added field points and compute iso confidence
Merge pull request #1 from sunwaylive/virtual-scanner

*change the UI layout to adapt to small screen
Merge pull request #2 from sunwaylive/virtual-scanner

Add NBV algorithm
fixed w2, now the iso confidence is correct
add multiply wlop confidences
*add some basic functions to NBV
*add a btn to camera UI
* add a NBV Parameter
Merge branch 'master' of https://github.com/sunwaylive/Point-Cloud into virtual-scanner
Merge remote-tracking branch 'remotes/origin/quality_map' into virtual-scanner
*begin to implement build grid function