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render.py
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render.py
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import numpy as np
import vtk
# Setup Input
a = 0.0 # black hole angular momentum
# Visual Preferences
radius_star = 1000 # radius to draw stars
radius_bh = radius_star*2 # radius to draw the blackhole sphere
# event horizon radius of bh: 1+np.sqrt(1-a*a)
color_ray = [0.5,0.5,1] # light ray color (r,g,b values 0 to 1)
color_bg = [0,0,0] # background color
color_bh = [1,1,1] # black hole color
opacity_bh = 0.7
opacity_ray = 0.1
window_size = [800,800]
ani_stepsize = 1 # only sample every <stepsize> time steps
ani_framerate = 10 # real time between rendering frames (1/fps)
ani_recordsteps = 1000 # total number of steps to record
ani_recordfps = 30 # fps of output video
def draw_trajectories(fname="orbitsxyz.npy"):
# fname: file name of .npy with (x,y,z) of all
# points for each trajectory
if not fname.endswith(".npy"): fname+=".npy"
rays = np.load(fname)
points = vtk.vtkPoints()
lines = vtk.vtkCellArray()
for ray in rays:
for point in ray:
points.InsertNextPoint(point)
# NOTE: This will be the main bottleneck (use vtk c++ if too slow)
for i in range(rays.shape[0]*rays.shape[1]-1):
if (i+1)%(rays.shape[1]) == 0: # do not connect distinct rays
continue
line = vtk.vtkLine()
line.GetPointIds().SetId(0, i)
line.GetPointIds().SetId(1, i + 1)
lines.InsertNextCell(line)
# Configure Sources
linesPolyData = vtk.vtkPolyData()
linesPolyData.SetPoints(points)
linesPolyData.SetLines(lines)
sphere = vtk.vtkSphereSource()
sphere.SetCenter(0,0,0)
sphere.SetRadius(radius_bh)
sphere.SetPhiResolution(32)
sphere.SetThetaResolution(32)
# Configure Mappers
linesMapper = vtk.vtkPolyDataMapper()
linesMapper.SetInputData(linesPolyData)
sphereMapper = vtk.vtkPolyDataMapper()
sphereMapper.SetInputConnection(sphere.GetOutputPort())
# Configure Actors
linesActor = vtk.vtkActor()
linesActor.SetMapper(linesMapper)
linesActor.GetProperty().SetColor(color_ray)
linesActor.GetProperty().SetOpacity(opacity_ray)
sphereActor = vtk.vtkActor()
sphereActor.SetMapper(sphereMapper)
sphereActor.GetProperty().SetOpacity(opacity_bh)
sphereActor.GetProperty().SetColor(color_bh)
# Configure Renderer
ren = vtk.vtkRenderer()
window = vtk.vtkRenderWindow()
window.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(window)
iren.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())
ren.AddActor(linesActor)
ren.AddActor(sphereActor)
ren.SetBackground(color_bg)
window.SetSize(window_size)
# Start
iren.Initialize()
iren.Start()
return
def ani_orbits(fname="orbitsani.npy",record=False,recordfname="movie.ogv"):
# fname: file name of .npy with (t,x,y,z) of all
# points for each trajectory
if not fname.endswith(".npy"): fname+=".npy"
data = np.load(fname)
rays = data[:,:,1:]
times = data[:,:,0]
points = vtk.vtkPoints()
lines = vtk.vtkCellArray()
for ray in rays:
for point in ray:
points.InsertNextPoint(point)
# NOTE: This will be the main bottleneck (use vtk c++ if too slow)
for i in range(rays.shape[0]*rays.shape[1]-1):
if (i+1)%(rays.shape[1]) == 0: # do not connect distinct rays
continue
line = vtk.vtkLine()
line.GetPointIds().SetId(0, i)
line.GetPointIds().SetId(1, i + 1)
lines.InsertNextCell(line)
# Configure Sources
linesPolyData = vtk.vtkPolyData()
