A new tool has been added for creating cross sections in a 3D scene. User can pick a region of interest in the 2D map canvas (by clicking three points - start point, end point and cross-section thickness), which will make 3D view filter out everything outside of the region. The camera in the 3D view also gets moved to look at the region of interest from the side.
Compared to the configuration of the extent of the 3D view, cross section tool is both faster to use (it does not need to reload the whole scene when cross section is enabled/disabled) and allows rotated rectangular regions.