Attached Link: http://www.petersharpe.com/

Check the Mist and Water Vapour tutorial. Metaballs usually have problems with volumetric materials. they simply don't appear in render. Lattice, have you checked "solid" in Terrain Editor? The little black triangle above the Terrain Canvas. Off the top of my head, you need a 2D object with a picture of smoke and a mask, actually.

-- erlik