Hello, I am sure this is a basic question, but I am starting on Sketchup and missing something (and stuck on my drawing).
I have modelled a large map drawing the terrain, and on a new layer lots of buildings on top. I need to remove the extrusion (gave it a 10 mm height) and somehow “intrude” and revert that terrain to the original state of drawing (in 2D when it was flat) but when i do use the extrude tool and try to “intrude” /“de-extrude” the object disappears, although I need to retain the original perimeter.
In order to simplify, and for test purpose, back to the basics I did open a new document, drew a rectangle, then extruded it updward. Then I tried to extrude the other way down to revert back to the original rectangle perimeter - the intrude does make the rectangle disappears, and the complete object vanish. (in my original drawing my terrain is huge and has many vertical points/lines, but I need to edit it, so I need to revert it back to flat).
Does one can flatten an object / intrude back to it original 2D drawing ? If so what tool can be used ? Many thanks for pointing me in the right direction.