Not on part A, the viewportframe is on a separate billboardgui that covers the screen.
I see. So about your explanation you convert the workspace camera in terms of B which is the part the viewport camera cframe is, and part a is the adornee of the surface gui?
Iāve been having problems with this for days.
Making a portal game and I was impressed by what you did so i tried implemented it as my own. 
But i didnāt quite understand your explanation. If you could, please explain it in a way of making the blue portal the adornee of the surfacegui and the viewport camera cframe be the red portal, I would greatly appreciate it.
The method Iām using doesnāt use surfaceGuis, it relies on a billboardgui and glass to simulate cropping camera views to a specific region on the screen.
Trust me, the transformations Iām using alone wonāt suit your needs for surface guis, since the actual perspective of part surfaces will distort the view. I suggest taking a look at other modules like Egomooseās since they account for this distortion.
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