RemoteRendering.py

r"""
Version for trame 1.x - https://github.com/Kitware/trame/blob/release-v1/examples/VTK/ContourGeometry/RemoteRendering.py
Delta v1..v2          - https://github.com/Kitware/trame/commit/3852cba56cd63f6efa684d5e5fb00881a6111e81

Installation requirements:
    pip install trame trame-vuetify trame-vtk
"""

from pathlib import Path

import vtkmodules.vtkRenderingOpenGL2  # noqa
from vtkmodules.vtkFiltersCore import vtkContourFilter

# VTK factory initialization
from vtkmodules.vtkInteractionStyle import vtkInteractorStyleSwitch  # noqa
from vtkmodules.vtkIOXML import vtkXMLImageDataReader
from vtkmodules.vtkRenderingCore import (
    vtkActor,
    vtkPolyDataMapper,
    vtkRenderer,
    vtkRenderWindow,
    vtkRenderWindowInteractor,
)

from trame.app import get_server
from trame.ui.vuetify import SinglePageLayout
from trame.widgets import vtk as vtk_widgets
from trame.widgets import vuetify

# -----------------------------------------------------------------------------
# Trame initialization
# -----------------------------------------------------------------------------

server = get_server(client_type="vue2")
state, ctrl = server.state, server.controller

state.trame__title = "VTK contour - Remote/Local rendering"

# -----------------------------------------------------------------------------
# VTK pipeline
# -----------------------------------------------------------------------------

data_directory = Path(__file__).parent.parent.with_name("data")
head_vti = data_directory / "head.vti"

reader = vtkXMLImageDataReader()
reader.SetFileName(head_vti)
reader.Update()

contour = vtkContourFilter()
contour.SetInputConnection(reader.GetOutputPort())
contour.SetComputeNormals(1)
contour.SetComputeScalars(0)

# Extract data range => Update store/state
data_range = reader.GetOutput().GetPointData().GetScalars().GetRange()
contour_value = 0.5 * (data_range[0] + data_range[1])
state.data_range = data_range

# Configure contour with valid values
contour.SetNumberOfContours(1)
contour.SetValue(0, contour_value)

# Rendering setup
renderer = vtkRenderer()
renderWindow = vtkRenderWindow()
renderWindow.AddRenderer(renderer)

renderWindowInteractor = vtkRenderWindowInteractor()
renderWindowInteractor.SetRenderWindow(renderWindow)
renderWindowInteractor.GetInteractorStyle().SetCurrentStyleToTrackballCamera()

mapper = vtkPolyDataMapper()
actor = vtkActor()
mapper.SetInputConnection(contour.GetOutputPort())
actor.SetMapper(mapper)
renderer.AddActor(actor)
renderer.ResetCamera()
renderWindow.Render()

# -----------------------------------------------------------------------------
# Callbacks
# -----------------------------------------------------------------------------


@state.change("contour_value", "interactive")
def update_contour(contour_value, interactive, force=False, **kwargs):
    if interactive or force:
        contour.SetValue(0, contour_value)
        ctrl.view_update()


def commit_changes():
    update_contour(
        contour_value=state.contour_value,
        interactive=state.interactive,
        force=True,
    )


# -----------------------------------------------------------------------------
# GUI
# -----------------------------------------------------------------------------

with SinglePageLayout(server) as layout:
    layout.title.set_text("Contour Application - Remote rendering")
    layout.icon.click = ctrl.view_reset_camera

    with layout.toolbar:
        vuetify.VSpacer()
        vuetify.VSwitch(
            v_model=("interactive", False),
            hide_details=True,
            label="Update while dragging",
        )
        vuetify.VSlider(
            v_model=("contour_value", contour_value),
            change=commit_changes,
            min=("data_range[0]",),
            max=("data_range[1]",),
            hide_details=True,
            dense=True,
            style="max-width: 300px",
        )
        vuetify.VSwitch(
            v_model="$vuetify.theme.dark",
            hide_details=True,
        )
        with vuetify.VBtn(
            icon=True,
            click=ctrl.view_reset_camera,
        ):
            vuetify.VIcon("mdi-crop-free")

    with layout.content:
        with vuetify.VContainer(
            fluid=True,
            classes="pa-0 fill-height",
        ):
            # view = vtk_widgets.VtkLocalView(renderWindow)
            view = vtk_widgets.VtkRemoteView(renderWindow)
            ctrl.view_update = view.update
            ctrl.view_reset_camera = view.reset_camera
            ctrl.on_server_ready.add(view.update)


# -----------------------------------------------------------------------------
# Main
# -----------------------------------------------------------------------------

if __name__ == "__main__":
    server.start()