Yeah, 3rd person is definitely going to be a bit more complicated if you want something seamless.
I should mention I also have that slight “pop”. Its like literally one frame. My current workaround is to simply fade into white and back out while going through quite quickly, which masks the effect, but this dosent make it as seamless as I’d want it to be. My portals are also still largely a work in progress, but I’ll try to contribute as much as I can to getting something good. The other last major issue I have with them is optimization. They drain FPS so much from the scene captures, at least when I try to play it full resolution. My current solution is to divide the render target in half of the viewport resolution, which maintains the aspect ratio and a steadily high FPS, but unfortunately makes it a bit more blurry. I also stop updating the render target if the player is a good amount away from them too, but still :\
