[vtkusers] Read RAW datas with vtkImageData?

[x0_y0_0]

hi,evryone,
   I want to use vtkImageData read a raw datasets 256*256*256, and I followed an example from the internet.  I reconstruct the datasets,but it shows part of the 3D reconstruction. Could anyone help me? thanks.
 
code:
     unsigned short *buf;
     buf = new unsigned short[256*256*117];
     unsigned short *p=buf;
     FILE *fp = fopen( filePath,"r"); 
     fread(buf,256*256,117,fp);
     fclose(fp);

    vtkImageData* id = vtkImageData::New();
     id->SetDimensions(256, 256, 117); 
  // id ->GetPointData()->SetScalars(array) ;
     id->SetSpacing(1.0,1.0,1.0);
     id->SetOrigin(0.0,0.0,0.0);
      id->SetScalarTypeToUnsignedShort(); 
      id->SetNumberOfScalarComponents(1); 
       id->AllocateScalars(); 

      unsigned  short* a = (unsigned short*)(id->GetScalarPointer()); 
                for (i = 0; i < dims[2]; i++) 
                { 
                    for (j = 0; j < dims[1]; j++) 
                    { 
                        for (k = 0; k < dims[0]; k++) 
                        { 
                            *a = *p;   a++;  p++;
                        } 
                    } 
                } 

 
 
 
                                                                                                        mexiao
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