Procedural plane invisible in 2D orthographic view

Hi, I’ve currently got a procedurally generated plane creating 2D hilly terrain surface for my vehicle to travel over, however as its being viewed in 2D orthographic camera this plane is not visible - which in itself is not unusual. The result is that you see the vehicle moving up and down the invisible hills.

As I’m new to all of this I’m not sure how to “fill in” the space beneath that procedurally generated hilly plane. I guess one way to do this would be to create a second plane rotated by 90deg that intersects with the first plane? I’m just wanting to fill in everything beneath that top plane that I can add some texture to, in order to create a visible front face to the hills we’re travelling over.

Any pointers would be greatly appreciated.

If anyone has a suggestion on a method to use here please let me know!

is it not a normal problem ?
Can you post a screenshot ?

You should be generating a 3 dimension mesh then. I don’t know how you generate your “hilly planes” but if your generating by filling vertices and triangles arrays whenever you put a vertex on your plane, put one more at the bottom of the hill and in the triangles array create a triangle for the side.