Dynamic Hidden Surface Removal
In previous versions of S2 ENGINE and in many commercial engine still today, developers use hybrid techniques which include, in most cases, BSP and portals, to eliminate not visible areas, and thus reduce unnecessary calculations.
This fact severely restricts the freedom of artists which must follow some rules to make the scene compatible with the structure "room, portal, room". It also slows down their work forcing them putting into the scene "fictitious" elements such as portals, or waiting the "building" of the BSP file before testing the scene.
In S2 ENGINE HD all these limitations do not exist any more!
The artist, now, can do whatever he wants without having to worry about portals, sectors, rooms, and more. S2 ENGINE HD will take care, in a transparent and dynamic manner, to eliminate from the rendering scene not visible elements, using the technique of occlusion query .