Camera viewport rect change artifacts

Hello, i was experimenting with creating my own cut-scene transition system, when i stumbled the following issue;
8406999--1110516--Artifact.gif
What would be the easiest / best method to make this artifact become a generic black color, like one would normally expect in such a transition effect? (where the camera view-port area becomes smaller on the screen)

I managed to find 1 solution, by adding a second camera object, and setting;
the clear flag to solid color,
the background to black,
the culling mask to nothing,
the depth value to lower then my main camera,
and changed all other settings to be as performant as possible;
8407035--1110522--Solution.gif I feel so stupid for finding a solution so quickly after posting the issue on unity forums, but maybe someone might find this post interesting. Anyway, i would be interested if anyone might have found a better way to achieve this. If you did please leave a comment :slight_smile: