Yet more post processing.

Today me and Ross discussed ideas for new assets, we also recoloured the scene through post processing and added a visual effect with the ability to darken objects the further it was from the player, this give the impression that the horizon is silhouetting. In order for the skybox to not be affected we created a mask that stopped the darkening after a certain distance, far enough to cover the terrain but small enough to let the skybox do its job.