Simple mesh height alteration.

I’m newish to Unity and still learning,I am looking for a simple piece of code that takes a certain position in my plane and increases my height by say one. I have been searching and haven’t been able to find a simple example that I can follow to extent on. I would prefer the example to be in JavaScript. I have some code that does this to the terrain which I am following alright, but it accesses and changes the terrainData for different positions and I would like to change that for a mesh.

You can download a whole bunch of procedural examples from

http://unity3d.com/support/resources/example-projects/procedural-examples.html

What you want to do is called procedural mesh extrusion, and there are multiple example scenes there with scripts that do what you want (I think they’re even in Javascript).