(CLI):
for feature in layer.getFeatures(): geom = feature.geometry() if not geom.is3D(): # Convert 2D to 3D using Z value from attributes geom.convertToMultiType() # Assume you have an attribute 'height' height = feature['height'] if 'height' in feature else 0 # ... logic to add Z to each vertex else: # Extract vertices verts = geom.constGet().vertices() for v in verts: f.write(f"v v.x() v.y() v.z() 0 0 0\n") # Write faces (triangulation logic omitted for brevity) f.write(f"f vertex_counter vertex_counter+1 vertex_counter+2\n") pyqgis programmer 39s guide 3 pdf work
from qgis.core import QgsProject, QgsVectorLayer, Qgs3DMapSettings from qgis.core import QgsPhongMaterialSettings, QgsPointLightSettings layer = QgsVectorLayer("path/to/your/3d_buildings.shp", "buildings", "ogr") Configure 3D map settings settings = Qgs3DMapSettings() settings.setCrs(QgsProject.instance().crs()) settings.setTerrainVerticalScale(1.0) settings.setTerrainGenerator(None) # No terrain, just features Set extrusion for buildings extrusion_layer = QgsVectorLayerSimple3DRenderer() extrusion_layer.setExtrusionHeight(10) # Height in map units settings.setLayers([layer]) Add a light source light = QgsPointLightSettings() light.setPosition(1000, 1000, 500) settings.setLights([light]) Apply to map canvas (if visual debugging needed) canvas = Qgs3DMapCanvas() canvas.setMapSettings(settings) (CLI): for feature in layer
However, for the automation-focused programmer, the question remains: How do we automate 3D map production and export it to the universally accepted 3D format—PDF? Before we dive into the code, we must
If you have been searching for a way to programmatically produce interactive 3D documents (U3D or PRC format embedded in PDF) using QGIS, you have come to the right place. Before we dive into the code, we must address the elephant in the room: QGIS does not natively export to 3D PDF.
Enter . The QGIS Python API allows developers to script complex 3D scenes, control camera angles, manage terrain textures, and generate export routines. This article serves as your definitive PyQGIS Programmer’s Guide , focusing specifically on the intricate workflow of generating 3D PDFs from QGIS 3 projects.