Video Referenced: https://youtu.be/U5-BfUSFpD8

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AVS Twirl Scale Method (16:9)

Twirl Radius: https://www.desmos.com/calculator/7spfplhfce
Aspect: 0.00

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16:9 Gap Mirror Method Across All Aspect Ratios (Besides 16:9)

Above 16:9 (ex. 1280x536) - https://www.desmos.com/calculator/8uwvkix1pm
Below 16:9 (ex. 960x720) - https://www.desmos.com/calculator/vj85quhqfs

Note: Don't freak out about the corners of the source being there, it's normal