiple player MD2s at a time.

As of SRB2CB v1.1, MD2 models can cast shadows, but this feature is still incomplete.


Bots are computer-controlled players that have been programmed to play Co-op and Match, but don't support Race, CTF and Tag. Bots were first introduced in SRB2JTE, but their artificial intelligence has been vastly improved for SRB2CB.

In SRB2CB, they use their abilities in Coop mode and are just a bit smarter in Match mode, they are also stable and are a lot less likely to crash the game. However, Knuckles bots can't climb up walls.

Single Player and Coop

  • Not fully working on Single Player. Forcing the game to add them (see SRB2CB/Console) will make the game stop recording data.
  • They follow the player.
  • They can be helpful. For example, Tails bot can be useful to fly the player over obstacles, just like in S3&K.
  • They can collect rings and destroy enemies. They don't go for monitors, but they still can break them.


  • General: collect rings and break monitors, but they can't use weapons or emeralds (unless a Recycler Monitor is broken).
  • Match and Team Match: they fight the player and each other, even in team match.
  • CTF: they can't join the game by their own unless server or game admin enforce it. The team system is not working properly.
  • Race: they behave like in Co-op, therefore, no actual race.
  • Tag and Hide & Seek: They can't join the game by their own unless server or game admin enforce it. Once joined, they behave like in Match. Tagged bots still try to shoot each other.

New colors

In SRB2CB, 6 new colors have been added, raising the total of colors in SRB2 to 21. Furthermore, the ranges of colors Silver and White use have been altered slightly.


Editing features

Thing types

2D Teleports

For dynamic 2D mode, there are some special objects that allow mappers to more easily align the player to the 2D track!

These are triggered when a player enters a dynamic 2D sector, so these objects must be placed in an "Enable 2D mode" sector to work. Just place these objects to where you want the player to be. These objects automatically teleport the player and do not effect the player's speed.

  • Thing type 780 - Aligns only the player's X axis
  • Thing type 781 - Aligns only the player's Y axis
  • Thing type 782 - Aligns only the player's Z axis
  • Thing type 783 - Aligns the player's X and Y axis
  • Thing type 784 - Aligns the player's X and Y and Z axis
  • Thing type 785 - Aligns the player's Z and X axis
  • Thing type 786 - Aligns the player's Z and Y axis

Linedef types

Sector types


Main article: SRB2CB/Actions

SRB2CB features 9 new actions.


Main article: SRB2CB/Console


  • TX_START support and PNG support while using TX_START.
  • Ringcolor console option to turn on/off colored rings.
Personal tools