How to make a 2D Terrain with opengl?

Question

I want to make a simple 2d terrain with just a few bumps and height changes:

terrain with le car

I thought about just using random numbers to describe the height of a certain vertex, but I don't see how I can make one mesh from this. I'm looking for a way to find the vertex and indices buffers for the terrain.
How do I do this?

possible duplicate of [How to determine indices of a 2d terrain?](http://stackoverflow.com/questions/10422620/how-to-determine-indices-of-a-2d-terrain) — genpfault, May 02 '12 at 23:10
This looks like a candidate for migration to http://gamedev.stackexchange.com/ — John McDonald, May 02 '12 at 23:49
I thought it was mostly openGL programming, but migrate it if neccesary. — user717572, May 03 '12 at 00:01

score 1 · Accepted Answer · answered May 03 '12 at 00:35

You could just use GL_POLYGON with a list of all the vertices with the first and last vertice below the view.

if you want to use a triangle mesh you'll have to create a point directly below each height point(out of view) then the pattern(for clockwise ordering) would be:

for (number of height points-1)
    //vertices
     vertice below height;
     height vertice;
     next_height vertice;

     next height vertice;
     vertice below next height;
     vertice below height;

then working out the indices depends on how you store the vertices, but there will be a similar pattern in the array.

How to make a 2D Terrain with opengl?

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