Hi Dico!

Unfortunately, screen you've posted doesn't show up :<
About shaders and what Rackscha said, I guess using shaders will be faster plus it does that 'cut-off' effect. I've done it differently (cause I'm not familiar with shaders) and just rendered view directly on the texture of the portal model (and I guess this is one of the worst ways to do this). Anyway, I'm still stuck and breaking my brain on how to add player's position/angles into the portal view, so it does look like a whole into the other room (f.e.) not like a flat TV.

Best regards!

Haha this is my problem too , but with right angles and position


this is another image link : http://i.imgur.com/3CJkwwE.jpg

Now I see it. Well one of my main problem is, that I can't pick right words for search for those calculation things. I'm pretty sure there are some kind of a tutorials with basic calculations/algorithms etc.

Best regards!

I get the idea from this video : https://www.youtube.com/watch?v=51BSdESAMwM
so you can calcule the portal cam movement from player cam view.

Maybe this will help (note: these links will take you to our nemesis, you have been warned ):

http://answers.unity3d.com/questions/39509/portal-2-how-to-make-a-portal-in-unity-3d.html
http://answers.unity3d.com/questions/455799/is-it-posable-to-make-a-gun-shoot-a-portal.html

, the answer here is probably shaders. You may also try changing the VIEW's arc to 'warp' your flatscreen TV (perhaps also try aspect).

PS: just some random silly idea that popped up in my head, perhaps create a dummy entity for that you see in the portal but render it behind your player.

Nice video, it shows exactly what I'm trying to come up with instead of current 'flat' views

Ohhh noooo, my eyes
Changing arc etc won't really help in my situation (sure they will need to be tweaked at the end, but the problem is that I need to add camera's positions/angles on the top of the view positions/angles (the view, which is rendered on the texture of the portal). At least this is what I think I need to do, but I just can't get the math part


Best regards!

Can't your rotate the portal's VIEW with the player's camera? Perhaps deforming/changing its shape so it doesn't look like you rotate the VIEW with the player? (just a wild quess)

ps: doesn't unreal 1 (not UT 1, but unreal) has also 'real' portals? Not does it matter much, but perhaps it can give you ideas.

Sure you can, and I guess that's the key to sucsess But the problem is, that simply moving/rotating it won't help. I need some kind of algorithm which will calculate all those rotations/movement stuff automatically. F.e. Uhrwerk said this about rotation:
And I got it to work somehow, but without movement only rotation looks really weird (or maybe it just doesn't work correctly ).


Take a look at this. As the video describtion says:
Maybe Unreal had same non-euclidean geometry support, I don't know unfortunately. Tomorrow I'll make a small research probably, it's too late right now here at my place.


Edit: Here is what I've made so far right now (code is dirty and too many comments I know, just ignore them ):
Download link

Hi,
I can imagine the way but never did it.

It needs portals as two different models. One looking to +X axe and the other to -X axe, so both models share their orientation in reference to the wall. First portal is placed looking in front of the wall and the second looking to the wall.

It needs three cameras, one for player and one for each portal. All same render target size and arc. Portal cameras are placed by computing offsets from portals to player, rotating them by portals inverse orientations (in order to get the offsets in object space of each portal), rotating them again by opposite portals orientations and adding opposite portals positions. The process is same for orientations but with angles, you know. As Wjbender stated, portal cameras need a clipping plane to be set so polygons behind portals are not drawn. Look at cameras PORTALCLIP flag, no mysteries. Portal cameras have to be rendered before player camera.

The shader of portals has to calculate the screen space coords of vertex inside vertex shader and sample the render target of their linked camera on pixel shader. I can't find the algorithm right now but it is very simple.

edited___________

if I am not wrong...

I found an example on unity for the view angles , I am sure someone here can translate the math .

http://answers.unity3d.com/questions/992289/portal-effect-using-render-textures-how-should-i-m.html