#!/usr/bin/env python

# This example shows how to use cutting (vtkCutter) and how it
# compares with extracting a plane from a computational grid.

import vtk
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()

# Read some data.
pl3d = vtk.vtkMultiBlockPLOT3DReader()
pl3d.SetXYZFileName(VTK_DATA_ROOT + "/Data/combxyz.bin")
pl3d.SetQFileName(VTK_DATA_ROOT + "/Data/combq.bin")
pl3d.SetScalarFunctionNumber(100)
pl3d.SetVectorFunctionNumber(202)
pl3d.Update()
pl3d_output = pl3d.GetOutput().GetBlock(0)

# The cutter uses an implicit function to perform the cutting.
# Here we define a plane, specifying its center and normal.
# Then we assign the plane to the cutter.
plane = vtk.vtkPlane()
plane.SetOrigin(pl3d_output.GetCenter())
plane.SetNormal(-0.287, 0, 0.9579)
planeCut = vtk.vtkCutter()
planeCut.SetInputData(pl3d_output)
planeCut.SetCutFunction(plane)
cutMapper = vtk.vtkPolyDataMapper()
cutMapper.SetInputConnection(planeCut.GetOutputPort())
cutMapper.SetScalarRange(pl3d_output.GetPointData().GetScalars().GetRange())
cutActor = vtk.vtkActor()
cutActor.SetMapper(cutMapper)

# Here we extract a computational plane from the structured grid.
# We render it as wireframe.
compPlane = vtk.vtkStructuredGridGeometryFilter()
compPlane.SetInputData(pl3d_output)
compPlane.SetExtent(0, 100, 0, 100, 9, 9)
planeMapper = vtk.vtkPolyDataMapper()
planeMapper.SetInputConnection(compPlane.GetOutputPort())
planeMapper.ScalarVisibilityOff()
planeActor = vtk.vtkActor()
planeActor.SetMapper(planeMapper)
planeActor.GetProperty().SetRepresentationToWireframe()
planeActor.GetProperty().SetColor(0, 0, 0)

# The outline of the data puts the data in context.
outline = vtk.vtkStructuredGridOutlineFilter()
outline.SetInputData(pl3d_output)
outlineMapper = vtk.vtkPolyDataMapper()
outlineMapper.SetInputConnection(outline.GetOutputPort())
outlineActor = vtk.vtkActor()
outlineActor.SetMapper(outlineMapper)
outlineProp = outlineActor.GetProperty()
outlineProp.SetColor(0, 0, 0)

# Create the RenderWindow, Renderer and both Actors
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)

# Add the actors to the renderer, set the background and size
ren.AddActor(outlineActor)
ren.AddActor(planeActor)
ren.AddActor(cutActor)

ren.SetBackground(1, 1, 1)
renWin.SetSize(400, 300)

cam1 = ren.GetActiveCamera()
cam1.SetClippingRange(11.1034, 59.5328)
cam1.SetFocalPoint(9.71821, 0.458166, 29.3999)
cam1.SetPosition(-2.95748, -26.7271, 44.5309)
cam1.SetViewUp(0.0184785, 0.479657, 0.877262)

iren.Initialize()
renWin.Render()
iren.Start()