The trust flag at the projetc level is only used to read vector layer extent from xml, not from provider.
This flag was not available at the vector layer and data provider level.
We propose a new QgsMapLayer reading flag to propagate the trust layer metadata prohect's read flag an d a new provider options to trust datasource config.
Trusting the datasource config means that the provider can use estimated metadata, the primary key is unique and the detectable geometry type and srid are the same as the requested.
[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.
[MESH][FEATURE] Allow to select only specific subset of dataset groups in mesh layer tree
This could be done in the mesh layer properties dialog in the source tab.
A new tree view displays all the available dataset groups from the data provider. The dataset groups can be checked/unckecked and renamed.
This widget provides also buttons to load extra dataset group from files, to expand/collpase the tree, to check/unchek all items and to reset to default from the provider (for now, only the original name).
Then only the checked dataset group will be displayed in the active dataset widget in renderer settings.
[API] [FEATURE] Add a method in API to snap on mesh elements (vertex, edge, face)
The method returns the position of the snapped point on the closest mesh element :
Introduce a renderer for 1D mesh edges that can vary width over the line. The line can also have different color based on the actual dataset value on the line's point.
Co-authored-by: Peter Petrik <zilolv@gmail.com>
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.
[FEATURE] Implements resampling from values on vertices to values on faces with the neighbor average method. (note that resampling method for datasets defined on faces, e.g., the value on vertices is calculated from value on faces was added in the previous QGIS release)
The default method is set to "none" for resampling from vertices to faces and to "neighbor average" for resampling from faces to vertices. Then the default rendering is now always smooth.
fixes#33978 Allows user to color the mesh layer vector dataset (arrow, stream lines, traces) with color ramp shader depending on the magnitude of the vector.
* 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.
[FEATURE] fix#31575 mesh layer speed rendering improvements (LOD)
As mesh layer could have millions of triangles, rendering could be very slow, especially when all the triangles are displayed in the view whereas triangles are too small to be viewed.
For those situations QGIS has an option to simplify the mesh. Simplification leads to one or more simplified mesh that represents levels of detail (LOD). When rendering the mesh, the appropriate level of detail is chosen to have an adequate rendering depending on the view.
[FEATURE] [MESH] add new 3d stacked mesh averaging methods (top, bottom, sigma, depth, height, elevation)
see https://fvwiki.tuflow.com/index.php?title=Depth_Averaging_Results for description of the methods. method can be selected for 3d stacked mesh dataset in the new widget added for QGIS 3.12 in the mesh layer styling dialog
[FEATURE] [mesh] Load reference time from MDAL when available
Also adds combo box to let the user set the provider time unit. This is particularly useful when MDAL incorrectly recognised the time units in the raw dat format (for example format does nof follow spec and it is not possible to determine if time interval is in hours or days)
fix#32186fix#33399fix#31933
* [feature] support datasets with data defined on faces in mesh calculator, fix#30219, fix#30170
added "driver" and "group name" to the calculator interface.
MDAL now supports 3 drivers for storing results, so user must be able to choose appropriate driver and dataset group name (some drivers store multiple groups to 1 file)
Stacked 3D meshes store values on the volumes that are regularly stacked over base 2d mesh. User can select various 3d to 2d averaging/interpolation method to convert values on volumes (3d) to values on faces (2d) that can be shown in mesh layer. This is achieved by new tab in the mesh layer properties dialog.
* [FEATURE] Static particle traces for rendering mesh vector dataset
This PR permits to display directly in QGIS static particle traces for vector datasets in mesh layer without any plugin.
The user can choose in the mesh layer properties window :
- the color
- the size of the traces (line width)
- the count of particles
- the maximum length of the particle's tail
* [FEATURE] API for rendering frames for mesh vector dataset animation (particles)
Adds a renderer to generate frames that represent particle traces in a vector field of a mesh layer. The renderer cannot be chosen in the current GUI, however crayfish plugin can use API to generate avi/gif files with nice animations representing the movement of (random) particles in the mesh layer vector field.
* [FEATURE] Mesh streamlines
fix#29534
The vector field data set in a mesh layer can currently be only rendered with arrows. This PR adds a new feature to render vector field in mesh layers with streamlines.
The streamlines are seeded from start points. The seeding points can start from the vertices of the mesh, from a used grid or randomly. Streamlines could be coloured or width can be selected.
