I recently posted this on the UE4 Answerhub. Mindfane and I made some progress using a SceneCapture 2d camera that moved and rotated relative to the player, but user Jacky suggested that we post the same question here on the forums to get some more feedback.
As you can see in the video posted by Mindfane, the result is still less-than-optimal. Namely, there is noticeable lag for the image through the portal. I have a feeling this is due to the use of ticks for timing the movement of the scenecapture camera.I recently started using Unreal Engine 4 and was disappointed to see the removal of the UTPortal actor. I've tried experimenting with SceneCapture2D and depth buffers to get a similar effect, but the resulting view, while three-dimensional, lacks any sort of perspective detection and the view remains stationary.
I essentially recreated the effect shown in this video https://www.youtube.com/watch?v=r5XAVy6wE-A
It's certainly better than just a flat real-time 2d texture, but it is a far cry from what the UTPortal actor could do. Does anybody have any ideas?
Any suggestions on how to improve this? Feel free to post any completely different ideas your might have as well.