How to make UVS to have a texture/mask always in the center of an object, and always facing the camera?

Development Rendering
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There are some prebuilt UV functions you could use for this. One example is the virtual plane, it will render a flat UV plane with a desired normal vector. Use the camera vector to set up the normal, and it should always face the camera as a result.
I use this a lot for fake transparent effects.

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