Developer
Developer is a console variable in the Source engine that enables various levels of developer debugging options. This includes entity diagnostic information which will be printed to the console and also at the top of the screen.
Syntax: developer <value>
Valid values are:
- 0: turn debugging mode off (default)
- 1: some debugging information
- 2: verbose debugging information
- 4: even more debugging information
Number one will enable developer messages to print to your console, number two will do the same, except now the messages will write to the top-right of your HUD. Number four would do the same what number one and two only now it will add some more on-screen info like where the clints crosshair is pointing (Shows the crosshair of all the players in multiplayer) and shows hitboxes and boundboxes (Only if there is an error with that object like collision and "Clint stuck on object...")
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Developer mode can also be enabled via the -dev or -developer command line switches.
See also
Other console commands and variables that a developer may find useful include:
If you are looking for information about being a developer for Valve games, you may instead find these pages useful: