[MDAL-Developer] Python-Bindings

[Martin Dobias]

Hi Paul

Looking great!

I understand this is still work in progress, may I just suggest to make the
API look more pythonic, by using snake case (face_count) instead of camel
case (faceCount)... Maybe also avoid using "get" prefix in getters?

Regards
Martin


On Sat, May 29, 2021 at 2:46 PM Paul Harwood <runette at gmail.com> wrote:

> As promised - I have been working on some Python Bindings. I now have a
> 0.9.0b1 type release :
>
> See https://github.com/ViRGIS-Team/mdal-python
>
> There is a conda install for this in the process of being created.
>
> There is some documentation in the process of being created.
>
> Currently, this integration can:
>
> - read all MDAL compatible file formats,
> - access the metadata for the source,
> - access the vertex, face and edge data as NumPy arrays,
> - access 'double' datasets (both scalar and vector) as NumPy arrays, and
> - convert the MDAL source mesh into a meshio mesh object (with some
> restrictions currently).
> - This version does not currently allow the MDAL source mesh to be written
> or amended.
>
> Note this very much beta and has not been comprehensively tested. The
> following script has been run successfully on a number of different test
> files and shows the usage.
>
> All comments and improvements welcome.
>
> """
>
> import mdalfrom mdal import Datasource
> print(f"MDAL Version:  {mdal.getVersionString()}")print(f"MDAL Driver Count :{mdal.getDriverCount()}")print(mdal.getLastStatus())
> for driver in mdal.getDrivers():
>     print(driver.long_name)
>
> ds = Datasource("data/ply/test_mesh.ply")print(ds.meshes)
> mesh = ds.load(0)print(f"Driver : {mesh.driverName}")print(f"Vertex Count : {mesh.vertexCount}")print(f"Face Count : {mesh.faceCount}")print(f"Largest Face: {mesh.largestFace}")print(f"Edge Count : {mesh.edgeCount}")print(f"CRS : {mesh.projection}")print(f"Mesh extent : {mesh.extent}")print(f"DatasetGroup Count : {mesh.groupCount}")print("")
> mesh = ds.load(ds.meshes[0])print(f"Driver : {mesh.driverName}")print(f"Vertex Count : {mesh.vertexCount}")print(f"Face Count : {mesh.faceCount}")print(f"Largest Face: {mesh.largestFace}")print(f"Edge Count : {mesh.edgeCount}")print(f"CRS : {mesh.projection}")print(f"Mesh extent : {mesh.extent}")
> vertex = mesh.getVertices()print(f"Vertex Array Shape : {vertex.shape}")
> faces = mesh.getFaces()print(f"Face Array Shape : {faces.shape}")
> edges = mesh.getEdges()print(f"Edges Array Shape : {edges.shape}")
> print("")
> group = mesh.getGroup(0)print(f"DatasetGroup Name : {group.name}")print(f"DatasetGroup Location : {group.location}")print(f"Dataset Count : {group.datasetCount}")print(f"Group has scalar values : {group.hasScalar}")print(f"Group has temporal values : {group.isTemporal}")print(f"Reference Time : {group.referenceTime}")print(f"Maximum Vertical Level Count : {group.levelCount}")print(f"Minimum / Maximum ; {group.minmax}")print(f"Metadata : {group.getMetadata()}")
> print("")
> data = group.getDataAsDouble(0)print(f"Dataset Shape : {data.shape}")
>
> """
> (see next email to see results from this code)
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