[vtkusers] Shadow of 2D Actor when using VolumeRayCastCompositeFunction

[David Netherway]

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
>
>