[vtkusers] Actor -- isMovable?
Piotr Byzia
piotr.byzia at gmail.com
Thu Nov 5 08:46:20 EST 2009
Thank you Cory,
This explains everything :-)
And it'd be a perfect solution if there were some kind of offset when
picking an object to act on.
I couldn't find anything helpful on http://www.vtk.org/doc/release/4.0/html/classvtkInteractorStyleTrackballActor.html
but maybe it's some different class I should be looking in?
In my case, actors are molecules in lines representation (sample http://media.piotr.byzia.pl/molecule_lines.PNG
) and it's hard to target a single line to rotate / zoom it, thus
vtkInteractorStyleTrackballCamera was ideal: I could rotate a molecule
wherever I pressed a mouse button.
However, imagine 2 molecules in the same window, now, I want to be
able to pick only one of them and rotate etc. so I can't use a
TrackballCamera mode, and TrackballActor is a pain with those lines...
If you still have a patience, my additional questions are, how can I
retrieve a coordinates (the same code as previously pasted in this
message) of all points used to draw a lines, after rotating my molecule?
And the last one, as I mentioned earlier, I was able to set actor
VisibilityOff() property from my GUI, but the change is made only
after I move mouse over the rendering window. How can I update window
right after the property has been set?
I tried
my_actor.GetMapper().GetInput().Update()
ren.Render()
ren.Render().Update()
ren is QVTKWindowInteractor instance. I guess this is the source of my
problem, while there are only a few methods overloaded.
I'd appreciate any pointers, which method I should add there so that
updating will work.
Thank you,
Piotr Byzia
On 05.11.2009, at 13:52, Cory Quammen wrote:
> Piotr,
>
> The interactor style you have let's you switch between two modes. In
> one mode, you are moving the camera. Mouse motions in the window will
> affect the camera, but it will not change the actors position or
> orientation in world space. Sure, they appear to move on the screen,
> but what you see really comes from the camera moving. In this mode,
> calling PickableOff() won't have any effect because you aren't picking
> any actors.
>
> The other mode, however, lets you pick individual actors and change
> their position, orientation, and scale in world space. For this mode,
> you *can* pick actors and change these properties. Calling
> PickableOff() will have an effect here; it will prevent you from
> picking and subsequently modifying the actor position, orientation,
> and scale.
>
> In your code, the first mode is what you have. To see what the second
> mode is like, you might try
>
> widget_3d.GetRenderWindow().GetInteractor().GetInteractorStyle
> ().SetCurrentStyleToTrackballActor()
>
> This mode will let you manipulate individual actors, unless of course
> you set them to PickableOff(). This seems to me close to what are you
> going for.
>
> I hope that helps,
> Cory
>
> On Thu, Nov 5, 2009 at 5:48 AM, Piotr Byzia <piotr.byzia at gmail.com>
> wrote:
>> Hi Karthik,
>> I disabled the interactor style, however I still can rotate my
>> actor (by the
>> mouse interaction).
>> This's what I've done:
>> widget_3d.GetRenderWindow().GetInteractor().GetInteractorStyle
>> ().EnabledOff()
>> my_actor.PickableOff()
>> widget_3d is an instance of
>> QVTKRenderWindowInteractor.QVTKRenderWindowInteractor(self)
>> Below is an output
>> for widget_3d.GetRenderWindow().GetInteractor().GetInteractorStyle()
>> Let me know if there is any other information which might help.
>> vtkInteractorStyleSwitch (0E995418)
>> Debug: Off
>> Modified Time: 945
>> Reference Count: 2
>> Registered Events: (none)
>> Current Renderer: 00000000
>> Default Renderer: 00000000
>> Enabled: 0
>> Priority: 0
>> Interactor: 0E9418D0
>> Key Press Activation: Off
>> Key Press Activation Value: i
>> Auto Adjust Camera Clipping Range On
>> Pick Color: (1, 0, 0)
>> CurrentRenderer: 00000000
>> Picked Renderer: (none)
>> Current Actor: (none)
>> Interactor: 0E9418D0
>> Prop Picked: No
>> State: 0
>> UseTimers: 0
>> HandleObservers: 1
>> MouseWheelMotionFactor: 1
>> Timer Duration: 10
>> CurrentStyle 0E9A3818
>> vtkInteractorStyleTrackballCamera
>> Debug: Off
>> Modified Time: 1703
>> Reference Count: 1
>> Registered Events:
>> Registered Observers:
>> vtkObserver (0E9912B8)
>> Event: 41
>> EventName: EndInteractionEvent
>> Command: 0E9A58E0
>> Priority: 0
>> Tag: 2
>> vtkObserver (0E9906B0)
>> Event: 39
>> EventName: StartInteractionEvent
>> Command: 0E9A58E0
>> Priority: 0
>> Tag: 1
>> Current Renderer: 00000000
>> Default Renderer: 00000000
>> Enabled: 0
>> Priority: 0
>> Interactor: 0E9418D0
>> Key Press Activation: Off
>> Key Press Activation Value: i
>> Auto Adjust Camera Clipping Range On
>> Pick Color: (1, 0, 0)
>> CurrentRenderer: 00000000
>> Picked Renderer: (none)
>> Current Actor: (none)
>> Interactor: 0E9418D0
>> Prop Picked: No
>> State: 0
>> UseTimers: 0
>> HandleObservers: 1
>> MouseWheelMotionFactor: 1
>> Timer Duration: 10
>> MotionFactor: 10
>>
>>
>> On 04.11.2009, at 18:25, Karthik Krishnan wrote:
>>
>> try to disable the interactor style set on teh interactor
>>
>> interactor->GetInteractorStyle()->EnabledOff()
>>
>> On Wed, Nov 4, 2009 at 10:35 AM, Piotr Byzia
>> <piotr.byzia at gmail.com> wrote:
>>>
>>> Cory and Karthik,
>>>
>>> Thank you for your suggestions.
