VtkLocalView not syncing if actors are removed

[banesullivan]

I have modified examples/06_vtk/01_SimpleCone/LocalRendering.py to have a delete button that will remove the actor from the render window. However, on view.update, the data being removed is not synced to the client renderer.

This is the added code:

def remove_actor():
    renderer.RemoveActor(actor)
    renderer.Modified()
    ctrl.view_update()

...

        with vuetify.VBtn(icon=True, click=remove_actor):
            vuetify.VIcon("mdi-delete")

and this is the full example:

r"""
Version for trame 1.x - https://github.com/Kitware/trame/blob/release-v1/examples/VTK/SimpleCone/LocalRendering.py
Delta v1..v2          - https://github.com/Kitware/trame/commit/674f72774228bbcab5689417c1c5642230b1eab8
"""

from trame.app import get_server
from trame.widgets import vuetify, vtk
from trame.ui.vuetify import SinglePageLayout

from vtkmodules.vtkFiltersSources import vtkConeSource
from vtkmodules.vtkRenderingCore import (
    vtkRenderer,
    vtkRenderWindow,
    vtkRenderWindowInteractor,
    vtkPolyDataMapper,
    vtkActor,
)
from vtkmodules.vtkInteractionStyle import vtkInteractorStyleSwitch  # noqa

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

server = get_server()
state, ctrl = server.state, server.controller

state.trame__title = "VTK Remote View - Local Rendering"

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

DEFAULT_RESOLUTION = 6

renderer = vtkRenderer()
renderWindow = vtkRenderWindow()
renderWindow.AddRenderer(renderer)

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

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

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


@state.change("resolution")
def update_cone(resolution=DEFAULT_RESOLUTION, **kwargs):
    cone_source.SetResolution(resolution)
    ctrl.view_update()


def update_reset_resolution():
    state.resolution = DEFAULT_RESOLUTION


def remove_actor():
    renderer.RemoveActor(actor)
    renderer.Modified()
    ctrl.view_update()


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

with SinglePageLayout(server) as layout:
    layout.icon.click = ctrl.view_reset_camera
    layout.title.set_text("Cone Application")

    with layout.toolbar:
        vuetify.VSpacer()
        vuetify.VSlider(
            v_model=("resolution", DEFAULT_RESOLUTION),
            min=3,
            max=60,
            step=1,
            hide_details=True,
            dense=True,
            style="max-width: 300px",
        )
        vuetify.VDivider(vertical=True, classes="mx-2")
        with vuetify.VBtn(icon=True, click=update_reset_resolution):
            vuetify.VIcon("mdi-undo-variant")

        with vuetify.VBtn(icon=True, click=remove_actor):
            vuetify.VIcon("mdi-delete")

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


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

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

[banesullivan]

If I refresh the whole webpage, this is synced I think? though the view goes white even though the renderer background is black so perhaps something is failing and the view is not shown

[jourdain]

The issue is related when there is an empty renderer. If you have a sphere on top of the cone, the removing of 1 actor will work.

[banesullivan]

I'm unable to delete any actor and have it synced:

src = vtkSphereSource()
src.Update()
mapper2 = vtkPolyDataMapper()
actor2 = vtkActor()
mapper2.SetInputConnection(src.GetOutputPort())
actor2.SetMapper(mapper2)
renderer.AddActor(actor2)

... 

def remove_actor():
    renderer.RemoveActor(actor2)
    renderer.Modified()
    ctrl.view_update()
    print('should have been deleted')

Screen.Recording.2022-10-17.at.1.31.02.PM.mov

Full script:

r"""
Version for trame 1.x - https://github.com/Kitware/trame/blob/release-v1/examples/VTK/SimpleCone/LocalRendering.py
Delta v1..v2          - https://github.com/Kitware/trame/commit/674f72774228bbcab5689417c1c5642230b1eab8
"""

from trame.app import get_server
from trame.widgets import vuetify, vtk
from trame.ui.vuetify import SinglePageLayout

from vtkmodules.vtkFiltersSources import vtkConeSource, vtkSphereSource
from vtkmodules.vtkRenderingCore import (
    vtkRenderer,
    vtkRenderWindow,
    vtkRenderWindowInteractor,
    vtkPolyDataMapper,
    vtkActor,
)
from vtkmodules.vtkInteractionStyle import vtkInteractorStyleSwitch  # noqa

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

server = get_server()
state, ctrl = server.state, server.controller

state.trame__title = "VTK Remote View - Local Rendering"

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

DEFAULT_RESOLUTION = 6

renderer = vtkRenderer()
renderWindow = vtkRenderWindow()
renderWindow.AddRenderer(renderer)

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

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


src = vtkSphereSource()
src.Update()
mapper2 = vtkPolyDataMapper()
actor2 = vtkActor()
mapper2.SetInputConnection(src.GetOutputPort())
actor2.SetMapper(mapper2)
renderer.AddActor(actor2)

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


@state.change("resolution")
def update_cone(resolution=DEFAULT_RESOLUTION, **kwargs):
    cone_source.SetResolution(resolution)
    ctrl.view_update()


def update_reset_resolution():
    state.resolution = DEFAULT_RESOLUTION


def remove_actor():
    renderer.RemoveActor(actor2)
    renderer.Modified()
    ctrl.view_update()
    print('should have been deleted')


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

with SinglePageLayout(server) as layout:
    layout.icon.click = ctrl.view_reset_camera
    layout.title.set_text("Cone Application")

    with layout.toolbar:
        vuetify.VSpacer()
        vuetify.VSlider(
            v_model=("resolution", DEFAULT_RESOLUTION),
            min=3,
            max=60,
            step=1,
            hide_details=True,
            dense=True,
            style="max-width: 300px",
        )
        vuetify.VDivider(vertical=True, classes="mx-2")
        with vuetify.VBtn(icon=True, click=update_reset_resolution):
            vuetify.VIcon("mdi-undo-variant")

        with vuetify.VBtn(icon=True, click=remove_actor):
            vuetify.VIcon("mdi-delete")

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


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

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