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interactor_utils.py
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interactor_utils.py
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import vtk
import numpy as np
import math
# class MyInteractorStyle(vtk.vtkInteractorStyleRubberBand3D):
class MyInteractorStyle(vtk.vtkInteractorStyleTrackballCamera):
"""[VTK class definitions to allow for more natural camera movement (trackpad style)
and keybindings for extra functionality (camera movement, printscreens etc.)]
Arguments:
expects: renderWindowInteractor, render_camera, renderWindow
"""
def __init__(self, parent, camera, renderer, render_window):
self.parent = parent
self.camera = camera
self.renderer = renderer
self.render_window = render_window
self.verbose = False
self.auto_up = True
self.smoothing = 'smooth'
self.AddObserver("MiddleButtonPressEvent", self.middle_button_press_event)
self.AddObserver("MiddleButtonReleaseEvent", self.middle_button_release_event)
self.AddObserver("LeftButtonPressEvent", self.left_button_press_event)
self.AddObserver("LeftButtonReleaseEvent", self.left_button_release_event)
self.AddObserver("KeyPressEvent", self.keyPressEvent)
# self.AddObserver('AnnotationChangedEvent', selectionCallback)
# self.AutoAdjustCameraClippingRange(True)
def camera_zoom_in(self, step=2):
old = np.asarray(self.camera.GetPosition())
new = old *0.9
if self.auto_up:
up = np.asarray([0, 0, 1])
self.camera.SetViewUp(up)
self.camera.SetPosition(tuple(new))
self.render_window.Render()
return
def camera_zoom_out(self, step=2):
old = np.asarray(self.camera.GetPosition())
new = old * 1.1
if self.auto_up:
up = np.asarray([0, 0, 1])
self.camera.SetViewUp(up)
self.camera.SetPosition(tuple(new))
self.render_window.Render()
return
def rotate_clockwise(self, step=2):
old = list(self.camera.GetPosition())
x_coord = old[0]
y_coord = old[1]
if x_coord >= 0:
if y_coord >= 0:
x_sign = -1
y_sign = 1
else:
x_sign = 1
y_sign = 1
elif y_coord >= 0:
x_sign = -1
y_sign = -1
else:
x_sign = 1
y_sign = -1
scale = 0.05
del_x = np.abs(y_coord) * scale * x_sign
del_y = np.abs(x_coord) * scale * y_sign
hypot_1 = math.hypot(old[0], old[1])
new_x = old[0] + del_x
new_y = old[1] + del_y
hypot_2 = math.hypot(new_x, new_y)
rescale = hypot_1/hypot_2
new = old
new[0] = (new_x * rescale)
new[1] = (new_y * rescale)
if self.auto_up:
up = np.asarray([0, 0, 1])
self.camera.SetViewUp(up)
self.camera.SetPosition(tuple(new))
self.render_window.Render()
return
def rotate_anticlockwise(self):
old = list(self.camera.GetPosition())
x_coord = old[0]
y_coord = old[1]
if x_coord > 0:
if y_coord > 0:
x_sign = 1
y_sign = -1
else:
x_sign = -1
y_sign = -1
elif y_coord > 0:
x_sign = 1
y_sign = 1
else:
x_sign = -1
y_sign = 1
scale = 0.05
del_x = np.abs(y_coord) * scale * x_sign
del_y = np.abs(x_coord) * scale * y_sign
hypot_1 = math.hypot(old[0], old[1])
new_x = old[0] + del_x
new_y = old[1] + del_y
hypot_2 = math.hypot(new_x, new_y)
rescale = hypot_1/hypot_2
new = old
new[0] = (new_x * rescale)
new[1] = (new_y * rescale)
if self.auto_up:
up = np.asarray([0, 0, 1])
self.camera.SetViewUp(up)
self.camera.SetPosition(tuple(new))
self.render_window.Render()
return
def rotate_upclockwise(self):
old = list(self.camera.GetPosition())
x_coord = old[0]
y_coord = old[1]
# print(x_coord, y_coord)
d_coord = math.hypot(x_coord, y_coord)
z_coord = old[2]
if z_coord >= 0:
