If Carrara 3 didn't have HDRI I would probobly be waiting for version 4. But I'm really into the whole HDRI thing right now, and I don't own a program that supports real HDRI. That's a big selling point for me. That and the fact that rendering is much better and has more options.. From what I've seen, it looks like v3 can render some very photorealistic ultra high quality images... And that's what I'm really after. thanks kaom