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About Free Software and the GPL

GNU logo

When one hears about "free software", the first thing that comes to mind might be "no cost". While this is true in most cases, the term "free software" as used by the Free Software Foundation (originators of the GNU Project and creators of the GNU General Public License) is intended to mean "free as in freedom" rather than the "no cost" sense (which is usually referred to as "free as in free beer"). Free software in this sense is software which you are free to use, copy, modify, redistribute, with no limit. Contrast this with the licensing of most commercial software packages, where you are allowed to load the software on a single computer, are allowed to make no copies, and never see the source code. Free software allows incredible freedom to the end user. Since the source code is universally available, there are also many more chances for bugs to be caught and fixed.

When a program is licensed under the GNU General Public License (the GPL):

  • you have the right to use the program for any purpose;
  • you have the right to modify the program, and have access to the source codes;
  • you have the right to copy and distribute the program;
  • you have the right to improve the program, and release your own versions.

In return for these rights, you have some responsibilities if you distribute a GPL'd program, responsibilities that are designed to protect your freedoms and the freedoms of others:

  • You must provide a copy of the GPL with the program, so that recipienta are aware of their rights under the license.
  • You must include the source code or make the source code freely available.
  • If you modify the code and distribute the modified version, you must license your modifications under the GPL and make the source code of your changes available. (You may not use GPL'd code as part of a proprietary program.)
  • You may not restrict the licensing of the program beyond the terms of the GPL. (You may not turn a GPL'd program into a proprietary product.)

For more on the GPL, check the GNU Project Web site.

Note: The GPL only applies to the blender application and not the artwork you create with it; for more info see: Blender License

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This is the old manual!
For the current 2.7x manual see

User Manual

World and Ambient Effects


World Background

Ambient Effects

Stars (2.69)

Game Engine


Introduction to the Game Engine
Game Logic Screen Layout


Logic Properties and States
The Logic Editor


Introduction to Sensors
Sensor Editing
Common Options
-Actuator Sensor
-Always Sensor
-Collision Sensor
-Delay Sensor
-Joystick Sensor
-Keyboard Sensor
-Message Sensor
-Mouse Sensor
-Near Sensor
-Property Sensor
-Radar Sensor
-Random Sensor
-Ray Sensor
-Touch Sensor


Controller Editing
-AND Controller
-OR Controller
-NAND Controller
-NOR Controller
-XOR Controller
-XNOR Controller
-Expression Controller
-Python Controller


Actuator Editing
Common Options
-2D Filters Actuator
-Action Actuator
-Camera Actuator
-Constraint Actuator
-Edit Object Actuator
-Game Actuator
-Message Actuator
-Motion Actuator
-Parent Actuator
-Property Actuator
-Random Actuator
-Scene Actuator
-Sound Actuator
-State Actuator
-Steering Actuator
-Visibility Actuator

Game Properties

Property Editing

Game States



Camera Editing
Stereo Camera
Dome Camera




Material Physics
No Collision Object
Static Object
Dynamic Object
Rigid Body Object
Soft Body Object
Vehicle Controller
Sensor Object
Occluder Object

Path Finding

Navigation Mesh Modifier

Game Performance

Framerate and Profile
Level of Detail

Python API

Bullet physics


Standalone Player
Licensing of Blender Game

Android Support

Android Game development