[vtkusers] question about vtkImageAppend

[Jin Bei]

Hi, 
   I got a problem about vtkImageAppend, I try to read out a list of images 
from png files, then pile them up into a volume by vtkImageAppend, but 
after Update, the output of vtkImageAppend's dimension is right(512, 512, 
246), but all the volume votex scalar is still be 0???? By the way, the 
reader's Output is right. The code is as below, any one know why? Thank 
you!
   for(i=0; i<246; i++)
   {
	 sprintf(filename, "Axial+%03d.00-000.png", i);
	 printf("get %s\n", filename);
	 reader->SetFileName(filename); 
	 reader->Update();
         imageappend->AddInput(reader->GetOutput());
   }
   imageappend->SetAppendAxis(2);
   imageappend->UpdateWholeExtent();
   imageappend->Update();
 
   imageappend->GetOutput()->GetScalarRange(maxmin);
   printf("maxmin: %f, %f\n", maxmin[0], maxmin[1]);   ----> the result is 
0, 0

Bei

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