[vtkusers] Determining vtkActors from point in space

[Robbie Banks]

OK, 

Note for all.

Here is how to convert from a point in your model to a point in the viewport
to select an Actor.


	vtkSmartPointer<vtkPropPicker> pPicker =
vtkSmartPointer<vtkPropPicker>::New();
	double x = location.at(0);
	double y = location.at(1);
	double z = location.at(2);
	vtkSmartPointer<vtkCoordinate> pCoord =
vtkSmartPointer<vtkCoordinate>::New();
	pCoord->SetCoordinateSystemToWorld();
	pCoord->SetValue(x,y,z);
	int * View = pCoord->GetComputedDisplayValue(pRenderer);
	pPicker->Pick(View[0],View[1],0,pRenderer);
	vtkSmartPointer<vtkActor> pPickedActor = pPicker->GetActor();
	pPickedActor->GetProperty()->SetOpacity(opacity);


where location is a QList<double>.

Cheers
Robbie

-----Original Message-----
From: daviddoria at gmail.com [mailto:daviddoria at gmail.com] On Behalf Of David
Doria
Sent: Tuesday, March 30, 2010 2:53 PM
Cc: Robbie Banks; vtkusers at vtk.org
Subject: Re: [vtkusers] Determining vtkActors from point in space

On Tue, Mar 30, 2010 at 5:17 PM, David E DeMarle
<dave.demarle at kitware.com> wrote:
> Make a vtkPicker instead of the Abstract class, then call the
> vtkPicker::GeActors() to get a list of all the actors that are
> underneath the pixel.
>
> David E DeMarle

Robbie,

Here is an example:
http://www.vtk.org/Wiki/VTK/Examples/Interaction/SelectAnActor

Thanks,

David