Height map and or points to cloud

Hello
What would be needed for Linuxcnc to do a height map and or points to cloud?
something like this >

It has probing options.....my machine is 5x10'

so let say I put a car hood and want it to probe at a set distance intervals ...what are the steps needed?
if I get the coordinates in txt file it would be sufficient for what I need.

Thank you!

I did a video on this years ago which should help you -

Thank you!
some great info.