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extrude_buildings.py
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extrude_buildings.py
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#!/usr/bin/env python
import argparse
import numpy
import sys
import vtk
from vtk.numpy_interface import dataset_adapter as dsa
def runExtrusionExample(seg, dsm, dtm, dest, debug=False, label=None, no_dec=False, no_render=False):
# Read the terrain data
dtmReader = vtk.vtkGDALRasterReader()
dtmReader.SetFileName(dtm)
dtmReader.Update()
# Range of terrain data
lo = dtmReader.GetOutput().GetScalarRange()[0]
hi = dtmReader.GetOutput().GetScalarRange()[1]
bds = dtmReader.GetOutput().GetBounds()
#print("Bounds: {0}".format(bds))
extent = dtmReader.GetOutput().GetExtent()
#print("Extent: {0}".format(extent))
origin = dtmReader.GetOutput().GetOrigin()
#print("Origin: {0}".format(origin))
spacing = dtmReader.GetOutput().GetSpacing()
#print("Spacing: {0}".format(spacing))
# Convert the terrain into a polydata.
surface = vtk.vtkImageDataGeometryFilter()
surface.SetInputConnection(dtmReader.GetOutputPort())
# Make sure the polygons are planar, so need to use triangles.
tris = vtk.vtkTriangleFilter()
tris.SetInputConnection(surface.GetOutputPort())
# Warp the surface by scalar values
warp = vtk.vtkWarpScalar()
warp.SetInputConnection(tris.GetOutputPort())
warp.SetScaleFactor(1)
warp.UseNormalOn()
warp.SetNormal(0, 0, 1)
warp.Update()
# Read the segmentation of buildings
segmentationReader = vtk.vtkGDALRasterReader()
segmentationReader.SetFileName(seg)
segmentationReader.Update()
segmentation = segmentationReader.GetOutput()
scalarName = segmentation.GetPointData().GetScalars().GetName()
segmentationNp = dsa.WrapDataObject(segmentation)
scalars = segmentationNp.PointData[scalarName]
labels = numpy.unique(scalars)
print("All labels: {}".format(labels))
if (debug):
segmentationWriter = vtk.vtkXMLImageDataWriter()
segmentationWriter.SetFileName("segmentation.vti")
segmentationWriter.SetInputConnection(segmentationReader.GetOutputPort())
segmentationWriter.Update()
segmentation = segmentationReader.GetOutput()
sb = segmentation.GetBounds()
print("segmentation bounds: \t{}".format(sb))
# Extract polygons
contours = vtk.vtkDiscreteFlyingEdges2D()
#contours = vtk.vtkMarchingSquares()
contours.SetInputConnection(segmentationReader.GetOutputPort())
if (label):
labels = label
contours.SetNumberOfContours(len(labels))
for i in range(len(labels)):
contours.SetValue(i, labels[i])
#print("DFE: {0}".format(contours.GetOutput()))
if (debug):
contoursWriter = vtk.vtkXMLPolyDataWriter()
contoursWriter.SetFileName("contours.vtp")
contoursWriter.SetInputConnection(contours.GetOutputPort())
contoursWriter.Update()
contoursData = contours.GetOutput()
cb = contoursData.GetBounds()
print("contours bounds: \t{}".format(cb))
if (not no_dec):
# combine lines into a polyline
stripperContours = vtk.vtkStripper()
stripperContours.SetInputConnection(contours.GetOutputPort())
stripperContours.SetMaximumLength(3000)
if (debug):
stripperWriter = vtk.vtkXMLPolyDataWriter()
stripperWriter.SetFileName("stripper.vtp")
stripperWriter.SetInputConnection(stripperContours.GetOutputPort())
stripperWriter.Update()
# decimate polylines
decimateContours = vtk.vtkDecimatePolylineFilter()
decimateContours.SetMaximumError(0.01)