linesPolyData.SetPoints(points)
linesPolyData.SetLines(lines)
sphere = vtk.vtkSphereSource()
sphere.SetCenter(0,0,0)
sphere.SetRadius(radius_bh)
sphere.SetPhiResolution(32)
sphere.SetThetaResolution(32)
# Configure Mappers
linesMapper = vtk.vtkPolyDataMapper()
linesMapper.SetInputData(linesPolyData)
sphereMapper = vtk.vtkPolyDataMapper()
sphereMapper.SetInputConnection(sphere.GetOutputPort())
# Configure Actors
linesActor = vtk.vtkActor()
linesActor.SetMapper(linesMapper)
linesActor.GetProperty().SetColor(color_ray)
linesActor.GetProperty().SetOpacity(opacity_ray)
sphereActor = vtk.vtkActor()
sphereActor.SetMapper(sphereMapper)
sphereActor.GetProperty().SetOpacity(opacity_bh)
sphereActor.GetProperty().SetColor(color_bh)
# All of the above, but for stars
stars = [Star(rays[i],times[i]) for i in range(rays.shape[0])]
# Configure Renderer
ren = vtk.vtkRenderer()
window = vtk.vtkRenderWindow()
window.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(window)
iren.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())
# add actors
ren.AddActor(linesActor)
ren.AddActor(sphereActor)
for s in stars: ren.AddActor(s.actor)
ren.SetBackground(color_bg)
window.SetSize(window_size)
iren.Initialize()
# set up timer events
star_iter = StarIterator(stars,iren,times.shape[1]-1,ani_stepsize,record,recordfname)
iren.AddObserver('TimerEvent', star_iter.StepForward)
iren.CreateRepeatingTimer(ani_framerate)
iren.Start()
return
class Star():
def __init__(self,xyz,time,color=[1,1,0]):
self.xyz = xyz
self.time = time # NOTE: UNUSED!
self.source = vtk.vtkSphereSource()
self.source.SetCenter(xyz[0])
self.source.SetRadius(radius_star)
self.source.SetPhiResolution(32)
self.source.SetThetaResolution(32)
self.mapper = vtk.vtkPolyDataMapper()
self.mapper.SetInputConnection(self.source.GetOutputPort())
self.actor = vtk.vtkActor()
self.actor.SetMapper(self.mapper)
self.actor.GetProperty().SetOpacity(1)
self.actor.GetProperty().SetColor(color)
class StarIterator():
def __init__(self,stars,iren,maxstep,stepsize=1,record=False,fname="movie.ogv"):
self.stars = stars
self.step = 0
self.maxstep = maxstep
self.stepsize = stepsize
self.recording = record
if record:
if not fname.endswith(".ogv"): fname+=".ogv"
print ("WRITING NEW VID "+fname)
self.w2if = vtk.vtkWindowToImageFilter()
self.w2if.SetInput(iren.GetRenderWindow())
self.writer = vtk.vtkOggTheoraWriter()
self.writer.SetInputConnection(self.w2if.GetOutputPort())
self.writer.SetFileName(fname)
self.writer.Start()
self.writer.SetRate(ani_recordfps)
self.writer.SetQuality(2)
def StepForward(self, iren, event):
for star in self.stars:
star.source.SetCenter(star.xyz[self.step])
iren.GetRenderWindow().Render()
self.step += self.stepsize
if self.recording:
self.w2if.Modified()
self.w2if.Update()
self.writer.Write()
if self.step>ani_recordsteps:
print("FINISHED WRITING VID")
self.recording = False
self.writer.End()
if self.step > self.maxstep: # loop
self.step = self.step%self.maxstep
def SaveFrame(self,iren):
# screenshot code:
w2if = vtk.vtkWindowToImageFilter()
w2if.SetInput(iren.GetRenderWindow())
w2if.Update()
writer = vtk.vtkAVIWriter()
writer.SetFileName("movie/screenshot%i.png"%self.step)
writer.SetInputConnection(w2if.GetOutputPort())
writer.Write()
return
#eg render orbits stored in orbitsani10.npy, generated by orbits.py
ani_orbits(fname="orbitsani10",record=False)