A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
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Here is Reverse Perspective Camera asset which uses custom projectionMatrix:...
There is a free asset implementing such transition without a MatrixBlender:...
I have used a Vertex Shader to imitate 3D elliptic space (by stereographic projection of 4D sphere): https://bntr.itch.io/sfera [IMG]