# Get picked vtk actor
**URL:** https://discourse.vtk.org/t/get-picked-vtk-actor/3474
**Category:** Development
**Created:** [June 5, 2020, 2:02pm UTC](https://discourse.vtk.org/t/get-picked-vtk-actor/3474 "2020-06-05T14:02:10Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@jjjl](https://discourse.vtk.org/u/jjjl)
#### Post date: [June 5, 2020, 2:02pm UTC](https://discourse.vtk.org/t/get-picked-vtk-actor/3474/1 "2020-06-05T14:02:10Z")
my vtk setup looks like this: I have displayed 1 DICOM image as a vtk2DActor (rendered in one renderer) and on top of the vtk2DActor I have placed a bunch of other vtk2DActors based on a vtkImageCanvasSource. My code for displaying my actors looks like the following:
```auto
def display(actors_image_layer, actors_circle_layer, size):
image_renderer = vtk.vtkRenderer()
scene_renderer = vtk.vtkRenderer()
render_window = vtk.vtkRenderWindow()
image_renderer.SetLayer(0)
scene_renderer.SetLayer(1)
render_window.SetNumberOfLayers(2)
render_window.AddRenderer(image_renderer)
render_window.AddRenderer(scene_renderer)
render_window_interactor = vtk.vtkRenderWindowInteractor()
render_window_interactor.SetRenderWindow(render_window)
render_window_interactor.AddObserver('LeftButtonPressEvent',
left_button_pressed)
for actor in actors_image_layer:
image_renderer.AddActor(actor)
for actor in actors_circle_layer:
scene_renderer.AddActor(actor)
render_window.SetSize(size[0], size[1])
render_window.Render()
render_window_interactor.Initialize()
render_window_interactor.Start()
```
As you can see, I added an observer for when the left button is pressed. When this observer is called I want to select the picked actor, the code looks like the following.
```auto
def left_button_pressed(obj: vtk.vtkRenderWindowInteractor, ev):
click_pos = obj.GetEventPosition()
picker = vtk.vtkPropPicker()
picker.Pick(click_pos[0],
click_pos[1],
0,
obj.FindPokedRenderer(click_pos[0], click_pos[1]))
poked_renderer = obj.FindPokedRenderer(click_pos[0], click_pos[1])
actor = picker.GetActor()
print("Poked renderer:", poked_renderer)
print("Number of visible actors in renderer:", poked_renderer.VisibleActorCount())
print("Picked actor:", actor)
```
My problem is, that picker.GetActor() returns None. Even though a renderer was found and this renderer has 43 visible actors.
I hope someone can point me in the right direction so I can pick the correct actor. Thanks for your help!
---
### Author:  [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [June 5, 2020, 5:20pm UTC](https://discourse.vtk.org/t/get-picked-vtk-actor/3474/2 "2020-06-05T17:20:40Z")
I would suggest to try different pickers. I had problems with vtkPropPicker while others worked well.
---
### Author:  [@jjjl](https://discourse.vtk.org/u/jjjl)
#### Post date: [June 6, 2020, 12:16pm UTC](https://discourse.vtk.org/t/get-picked-vtk-actor/3474/3 "2020-06-06T12:16:11Z")
Hey Andras, I changed my actors to type vtk.vtkImageActor instead of vtk.vtkActor2D, now I can use the vtkAreaPicker. Thanks your input!