How to fit a plane？

[mooner]

I'm having problems again and now I like to come here for help. I'm currently doing something about 3D measurements and this is something I'm not familiar with. My question is how to fit a plane using multiple coordinates and calculate the distance from any point to the plane?Is there a corresponding module and example for LabVIEW?
I don't want to use a third party tool, that costs too much
 

[HaoXuan]

I would consider this as a mathematics problem. two steps to get what you want:

 

1. 

 

and 2.