Perhaps he needs a simpler answer.
Both the mesh terrain and the player need the correct entity properties (so they won't pass through each other).
Entity{PickMode entity,2 etc.
Then set your player above the terrain/mesh and apply a little gravity: TranslateEntity player,0,-1,0 every loop.
Best way get your head around this is (again) to study Mark Sibly's 'Castle' demo.
Both the mesh terrain and the player need the correct entity properties (so they won't pass through each other).
Entity{PickMode entity,2 etc.
Then set your player above the terrain/mesh and apply a little gravity: TranslateEntity player,0,-1,0 every loop.
Best way get your head around this is (again) to study Mark Sibly's 'Castle' demo.