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RTT - In the context of Ogre, Render To Texture, a technique where the rendered pixels are blitted to a texture, instead of to the screen.
The otherwise most common usage of the acronym is Real-Time Tactics, a sub-genre of strategy games sibling to -RTS (real-time strategy).
For the usage of this method in Ogre, have a look at the Intermediate Tutorial 7.
- MadMarx Tutorial 9 - Part 1
- Render to Texture in Wikipedia (Redirects to Framebuffer Object)