Hi, I need someone to help me with a little problem that I've faced (with code snippet or with an advice how to make this). I have a door in the middle of the room, so all I want is, after opening this door (I use animation for that) I want to see in the doorway next level (and player must be able to see it only from one side of the door). I know that I can use an other view on entity, but how to show there a new level? And how to make player move to that level? BTW moving to the next level must be similar to portals in PORTAL, I mean they must be smooth, and player must be able to walk back as well (this is unpaid, but credit may be possible).

You can't switch between levels this way, because when loading a level, the current level will be closed and all entities within will be removed.
That's principle of levels in Acknex.

http://www.conitec.net/beta/alevel_load.htm

Thank you. I have an idea how to make it another way:
I'll make two rooms (in one level), each of rooms has a door, how can I move from one room into another an back via doors (smoothly so I could be even able to stop right in the middle of the doorway and turn around, move etc (as in portals in Portal game))? I know that I can use views to see the next room in the doorway. But I have no idea how to handle smooth moving between levels?

maybe add a passage common to the two levels, and do the level change when you are in the passage

You could create your levels normally, and than put all the wmb files into one big level. From there you make that level parts invisible/visible.

But I do not know how fast that will be.

Each of level is going to be a room, so I'll just put them into one level (all of the rooms). So I have an idea how to handle levels. But I have no idea how to make smooth movement between levels...

The developers of Half-Life accomplished this by putting an invisible marker in both levels that acted as common reference points between the two levels. They then made an exit area in both levels that looked identical between them, and put some "change level" triggers in that area (the triggers can be in different places in each level). Then whenever the player touched the trigger, the game would load the new map and set the player's location in the new map to the same relative place as the old map, using the markers mentioned before as common reference points between the two levels. The result was a seamless transition between the two levels.

If you don't understand what I'm saying I can create some pictures that explains the whole process in simple terms.

I got the main point with triggers, but I'll be very grateful if you make some pictures.

The red circles show the "transition area" both levels must have in common. The small red lines are the actual triggers. If you touch a trigger, you must:
1) calculate the distance to the trigger
2) load the next level
3) add the distance to the start position of the next level
If you don't add the distance to the level's start position, you always start the new level at the exact same position no matter where you touched the trigger in the previous level.

The yellow dots are the start positions of the next level. Within the transition area, the relative trigger position of the current level MUST be equal to the relative start position of the next level (their real coordinates can be different)

Thank you. I have few questions:
*Will this make movement smooth? Cause if I got you right, the method you showed me, will just place player at the new level, with distance from door from old level's door. Am I right?

* how to make this without loading new level, cause I'll make all levels(rooms) in one big level.
I need to be able to move smoothly between door, as I said before. I need to be able even to stop right between doorways.