[vtkusers] How to get a reference to a picked actor

[Sercani]

Hi John;

Check out this code:

vtkPropPicker *picker=vtkPropPicker::New();

picker->Pick(point.x, point.y,0.0,renderer); /*this point coordinates must
be in display coordinates!!!renderer is your renderer that contains these
actors..*/

picker->GetActor(); //this is your pointer to picked actor.You can also
write this:  vtkActor *actor=vtkActor::New();actor=picker->GetActor();

 

I recommend using vtkPropPicker instead of vtkPicker because PropPicker is
extremely fast.

 

From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On Behalf
Of John Eke
Sent: Thursday, August 14, 2008 7:28 PM
To: vtkusers at vtk.org
Subject: [vtkusers] How to get a reference to a picked actor

 

Hi,

I have a bit of code where I create a pointer to vtkActor, then add it to a
Renderer. After that I set the pointer to NULL so I have no reference to it
anymore. Say I have several of such actors within the same Renderer, how can
I perform a pick, and get back a reference to the picked actor?

All this is being done within my subclass of vtkInteractorStyle.
OnMouseMove, I draw an actor, and add it to the renderer. OnLeftButtonDown I
perform a pick on any of the actors drawn. If someone could please point me
in the right direction, I will be very greatful. I just need to know how to
get a pointer to an actor once a pick is performed.

Thanks

 

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