: http://marathon.bungie.org/story/Marathon4/Marathon4.html
: It's fake, but someone or a group of people could make a full 3D game engine.
: A full 3D Marathon engine would be interesting.
: The way I'm thinking about it is the game engine must be compatible with the
: original game maps.
: 5D space can work in full 3D with portal rendering.
: Both Unreal engine 4 and Unity engine support portal rendering.
: Portal rendering for visibility determination and not the portals that
: teleport with multiple cameras.
: Portal rendering starts with the main camera finding portals with the view
: frustum in the sector the player is in and the portals have a reduced view
: frustum to find other portals.
: Each sector has a list of portals.
: The portals have a (AABB) axis aligned bounding box.
: The view frustum is an array of mathematical planes that intersect a axis
: aligned bounding box or the planes can intersect a line with the frustum
: planes clipping a portal polygon to activate portal sectors.
: The planes normal positive side point inside the view frustum.
: Three points make a mathematical plane, two vertices from the portal and the
: camera and all points are in world space.
: The portal vertices go around the front of it in a clockwise order.
: If two visible sectors overlap, the portal view frustums can clip the
: sectors.
: Clipping windows can be portals.
: I'm searching for more information on portal rendering to improve my Unity
: Marathon project.
GZDoom can now support 5D spaces with portals, too.
