At the time I've originally published this (2021), I wasn't aware of any other similar shaders, either for Fusion or any other engine.
But, one thing I did get from the internet was that texture on the gif that showcased the effect, that texture wasn't created by me.I can't remember where I got that from, but I believe it was from one example using Perspective object.
Edit: ah, I actually credited that on the description, the texture was from an example from YouTube by NomNomNomNation.
The equation used on the shader was based on the source code of the extension, which is public and free to use in any way.
https://github.com/Andos/Perspective/
I've created this a long time ago, so there are things I dislike about, like how I couldn't get zoom factor to stay consistent in different resolutions...
I might just go back to the extension source code and try converting it in a more accurate way.
I'm quite aware that there are other shaders like this, and honestly there are plenty of ways of achieving the same result.
If you've seen this exact shader somewhere else, you can contact me at ClickConverse discord server or directly (naitorstudios is my discord username)
I'm also a moderador at Clickteam community, so perhaps you thought this was a fake account or something.