How to add a dot to a specific & limited area on a material?

Hi i was wondering how i would go about adding a paramter (for use of MID later) that would allow me to place a dot wherever i wanted in the uv space of that mask. is there a way to 0-1 space those uv’s? i don’t have a clue whats the best way of doing this. This will eventually be used for a radar.
Many Thanks

Hey Twibbz -

The quickest and easiest way is to use a sphere mask that references a Texture Coordinate as below:

The hard part of your request is actually the math required to directly equate real world space to UV space. I am working on something like this for another project, if I can get it solved I will post more information later.

Thank You

Ketchum