z_sign = 1
d_sign = -1
else:
z_sign = 1
d_sign = 1
scale = 0.05
del_z = np.abs(d_coord) * scale * z_sign
del_d = np.abs(z_coord) * scale * d_sign
hypot_1 = math.hypot(d_coord, z_coord)
new_z = z_coord + del_z
new_d = d_coord + del_d
hypot_2 = math.hypot(new_z, new_d)
rescale = hypot_1/hypot_2
new = old
new[2] = (new_z * rescale)
new_d = (new_d * rescale)
rescale_2 = new_d/d_coord
new[0] = (x_coord * rescale_2)
new[1] = (y_coord * rescale_2)
if self.auto_up:
up = np.asarray([0, 0, 1])
self.camera.SetViewUp(up)
self.camera.SetPosition(tuple(new))
self.render_window.Render()
return
def rotate_downclockwise(self):
old = list(self.camera.GetPosition())
x_coord = old[0]
y_coord = old[1]
d_coord = math.hypot(x_coord, y_coord)
z_coord = old[2]
if z_coord >= 0:
z_sign = -1
d_sign = +1
else:
z_sign = -1
d_sign = -1
scale = 0.05
del_z = np.abs(d_coord) * scale * z_sign
del_d = np.abs(z_coord) * scale * d_sign
hypot_1 = math.hypot(d_coord, z_coord)
new_z = z_coord + del_z
new_d = d_coord + del_d
hypot_2 = math.hypot(new_z, new_d)
rescale = hypot_1/hypot_2
new = old
new[2] = (new_z * rescale)
new_d = (new_d * rescale)
rescale_2 = new_d/d_coord
new[0] = (x_coord * rescale_2)
new[1] = (y_coord * rescale_2)
if self.auto_up:
up = np.asarray([0, 0, 1])
self.camera.SetViewUp(up)
self.camera.SetPosition(tuple(new))
self.render_window.Render()
return
def screenshot(self, scale=1):
w2if = vtk.vtkWindowToImageFilter()
w2if.SetScale(scale)
w2if.SetInput(self.render_window)
w2if.Update()
writer = vtk.vtkPNGWriter()
writer.SetFileName("screenshot.png")
writer.SetInputData(w2if.GetOutput())
writer.Write()
def keyPressEvent(self, obj, event):
key = str(self.parent.GetKeySym())
# check here for available keypresses supported by Qt & VTK
# https://github.com/Kitware/VTK/blob/master/GUISupport/Qt/QVTKInteractorAdapter.cxx
if key == 'Left':
self.rotate_clockwise()
if key == 'Right':
self.rotate_anticlockwise()
if key == 'Up':
self.rotate_upclockwise()
if key == 'Down':
self.rotate_downclockwise()
if key == 'c':
self.screenshot()
if key == 'equal':
self.camera_zoom_in()
if key == 'minus':
self.camera_zoom_out()
if key == 'o':
self.switch_rendering_mode()
if key == 'i':
self.switch_smoothing()
return
def left_button_press_event(self, obj, event):
if self.verbose:
print("left Button pressed")
self.OnLeftButtonDown()
return
def left_button_release_event(self, obj, event):
if self.verbose:
print("left Button released")
self.OnLeftButtonUp()
return
def middle_button_press_event(self, obj, event):
if self.verbose:
print("Middle Button pressed")
self.OnMiddleButtonDown()
return
def middle_button_release_event(self, obj, event):
if self.verbose:
print("Middle Button released")
self.OnMiddleButtonUp()
return
def switch_rendering_mode(self):
# print(dir(self.camera))
projection_mode = self.camera.GetParallelProjection()
if projection_mode == 1:
self.camera.SetParallelProjection(False)
projection_mode = self.camera.GetParallelProjection()
# print(projection_mode)
print('Camera set to Perspective Projection')
else:
self.camera.SetParallelProjection(True)
projection_mode = self.camera.GetParallelProjection()
# print(projection_mode)
print('Camera set to Parallel Projection')
self.render_window.Render()
def switch_smoothing(self):
