here something interesting that indon’t udnerstand
but when i go into edit mode and select a few vertex to move theses
it’s like it is in proportional mode and may other vertices are following the movement ?
i mean can somone explain how it is possible without being in proportional mode ?
I downloaded the .blend I think you were looking at (ice_nodes.blend)
Proportional editing is actually turned on in this .blend file.
Settings like window divisions/sizes, proportional editing, etc. are saved with the .blend file, so if the creator of the file had it on when they saved the file, then it will be on when you load it.
There’s also a possibility that the subsurf modifier is applied to your mesh in Edit mode. This makes you work on subsurfed mesh instead of the original mesh (not subdivided). If lines on your mesh flow gently curved around your object, you’re in this mode.
Go to Edit mode and to Modifiers tab. Check subsurf modifier and click on small round icon there. It should disable this mode.