[vtkusers] Shallow and deep copy

[David Netherway]

Hello Vtk Users,

Would someone be kind enough to explain the difference between shallow and
deep copy.

Particularly with reference to vtkImageData. I have been using shallow copy
on the assumption that it is the lesser operation. If what I am doing does't
work then I would consider a deepcopy. It would be better if I had an
understanding of the difference.

Thanks, David

----- Original Message -----
From: "David Netherway" <david.netherway at adelaide.edu.au>
To: <vtkusers at public.kitware.com>
Sent: Monday, February 18, 2002 12:30 PM
Subject: Re: [vtkusers] Shadow of 2D Actor when using
VolumeRayCastCompositeFunction


> If a "renWin Render" is issued through the vtkInteract console the shadow
> goes away.
>
> I am using vtk4 from about  8th or 9th Feb.
>
> Thanks, David
>
> ----- Original Message -----
> From: "David Netherway" <david.netherway at adelaide.edu.au>
> To: <vtkusers at public.kitware.com>
> Sent: Monday, February 18, 2002 12:03 PM
> Subject: [vtkusers] Shadow of 2D Actor when using
> VolumeRayCastCompositeFunction
>
>
> > Hello Vtk Users,
> >
> > On top of my ray cast image I have inserted a cross using 2D actors. But
I
> > get a shadow offset from the cross. See attached sample code. The shadow
> > does not always appear but if you move the volume a few times (say, 5)
you
> > should see the problem.
> >
> > For ray casting with imbedded geometry there is early termination using
> the
> > z buffer. The problem may be related to an image offset between the z
> buffer
> > and the 2D actor position. I have not yet tracked it down. If you turn
off
> > the early ray termination using
> > volumeMapper SetIntermixIntersectingGeometry 0
> >
> > The problem goes away.
> >
> > Does anyone recognise the problem and have a solution?
> >
> > Thanks, David
> >
> >
>
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