BD authoring is much more complex then DVD authoring as far as the “guts” go, that is only if you want seamless menus. You can actually use DVDit and a product by Ulead if you want basic old school menus (the ones we do now with DVD). All else is another story. There are three options: HDMV mode which is using 8-bit images and muxing them into the streams and also adding basic logic, such as simple animations. Then there is BD-J mode with is full Java coding. The 3rd option is a combo of HDMV mode and BD-J mode, a good example is the movie Cars. This uses both
“Imagination is more important than knowledge” -Albert Einstein