Well we need 3D engine for the animation and the character models and for the virtual multiplane camera effects. We also need it for scrolling UVs, for particle effects (fire, smoke, rain, snow, mist, fog) as well for scaling the character models. 3d character models scale better in a 3d engine than they do in 2d raster (non Flash) based engines. With 3d we can do quick costume and texture changes, dynamic lighting on the characters and props, and few can speed up animation times be eliminating the need to ink and paint, and the need to animate each walk direction. Real time 3d offers so many great graphical options and gives you so much flexibility. I am really, really excited by it actually. I fell freed up to do a lot of things the old SCUMM engine couldn�t do so well, or do at all.