decimateContours.SetInputConnection(stripperContours.GetOutputPort())
if (debug):
decimateWriter = vtk.vtkXMLPolyDataWriter()
decimateWriter.SetFileName("decimate.vtp")
decimateWriter.SetInputConnection(decimateContours.GetOutputPort())
decimateWriter.Update()
contours = decimateContours
# Create loops
loops = vtk.vtkContourLoopExtraction()
loops.SetInputConnection(contours.GetOutputPort())
if (debug):
loopsWriter = vtk.vtkXMLPolyDataWriter()
loopsWriter.SetFileName("loops.vtp")
loopsWriter.SetInputConnection(loops.GetOutputPort())
loopsWriter.Update()
# Read the DSM
dsmReader = vtk.vtkGDALRasterReader()
dsmReader.SetFileName(dsm)
dsmReader.Update()
fit = vtk.vtkFitToHeightMapFilter()
fit.SetInputConnection(loops.GetOutputPort())
fit.SetHeightMapConnection(dsmReader.GetOutputPort())
fit.UseHeightMapOffsetOn()
fit.SetFittingStrategyToPointMaximumHeight()
# Extrude polygon down to surface
extrude = vtk.vtkTrimmedExtrusionFilter()
#extrude.SetInputData(polygons)
extrude.SetInputConnection(fit.GetOutputPort())
extrude.SetTrimSurfaceConnection(warp.GetOutputPort())
extrude.SetExtrusionDirection(0,0,1)
extrude.CappingOn()
extrudeWriter = vtk.vtkXMLPolyDataWriter()
extrudeWriter.SetFileName(dest)
extrudeWriter.SetInputConnection(extrude.GetOutputPort())
extrudeWriter.Update()
if (not no_render):
# Create the RenderWindow, Renderer
#
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer( ren )
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# Create pipeline. Load terrain data.
lut = vtk.vtkLookupTable()
lut.SetHueRange(0.6, 0)
lut.SetSaturationRange(1.0, 0)
lut.SetValueRange(0.5, 1.0)
# Show the terrain
dtmMapper = vtk.vtkPolyDataMapper()
dtmMapper.SetInputConnection(warp.GetOutputPort())
dtmMapper.SetScalarRange(lo, hi)
dtmMapper.SetLookupTable(lut)
dtmActor = vtk.vtkActor()
dtmActor.SetMapper(dtmMapper)
# show the buildings
trisExtrude = vtk.vtkTriangleFilter()
trisExtrude.SetInputConnection(extrude.GetOutputPort())
mapper = vtk.vtkPolyDataMapper()
mapper.SetInputConnection(trisExtrude.GetOutputPort())
mapper.ScalarVisibilityOff()
actor = vtk.vtkActor()
actor.SetMapper(mapper)
# Render it
ren.AddActor(dtmActor)
ren.AddActor(actor)
ren.GetActiveCamera().Elevation(-60)
ren.ResetCamera()
renWin.Render()
iren.Start()
if __name__ == '__main__':
# Demonstrate generation of extruded objects from a segmentation map, where
# the extrusion is trimmed by a terrain surface.
parser = argparse.ArgumentParser(
description='Generate extruded buildings given a segmentation map, DSM and DTM')
parser.add_argument("segmentation", help="Image with labeled buildings")
parser.add_argument("dsm", help="Digital surface model (DSM)")
parser.add_argument("dtm", help="Digital terain model (DTM)")
parser.add_argument("destination", help="Extruded buildings polygonal file (.vtp)")
parser.add_argument('-l', "--label", type=int, nargs="*",
help="Label value(s) used for buildings outlines."
"If not specified, all values are used.")
parser.add_argument("--no_decimation", action="store_true",
help="Do not decimate the contours")
parser.add_argument("--no_render", action="store_true",
help="Do not render")
parser.add_argument("--debug", action="store_true",
help="Save intermediate results")
args = parser.parse_args()
runExtrusion(args.segmentation, args.dsm, args.dtm, args.destination,
args.debug, args.label, args.no_decimation, args.no_render)