Portal 2 Puzzle Maker/Getting Started
EDITING CHAMBER SURFACES
To edit a chamber surface simply select it with a left mouse click and drag at it's sides where the double arrow symbol appears. To extrude a surface use + and -. + moves the selected surface closer to the camera and - does the opposite, moving the surface further from the camera.
To change a surfaces portalbility select the surfaces you want to change and press P. This will change the selected white portalible surface area into the gray area you can't place portals on and gray to white areas that you can place portals on.