Following the same pattern in the aforementioned tutorial include hills as some layers and then manipulate them acordingly like that of the road signs. Now since these layers are 2D they are going to look fairly flat when the camera zooms past them so the best way to avoid this or should i say cheat this is by fooling the camera.Now to achieve this look you are going to have to input an expression. Now this does work but since i do not know what your composition looks like i can only assume. So anyway make all your relevant hill layers 3D. Now to the rotaion properties of the x,y and z axis apply the following expression
X: “lookAt(thisComp.activeCamere.position,position)[0]”
Y: “lookAt(thisComp.activeCamere.position,position)[1]”
Z: “lookAt(thisComp.activeCamere.position,position)[2]”
To apply this just alt+Click on the stopwatch beside each property. Once you have inputed the expression select all the layers in question,right-click go to transform>auto-orientate and select the command to auto-orientate towards camera and there you go as the camera passes it will give the illusion that the hills are fully 3D when they are actually 2D. I hope this is of some help. Also check out Andrew Kramer's tutorial on blue Planet 3D where he used this expression. It might help seeing it being demonstrated!
View tutorial.
