[vtk-developers] Mac java not returning zero-initialized objects

[Mark Roden]

I've found what I think is an interesting bug in the Java wrapping.

According to the spec
(http://java.sun.com/docs/books/jls/third_edition/html/typesValues.html#4.12.5),
values in java should be initialized to zero.  However, when I create
a new vtkImageData object, the contents are not zero.

For instance, this method, used to make a mask on top of an existing
vtkImageData object:

public vtkImageData getBlankBinaryData(vtkImageData inImage){
  vtkImageData blankImage = new vtkImageData();
  int [] extent = inImage.GetWholeExtent();
  double[] origin = inImage.GetOrigin();
  double[] spacing = inimage.GetSpacing();
  blankImage.SetExtent(extent);
  blankImage.SetOrigin(origin);
  blankImage.SetSpacing(spacing);
  blankImage.SetScalarTypeToUnsignedChar();
  blankImage.AllocateScalars();
  return blankImage;
}

That above code returns an image that is set to zero on the PC, but
contains a wide variety of values on the mac.

This seems like an oversight in the wrapper.  What should I do to
guarantee that a new vtkImageData contains only zeros?

Thanks,
Mark