#!/usr/bin/env python
from vtkmodules.vtkCommonSystem import vtkTimerLog
from vtkmodules.vtkFiltersCore import vtkElevationFilter
from vtkmodules.vtkFiltersSources import vtkSphereSource
from vtkmodules.vtkRenderingCore import (
    vtkActor,
    vtkPointGaussianMapper,
    vtkPolyDataMapper,
    vtkRenderWindow,
    vtkRenderWindowInteractor,
    vtkRenderer,
    vtkRendererSource,
)
from vtkmodules.vtkRenderingImage import vtkDepthImageToPointCloud
import vtkmodules.vtkInteractionStyle
import vtkmodules.vtkRenderingFreeType
import vtkmodules.vtkRenderingOpenGL2
from vtkmodules.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()

# Parameters for testing
sze = 300

# Graphics stuff
ren0 = vtkRenderer()
ren0.SetViewport(0,0,0.5,1)
ren1 = vtkRenderer()
ren1.SetViewport(0.5,0,1,1)
renWin = vtkRenderWindow()
renWin.SetSize(2*sze+100,sze)
renWin.AddRenderer(ren0)
renWin.AddRenderer(ren1)
iren = vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)

# Create pipeline, render simple object. We'll also color
# the sphere to generate color scalars.
sphere = vtkSphereSource()
sphere.SetCenter(0,0,0)
sphere.SetRadius(1)

ele = vtkElevationFilter()
ele.SetInputConnection(sphere.GetOutputPort())
ele.SetLowPoint(0,-1,0)
ele.SetHighPoint(0,1,0)

sphereMapper = vtkPolyDataMapper()
sphereMapper.SetInputConnection(ele.GetOutputPort())

sphereActor = vtkActor()
sphereActor.SetMapper(sphereMapper)

ren0.AddActor(sphereActor)
ren0.SetBackground(0,0,0)

iren.Initialize()
ren0.ResetCamera()
ren0.GetActiveCamera().SetClippingRange(6,9)
renWin.Render()

# Extract rendered geometry, convert to point cloud
# Grab just z-values
renSource = vtkRendererSource()
renSource.SetInput(ren0)
renSource.WholeWindowOff()
renSource.DepthValuesOnlyOn()
renSource.Update()

# Grab color values
renSource1 = vtkRendererSource()
renSource1.SetInput(ren0)
renSource1.WholeWindowOff()
renSource1.DepthValuesOff()
renSource1.DepthValuesInScalarsOff()
renSource1.Update()

# Note that the vtkPointGaussianMapper does not require vertex cells
pc = vtkDepthImageToPointCloud()
pc.SetInputConnection(0,renSource.GetOutputPort())
pc.SetInputConnection(1,renSource1.GetOutputPort())
pc.SetCamera(ren0.GetActiveCamera())
pc.CullNearPointsOn()
pc.CullFarPointsOn()
pc.ProduceVertexCellArrayOff()
print(pc)

timer = vtkTimerLog()
timer.StartTimer()
pc.Update()
timer.StopTimer()
time = timer.GetElapsedTime()
print("Generate point cloud: {0}".format(time))

pcMapper = vtkPointGaussianMapper()
pcMapper.SetInputConnection(pc.GetOutputPort())
pcMapper.EmissiveOff()
pcMapper.SetScaleFactor(0.0)

pcActor = vtkActor()
pcActor.SetMapper(pcMapper)

ren1.AddActor(pcActor)
ren1.SetBackground(0,0,0)
cam = ren1.GetActiveCamera()
cam.SetFocalPoint(0,0,0)
cam.SetPosition(1,1,1)
ren1.ResetCamera()

renWin.Render()
#iren.Start()