views.py

def gltf(request, lat, lng, distance):

    scale = 100000
    
    pnt = GEOSGeometry(f'POINT({lng} {lat})', srid=4326)
    buildings = Building.objects.filter(outline__distance_lte=(pnt, D(km=distance)))

    scene = Scene()
    centroid_total = (0,0)
    count = 0.0
    for building in buildings:
        height = (building.height / scale / 10) + 0.0001
        c = building.outline.centroid
        centroid_total = (centroid_total[0] + c[0], centroid_total[1] + c[1])
        count += 1
        for o0 in building.outline:
            for o1 in o0:
                polygon = shapely.geometry.Polygon(o1)
                try:
                    scene.add_geometry(creation.extrude_polygon(polygon, height))
                except IndexError:
                    pass
    centroid = (-centroid_total[0]/count, -centroid_total[1]/count, 0)
    t = kwargs_to_matrix(matrix=identity_matrix(), translation=centroid)
    scene.apply_transform(t)
    scene = scene.scaled(scale)

    gltf_data = exchange.gltf.export_glb(scene)

    file_name = f"{lat},{lng},{distance}.glb"
    response = HttpResponse(content=gltf_data, content_type='application/force-download')
    response['Content-Disposition'] = f'attachment; filename={smart_str(file_name)}'
    return response