# renwin = actors = self.render_window
# renderers = renwin.GetRenderers()
# # total_renderers = renderers.GetNumberOfItems()
# renderers.InitializeObjectBase()
# renderers.InitTraversal()
# # for i in range(total_renderers-1):
# render_window = renderers.GetNextItem()
pbr_enabled = self.renderer.GetUseImageBasedLighting()
if self.smoothing == 'smooth':
print('Setting smoothing to flat')
self.smoothing = 'flat'
elif self.smoothing == 'flat':
if pbr_enabled:
print('Setting smoothing to PBR')
self.smoothing = 'pbr'
else:
print('Setting smoothing to gourand')
self.smoothing = 'smooth'
elif self.smoothing == 'pbr':
print('setting smoothing to gourand')
self.smoothing = 'smooth'
actors = self.renderer.GetActors()
actors.InitializeObjectBase()
actors.InitTraversal()
total_actors = actors.GetNumberOfItems()
for j in range(total_actors):
actor = actors.GetNextActor()
actor_name = actor.GetObjectName()
if actor_name is not None:
if actor_name.startswith('surface'):
if self.smoothing == 'smooth':
actor.GetProperty().SetInterpolationToGouraud()
elif self.smoothing == 'pbr':
actor.GetProperty().SetMetallic(1)
actor.GetProperty().SetRoughness(0)
actor.GetProperty().SetInterpolationToPBR()
else:
actor.GetProperty().SetInterpolationToFlat()
self.render_window.Render()
def add_indicator_cube(interactor):
colors = vtk.vtkNamedColors()
axes_actor = vtk.vtkAnnotatedCubeActor()
axes_actor.SetXPlusFaceText('L')
axes_actor.SetXMinusFaceText('R')
axes_actor.SetYMinusFaceText('I')
axes_actor.SetYPlusFaceText('S')
axes_actor.SetZMinusFaceText('P')
axes_actor.SetZPlusFaceText('A')
axes_actor.GetTextEdgesProperty().SetColor(colors.GetColor3d("White"))
axes_actor.GetTextEdgesProperty().SetLineWidth(2)
axes_actor.GetCubeProperty().SetColor(colors.GetColor3d("Blue"))
marker = vtk.vtkOrientationMarkerWidget()
marker.SetOrientationMarker(axes_actor)
marker.SetInteractor(interactor)
marker.EnabledOn()
marker.InteractiveOn()
marker.SetViewport(0.9, 0.0, 1.0, 0.1)
return marker
def add_camera_widget(render_window):
cam_orient_manipulator = vtk.vtkCameraOrientationWidget()
cam_orient_manipulator.SetParentRenderer(render_window)
# Enable the widget.
cam_orient_manipulator.On()
return cam_orient_manipulator
def set_passes(render_window, use_ssao=False):
lightsP = vtk.vtkLightsPass()
opaqueP = vtk.vtkOpaquePass()
translucentP = vtk.vtkTranslucentPass()
volumeP = vtk.vtkVolumetricPass()
collection = vtk.vtkRenderPassCollection()
overlayP = vtk.vtkOverlayPass()
# opaque passes
if use_ssao:
bounds = np.asarray(render_window.ComputeVisiblePropBounds())
b_r = np.linalg.norm([bounds[1] - bounds[0], bounds[3] - bounds[2], bounds[5] - bounds[4]])
occlusion_radius = b_r * 0.1
occlusion_bias = b_r * 0.001
ssaoCamP = vtk.vtkCameraPass()
ssaoCamP.SetDelegatePass(opaqueP)
ssaoP = vtk.vtkSSAOPass()
ssaoP.SetRadius(occlusion_radius)
ssaoP.SetDelegatePass(ssaoCamP)
ssaoP.SetBias(occlusion_bias)
ssaoP.SetBlur(True)
ssaoP.SetKernelSize(256)
collection.AddItem(ssaoCamP)
collection.AddItem(ssaoP)
collection.AddItem(overlayP)
collection.AddItem(lightsP)
collection.AddItem(opaqueP)
# translucent and volumic passes
ddpP = vtk.vtkDualDepthPeelingPass()
ddpP.SetTranslucentPass(translucentP)
ddpP.SetVolumetricPass(volumeP)
collection.AddItem(ddpP)
sequence = vtk.vtkSequencePass()
sequence.SetPasses(collection)
fxaaP = vtk.vtkOpenGLFXAAPass()
fxaaP.SetDelegatePass(sequence)
camP = vtk.vtkCameraPass()
camP.SetDelegatePass(fxaaP)
# overlayP.SetDelegatePass(fxaaP)
render_window.SetPass(camP)
return render_window