[vtkusers] problem of using vtkPLYReader

[shuang]

Dear all:
    I'm a newcomer of VTK.I have problem of using vtkPLYReader.
    I write a program to read and view the PLY model,but there is something wrong with vtkPLYReader.when I make the project,there is a make error:

    undefined reference to 'vtkPLYReader::New()'

    My code with vtkPLYReader is as follow:

 ...
 #include "vtkPLYReader.h"
 ...
 int main( int argc, char *argv[] )
 {
 ...
 vtkPLYReader *r=vtkPLYReader::New();
 ...
 }

 Can you tell me the reason and how to solve it?

Thanks in advance!

Shuang
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