No question this time , only a tip:
During the earlier versions of ReCap there was a function within the Elevation Gradient Ramps to directly select points between a chosen Delta Z. This way, you could easily select all points between +2 and +4 meters absolute in your ReCap scene. I lost that function somehwere and now I found it again within the Ranges option.
If you want or need to know also, check out:
http://www.youtube.com/watch?v=4oK9ET9BUTg
Regards,
John