How to select mesh faces programmatically?

Hi,

I am new to blender programming (I am using blender 3.72).

I am trying to determine how to select mesh faces along a line in 3D space. I have a terrain represented by a mesh and would like to select those faces that lie along a certain line (direction). I have looked into the different methods that Blender offers but I have not seen how I may achieve this.

Any suggestions or guidance will be helpful, and apologies if this has already been answered (if so, please let me know where I might find the thread).

thank you

M.arcos