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What is the difference between Unity-2D and Unity-3D? Would unity-2D be supported (updates, features) in the future version of ubuntu?

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Technical differences.

Unity

  • Written in C++ as a compiz plugin and uses nux for OpenGL support.
  • Requires hardware acceleration (Compositing). (Hardware requirements)
  • Is shipped as the default environment in 11.04
  • Also does window management via compiz itself.

Unity 2D

  • Written in C++ with Qt
  • Works on systems without hardware acceleration, like ARM-based platforms, as a result it is incapable of advanced 3D effects.
  • Shipped as the fallback method in 11.10. Is not shipped by default in 11.04, available as a separate package that the user has to install.
  • Needs a seperate window manager (like metacity) to do window management.
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Unity-2D is for use with computers that do not support 3D-accelerated graphics, such as some low-end netbooks. Unity-2D looks almost exactly the same as its 3D counterpart, albeit without a bit of the eye-candy.

As for updates, both should be updated around the same time - although I'll expect Unity-3D will have a bit more effort put into it just due to the fact it is the "mainstream" version of Unity.

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unity 2D started from net books and was new i used it on my net books unity 3D will be The default for 11.04 if 3D is supported there are added features for instance if you open a web browser and maximize the bar will hide.

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