Transparency Handling in the Graphics Engine

[patrick]

Introduction

Transparency in OpenGL is handled very differentlly from the rest of the drawing process. Transparent (blended) objects need to be drawn manually from back to front in order to be displayed correctly (because the depth buffer is disabled for transparent stuff).

Goal

In order to support transparent objects in Orxonox, the graphics engine needs to be able to identify transparent objects. All transparent objects must then be handled in a seperate list ordered from back to front (relative to the current camera position). If an object itelf has more than one transparent face, the faces need to be ordered from back to front as well. But this is the problem of the objects itself and doesn't need to be looked at in this problem.

[bknecht]

Milestone Features deleted