hello si i try to make that when i click somewhere on the mesh the postion of the click go in my var but i doesn’t word
i need help pls TwT
There you go! 
our pointer observable(s) provide the picking info for you, already calculated with the right predicate.
oh okay now in need to understand how to pick the exact spot where i click on the mesh and not just the mesh because i want to draw a line beetween two mesh , i don’t know if it’s clear ? my english is so bad
Most of us are not native english speakers! don’t worry about your english
The pick result returns a pickedPoint as well:
thanks do u know the documentation for helping me doing what i need ? Creating 2 gui
1 for the first take position with left click
2 for the second take position with right click
And maybe how to draw a line beetween them ?
Right click is the same as standard picking, you just need to find out which button index is used.
About GUI, This is the best docs for our GUI system - Babylon.js docs