Reactivated RBV view
Connected RectangularBoxViewer to event system. Example: Open the side-by-side view with a 2D map and the RBV and select an AoI on the map. The DEM model will be displayed in the RBV.
(Re)Added SliceViewer
Added 'terrain' layer for RBV DEM view
Fix: row/col ordering of heightfield was swapped