well as* CopyAllocate() (or PassThrough()) later on.  This meant that
subsequent filters saw 2 (two) arrays, one unnamed and empty, the other
representing the real data.  The unnamed array was able to crash
at least the vtkStructuredPointsWriter and any of the vtkXMLWriters.

1.) vtkTypeRevisionMacro is now used in all VTK classes in place of
    vtkTypeMacro.  It invokes the original vtkTypeMacro and then adds
    a protected CollectRevisions method for future use in serialization.
    A corresponding vtkCxxRevisionMacro has been added to every .cxx file
    to implement the CollectRevisions method for each class.  This will
    allow collection of every class revision at run time.  Any new VTK class
    should use vtkTypeRevisionMacro instead of vtkTypeMacro.  The .cxx
    implementation should then have the following line:
      vtkCxxRevisionMacro(vtkFoo, "$Revision: 1.1 $");
    CVS should insert the correct revision number when the class is commited.

2.) vtkTypeMacro now also adds a typedef called "Superclass" to refer to
    the superclass of any VTK class.  All PrintSelf methods have been
    updated to call their superclass's PrintSelf like this:
      this->Superclass::PrintSelf(os,indent);
    This should reduce the number of places that refer to a superclass
    by its actual name.

3.) The standard ::New() method implementation has been replaced with a
    macro.  Instead of an explicitly written implementation to try the
    object factory and then call the new operator, VTK classes should
    instead use the following macro unless they have a special New() method:
      vtkStandardNewMacro(vtkFoo);
    This will implement the New() method in the standard way.  The line
    should appear in the .cxx implementation file, not in the header.
    Using the macro will make it easier to change the standard
    implementation of the method.

Also removed tabs from many files.

A new CVS repository was created on 2001-04-26 to fork VTK during
transition to a new source tree layout.  The new repository was created
using server-side symlinks referencing files in the original repository
to preserve per-file history.  This commit was manufactured during
conversion from CVS to represent the fork as a branch.

the output.

The filters vtkExtractVOI and vtkExtractGrid appear to
lose cell data. This is illustrated by the attached
sample code. A structured points data set is created
with point and cell data (scalars). After filtering with
vtkExtractVOI, there are point scalars but no cell
scalars. The same thing happens for a structured grid
data set that is extracted by vtkExtractGrid (sample
code not attached).

As always, many thanks for you help and best regards,
Paul

evenly divide VOI.