Returns the CRS to use for the project when transforming 3D data,
or when z/elevation value handling is important.
The returned CRS will take into account verticalCrs(), e.g. by
returning a compound CRS consisting of crs() + verticalCrs().
This method may still return a 2D CRS, e.g in the case that crs()
is a 2D CRS and no verticalCrs() has been set for the project.
I.E. It is NOT guaranteed that the returned CRS will actually
be a 3D CRS, but rather it is guaranteed that the returned CRS
is **ALWAYS** the most appropriate CRS to use when handling 3D data.
If the project crs() is a compound CRS, then the CRS returned
by QgsProject::verticalCrs() be the vertical component of
QgsProject::crs(). Otherwise it will be the value explicitly
set by a call to setVerticalCrs().
The vertical crs is a persistent property of a project, which
is saved/restored to xml.
* QgsShadingRendering and pipe to render global elevation map
* gdal utils with datatype and resampling method enum
* raster layer elevation map
* optimize raster elevation map with rotation
* handle no data value in the map elevation raster pipe
* mesh layer and some little fixes
* fix nodata and hillshading z factor
* render shading on layout
* activate/deactivate the shading from ui
* shading only for layer that have elevation
* apply Z scale and offset of layer elevation properties
* ui settings
* allow elevation from point cloud even edl is deactivate for pointcloud
* fix ui
* sipify
* Shading renderer widget in styling panel
* icone for shading renderer settings widget
* two methods to combin elevation
* rewording
* remove check box at the bottom of canvas
* use band of elevation properties
* fix styling pannel
* render shading in layout
* keep EDL point cloud shading individually
* add shading rendering tests
* add missing code for local EDL for point cloud
* shading inactive by default
* rework raster layer resampling
* improve nodata in elevation map
* don't allow elevation map with != size to be combined
* remove EDL from point cloud
* renaming
* sipify
* colorize tests
* renaming
* RGB32
* renaming leftover
* some ui fixes
* fix border for EDL alg
* fix EDL closed next to nodata value
* fix first shading when activated
* renaming and typo
* fixes for doc, doxygen, indentation and spelling
* remove leftover member
* fix clang-tidy
* fix edl tests
* fix dll export
* minor fixes
* adapt images of tests
* fix narrowing
* fix indentation
* sipify
* WIP
* minor ui changes
to a new project "capability"
This avoids the unwanted cost of initialising a blank style database
whenever QgsProject::clear is called and project styles are not
required (eg. for server)