>>>
>>> By moving, I meant an interaction with a mouse.
>>> Indeed, I have no interaction style defined explicitly, but it
>>> seems that
>>> Python interface has some default one set up, because I was able
>>> to run
>>> this:
>>>
>>> lines_actor.PickableOff()
>>> print lines_actor.GetPickable()
>>> lines_actor.PickableOn()
>>> print lines_actor.GetPickable()
>>> lines_actor.SetPickable(0)
>>> print lines_actor.GetPickable()
>>>
>>> which produced:
>>> 0
>>> 1
>>> 0
>>>
>>> (I apologize if this is something obvious for you, I just started
>>> experimenting with VTK)
>>> So, vtkActor() has an interaction style by default, thus I was
>>> able to
>>> call PickableOff() on it.
>>> However it does not work, while I was able to pick and move around
>>> (rotate) lines_actor with the mouse.
>>>
>>> I had the same issue with lines_actor.DragableOff().
>>>
>>> What is surprising, lines_actor.VisibilityOff() works fine!
>>> (lines_actor
>>> was not visible on the scene)
>>>
>>> Do you possibly have ideas what can interfere with the PickableOff
>>> () ??
>>>
>>> Thanks for any suggestions,
>>> Piotr Byzia
>>>
>>>
>>> On 04.11.2009, at 14:16, Cory Quammen wrote:
>>>
>>>> Hi Piotr,
>>>>
>>>> Perhaps you could clarify what you mean by moving an actor. It
>>>> doesn't
>>>> sound like you have an interactor style that is manipulating the
>>>> actors by picking with the mouse. If you did, however, you could
>>>> call
>>>> PickableOff() on the actor, which will prevent you from picking
>>>> it and
>>>> thereby prevent movement of the actor.
>>>>
>>>> How exactly are you moving the actors now?
>>>>
>>>> Cory
>>>>
>>>> On Wed, Nov 4, 2009 at 7:21 AM, Piotr Byzia <piotr.byzia at gmail.com>
>>>> wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> I want to set an actor to be movable or non-movable, depending on
>>>>> settings
>>>>> which I control through PyQT GUI.
>>>>> In other words, having a few actors on the scene I want to set
>>>>> checkboxes in
>>>>> my GUI that would freeze a given actor, and the rest of them to
>>>>> react as
>>>>> usual to the mouse movements / clicks.
>>>>>
>>>>> Regarding visibility of the actor I'm using
>>>>> GetProperty().SetOpacity(0.0) on
>>>>> an instance of any given actor.
>>>>> I can't see anything related to movement in the GetProperty()
>>>>> properties, I
>>>>> believe it's somewhere else?
>>>>>
>>>>> Here are most important parts of the code I'm using to generate
>>>>> a single
>>>>> actor:
>>>>>
>>>>> self.ren = vtk.vtkRenderer()
>>>>> self.ren.SetBackground(0, 0, 0)
>>>>> self.widget_3d.GetRenderWindow().AddRenderer(self.ren)
>>>>>
>>>>> apd=vtk.vtkAppendPolyData()
>>>>>
>>>>> for i in xrange(len(coordinates)):
>>>>> line=vtk.vtkLineSource()
>>>>>
>>>>> line.SetPoint1(coordinates[i][0]) # 1st atom coordinates for a
>>>>> given
>>>>> bond
>>>>> line.SetPoint2(coordinates[i][1]) # 2nd atom coordinates for a
>>>>> given
>>>>> bond
>>>>> line.SetResolution(21)
>>>>> apd.AddInput(line.GetOutput())
>>>>>
>>>>> mapper = vtk.vtkPolyDataMapper()
>>>>> mapper.SetInput(apd.GetOutput())
>>>>> lines_actor = vtk.vtkActor()
>>>>> lines_actor.SetMapper(mapper)
>>>>> lines_actor.GetProperty().SetColor(0.7, 0.0, 0.0)
>>>>> lines_actor.GetProperty().SetOpacity(1.0)
>>>>>
>>>>> self.ren.AddActor(lines_actor)
>>>>>
>>>>>
>>>>> I found SetCurrentStyleToTrackballActor(), but I want to control
>>>>> this
>>>>> behavior from my GUI.
>>>>> Besides, trackball mode is very inconvenient in my case, with
>>>>> molecules
>>>>> in
>>>>> "lines" representation (it's hard to pick a single line).
>>>>>
>>>>> Thanks,
>>>>> Piotr Byzia
>>>>> _______________________________________________
>>>>> Powered by www.kitware.com
>>>>>
>>>>> Visit other Kitware open-source projects at
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>>>>>
>>>>> Please keep messages on-topic and check the VTK FAQ at:
>>>>> http://www.vtk.org/Wiki/VTK_FAQ
>>>>>
>>>>> Follow this link to subscribe/unsubscribe:
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Cory Quammen
>>>> Center for Computer Integrated Systems for Microscopy and
>>>> Manipulation
>>>> (CISMM)
>>>> Department of Computer Science
>>>> University of North Carolina at Chapel Hill
>>>> http://www.cs.unc.edu/~cquammen
>>>
>>> _______________________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
>>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Please keep messages on-topic and check the VTK FAQ at:
>>> http://www.vtk.org/Wiki/VTK_FAQ
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://www.vtk.org/mailman/listinfo/vtkusers
>>
>>
>>
>>
>
>
>
> --
> Cory Quammen
> Center for Computer Integrated Systems for Microscopy and
> Manipulation (CISMM)
> Department of Computer Science
> University of North Carolina at Chapel Hill
> http://www.cs.unc.edu/~cquammen
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