Many thanks!
You saved me!! De: Vincent Cloarec [mailto:vcloa...@gmail.com] Enviada em: Sunday, April 26, 2020 11:35 AM Para: Jorge Almerio <jorgealme...@yahoo.com.br> Cc: qgis-developer <qgis-developer@lists.osgeo.org>; qgis-developer-boun...@lists.osgeo.org Assunto: Re: [QGIS-Developer] Mesh layer Hi, With QGIS master you can use <https://qgis.org/pyqgis/master/core/QgsMeshLayer.html#qgis.core.QgsMeshLayer.updateTriangularMesh> updateTriangularMesh. Before, there is a workaround that consists to just call <https://qgis.org/pyqgis/3.12/core/QgsMeshLayer.html#qgis.core.QgsMeshLayer.createMapRenderer> createMapRenderer without using the renderer. Vincent Le sam. 25 avr. 2020 à 11:32, Jorge Almerio <jorgealme...@yahoo.com.br <mailto:jorgealme...@yahoo.com.br> > a écrit : Hi everyone, Sometimes I got "NaN" return when trying to get scalar value to a point from a Mesh layer. I guess the reason is that it was not rendered previously as said in the documentation. < <https://qgis.org/api/classQgsMeshLayer.html#a07cb62f04b64979500d3873afb580216> https://qgis.org/api/classQgsMeshLayer.html#a07cb62f04b64979500d3873afb580216> QgsMeshDatasetValue: "Note: It uses previously cached and indexed triangular mesh and so if the layer has not been rendered previously (e.g. when used in a script) it returns NaN value" When I turn ON and OFF the loaded mesh layer in the active project it Works! I would like to know if there is a proper way to render the mesh layer, before get values. Below is my code: proj = QgsProject.instance() layerPto = iface.activeLayer() # a Point layer layer = proj.mapLayersByName("mesh01")[0] # a Mesh layer dataset = QgsMeshDatasetIndex(0,0) for feat in layerPto.getSelectedFeatures(): ptoGeo = feat.geometry() pt = ptoGeo.asPoint() value = layer.datasetValue(dataset, pt).scalar() print('elevation={}'.format(value)) _______________________________________________ QGIS-Developer mailing list <mailto:QGIS-Developer@lists.osgeo.org> QGIS-Developer@lists.osgeo.org List info: <https://lists.osgeo.org/mailman/listinfo/qgis-developer> https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: <https://lists.osgeo.org/mailman/listinfo/qgis-developer> https://lists.osgeo.org/mailman/listinfo/qgis-developer
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