Quote - "Does anyone know if you can alter the orientation of ecosystem elements with a bitmap so you can determine which direction houses face, for instance?"

That has been discussed more than once in this forum. As far as I remember, there was never a satisfactory answer (i.e, a fully automatic method). I don't know the answer. Maybe eonite and ArtPearl will come to your rescue here as they seem to have mastered the mathematics behind the function editor (see other recent threads). :-)