For games like this, sometimes drop shadows might be ok. That’s what I call the type of shadow where there is just a darker oval on the ground underneath… something to give the objects presence instead of looking like they are floating around everywhere.
SimFX has a simple drop-shadow filter:
I creates an egg shaped shaded area underneath the object based on its bounding box. Essentially it does this for anything marked for shadow casting. You can thus even fool it for some objects by creating your own invisible box spatial and marking that to cast instead of the object. Though often the defaults work pretty well.
It works especially well when objects will only rotate around the y axis.
It’s producing the shadows in this picture:
…which is why the shadows aren’t giant ugly streaks down the side of the mountain.
Edit: another example of drop shadows in a more ‘real’ scene: