[FEATURE] Introduces mesh virtual datasets
With the mesh calculator the user can choose to create those "virtual" dataset groups that will be added to the layer. Then, for these dataset groups, values are not stored in memory but each dataset is calculated when needed whit the formula entered in the mesh calculator.
Those virtual dataset groups are saved with the project.
If needed, the user can remove them or can persist them on files to make them persistent.
Co-authored-by: Étienne Trimaille <gustrimaille@yahoo.fr>
[FEATURE] Introduces memory dataset groups for mesh layer. These dataset groups are temporary and are not kept when the project is closed.
Memory dataset groups can be created from the mesh calculator with a new option.
Allows the possibility to remove or save these memory dataset groups to a file with specified driver.
Allow load of multiple (sub-)meshes from a single file. If file contains multiple meshes (e.g. UGRID file), user needs to select the meshes to load from the dialog.
* MDAL 0.5.90 : support for custom Logger and 1D meshes
* [FEATURE] [MESH] Support rendering of 1D meshes, see https://github.com/qgis/QGIS-Enhancement-Proposals/issues/164
1D mesh consist of edges (edge is straight line segment with 2 vertices) and the data that is defined on either
vertices or edges. Such data can be loaded by MDAL and rendered as mesh layer in QGIS.
Introducting MDAL, QgsMeshLayer, mesh data providers (mesh_memory, mdal)
to read and visualize raw meshes: vertices and faces. Support dragging
2dm files from browser on canvas to visualize 2dm meshes.
Support for QgsMeshLayer in Python API.
