[vtkusers] About reading PLY

[hbfyf]

I have succeed in reading PLY file.But if I open a big ply file such as 2M size,it can't work and saying unable to allocate such elements of size.How to solve this problem?
  
 Thanks!
  
 I use the following code to read ply.
  
   vtkSmartPointer<vtkPLYReader> reader =
    vtkSmartPointer<vtkPLYReader>::New();
  reader->SetFileName ( inputFilename.c_str() );
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