# Difference between revisions of "Math and algorithms"

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− | + | ; [[Compute eye space from window space]]: Algorithm and shader code for taking window space positions and computing eye space positions from them. | |

− | Required from the application by OpenGL for lighting calculations. | + | ; [[Calculating a Surface Normal]] : Required from the application by OpenGL for lighting calculations. |

− | + | ; [[ID-Buffer]] : A way to get the selection of the objects. | |

− | + | ; [[Trackball]] : Object rotation via a virtual trackball. |

## Latest revision as of 19:48, 24 February 2012

- Compute eye space from window space
- Algorithm and shader code for taking window space positions and computing eye space positions from them.

- Calculating a Surface Normal
- Required from the application by OpenGL for lighting calculations.

- ID-Buffer
- A way to get the selection of the objects.

- Trackball
- Object rotation via a virtual trackball.