tutorial: converting mesh to editable poly for editing //step1
3dsmax
Choose any polygonal mesh to work with, in this example I chose a simple cube.
(if you don’t know what a polygonal mesh is, for now you can choose any of the basic primitives to work with).
The edit poly modifier basically makes your mesh editable.
Which means you can move, add and remove vertixes,polygons and edges from your mesh.
right click>convert to>editable poly
or
Go to the modifier panel> object space modifiers> edit poly
Both will basically do the same.
It is important to know that anytime you want to edit your mesh you have to go into the modifier panel and select the edit poly modifier(you don’t have to add it every time, once you did it will stay on the object and you just have to go into its menu again).