I havent finished mine with anything more than one directional light, having some issues setting it up, but they are just issues with things i havent fully studied or tested yet. But it is possible and I have come very close. and again take a look at chrisb's work, his runs at a great speed so its obviously not a case of possibility, but a case of skill. If I keep working on my shadowmapping it should be done within the month, but I may not since right now I am experimenting with OGRE and am really liking it, and even if i switch i might continue since a large part of my income is people needing me to code for a7.