When enabled, we will do Delaunay triangulation of the points in the current
map view, and then render triangles instead of points. For each point we keep
its color for interpolation in the triangle.
Global map shading is also supported with the new option, when enabled, we also
keep elevation of each point, and then rasterize triangles with interpolated
elevations to the provided elevation map.
When "Render as a surface" is enabled, drawing order is ignored, because points
do not obscure other points anymore - all input points participate in the triangulation.
There is also an option to filter large triangles (given by the maximum length of
edge of a triangle), which is useful when one wants to see the actual holes in the data.
Compared to the implementation for 3D rendering, the 2D rendering only provides
filtering based on horizontal length of triangles. Filtering based on triangle size
on the vertical axis seems irrelevant because the 2D view is always from the top.
* 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
