We arrive at the end of the treatment by the GPU. At this stage, the two main treatments have been carried out, namely the two pipelines. As a result, the end of the treatment will bring no radical change in terms of visual depiction and performance. Among these tests, note the “alpha test” which acts on the component alpha of the colour of the pixel, component which manages the transparency.

Then there is the “depth test”, whose purpose is to act on the superimposing of pixels; indeed if a pixel is placed in front of another, then the deep one will not need to be posted since it is covered.

From here, all the pixels having passed the three tests will be posted. There remain now two tests which will act on posting of course: the alpha mixture and the fog. This last one is the fog which does not allow to distinguish an object when far; this object will be posted when approached. The alpha mixture will deal with the transparency, through mixing the pixels.