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I am trying to create a Meshlayer in memory and tried this simple test in QGIS 3.6:

from qgis.core import QgsProject,QgsMeshLayer proj = QgsProject.instance() uri="1.0, 2.0 \n2.0, 2.0 \n3.0, 2.0 \n2.0, 3.0 \n1.0, 3.0 \n---0, 1, 3, 4 \n1, 2, 3 \n" outLayer = QgsMeshLayer( uri, 'test', "memory_mesh") proj.addMapLayer(outLayer) Apparently dataprovider has no attribute name and QGIS crashes. Is there something that I am doing wrong? What shoulb be the format of URI, a simple string?

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  • correct provider name is mesh_memory
    – Peter
    Aug 20, 2021 at 6:32

1 Answer 1

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This is a mistake in the documentation. It needs to be mesh_memory and not memory_mesh. Also the documentation is missing one \.

So in QGIS 3.12 it works perfectly:

uri="1.0, 2.0 \n" \
    "2.0, 2.0 \n" \
    "3.0, 2.0 \n" \
    "2.0, 3.0 \n" \
    "1.0, 3.0 \n" \
    "---" \
    "0, 1, 3, 4 \n" \
    "1, 2, 3 \n"
scratchLayer = QgsMeshLayer(uri, "My Scratch layer", "mesh_memory")
QgsProject.instance().addMapLayers([scratchLayer])
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  • The documentation qgis.org/pyqgis/3.16/core/… is correct and the critical code snipped haven't changed for the last 3 years. In which doc you found the mistake?
    – Peter
    Aug 20, 2021 at 6:32
  • Hi @Peter a bit of a long shot, after over a year, but I fixed that back in the days myself: github.com/qgis/QGIS/pull/35218/commits/… since it got accepted, I believe it was wrong before.
    – mistapink
    Aug 20, 2021 at 7:42
  • very good approach to fix it! thanks for that
    – Peter
    Aug 20, 2021 at 7:47

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