OK, so pre-rendering the bumpmaps will produce a fairly correct image. Still a major improvement, and will look about as good as SM3 if the tiles are done right.
Sorry about the stupid questions, I haven't been able to pay much attention to this.
It's quite possible to do that right now, with some caveats (the lack of access to Spring's shadowmap with write access being the biggest). However, there are several serious issues:
1. Pop-in would be a bitch. 2. The tree systems would have to use a custom particle system implementation that would be very difficult to reconcile with Spring's behaviors in various areas. 3. You'd need enough LODs to make it fast.
I have no doubt that if somebody had a (licensed) copy of RealTree, we could probably solve #1 and #3. Solving #2 would be pretty hard.
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