I would like to create my own custom virtual set from scratch.

I have read all I can find on the support page on the topic, and have searched the forum for help.

My question is about camera zoom.

I have seen the example on the "Vmix Virtual Set Specification 1.0", and see the example .xml file and format.

My question is HOW do you you get the values to input into that file?

Do I use an external program, for example Adobe Premiere to get the x, y, and z values?

If someone could explain how I get the exact values for the camera zoon when creating a custom set, it would be greatly appreciated.