Terrain: Get world coordinates of sample points

Hi,

I would like to get the world coordinates of some samples from a terrain in the scene. I know how to get terrain data below a random object, but I don't know how to get world coordinates of a random point in my terrain.

In essence, I need to get a number of points of a terrain composed of multiple subterrains. Once I know how to achieve this with a single terrain, it shouldn't be too difficult to adapt the code for multiple terrains in the same scene.

I hope you can help me in this regard.

Thank you.