How Can I Draw Grid On Terrain.

Hi~ I'm Korean Unity3D User. Recently I'm Playing 'Tiger Woods PGA Tour Online' Because I Heard That Game Was Developed By Unity3D Engine. When Playing The Game, I Saw Grid Is Drawn On Terrain When Ball Is On The Green. So I Wonder How Can Draw Grid Like That On Terrain. I Hope Someone's Help. Thank You~~

well i would try a projector with a grid texture...

read about projectors here i would make a orthographic projector that is the same size as the terrain.

Simple example without projectors or shaders