After<br>reader1-&gt;SetFileName ( inputFilename.c_str() );<br>try<br>reader1-&gt;Update();<br><br><div class="gmail_quote">On Tue, Oct 18, 2011 at 10:40 AM, andon <span dir="ltr">&lt;<a href="mailto:antoniod987@gmail.com">antoniod987@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Well, the code is quite standard:<br>
<br>
-<br>
-<br>
-<br>
 std::string inputFilename = &quot;../data/bunny.ply&quot;;<br>
<br>
   vtkSmartPointer&lt;vtkPLYReader&gt; reader1 =<br>
    vtkSmartPointer&lt;vtkPLYReader&gt;::New();<br>
  reader1-&gt;SetFileName ( inputFilename.c_str() );<br>
<br>
  // Visualize<br>
  vtkSmartPointer&lt;vtkPolyDataMapper&gt; mapper1 =<br>
    vtkSmartPointer&lt;vtkPolyDataMapper&gt;::New();<br>
  mapper1-&gt;SetInputConnection(reader1-&gt;GetOutputPort());<br>
<br>
  vtkSmartPointer&lt;vtkPolyData&gt; polydata =<br>
vtkSmartPointer&lt;vtkPolyData&gt;::New();<br>
    polydata-&gt;DeepCopy(reader1-&gt;GetOutput());<br>
<br>
vtkDoubleArray* normalDataDouble =<br>
vtkDoubleArray::SafeDownCast(polydata-&gt;GetPointData()-&gt;GetArray(&quot;Normals&quot;));<br>
<br>
  vtkSmartPointer&lt;vtkActor&gt; actor1 =<br>
    vtkSmartPointer&lt;vtkActor&gt;::New();<br>
  actor1-&gt;SetMapper(mapper1);<br>
 //bunny2<br>
   std::string inputFilename2 = &quot;../data/bunny.ply&quot;;<br>
<br>
  vtkSmartPointer&lt;vtkPLYReader&gt; reader2 =<br>
    vtkSmartPointer&lt;vtkPLYReader&gt;::New();<br>
  reader2-&gt;SetFileName ( inputFilename2.c_str() );<br>
<br>
  // Visualize<br>
  vtkSmartPointer&lt;vtkPolyDataMapper&gt; mapper2 =<br>
    vtkSmartPointer&lt;vtkPolyDataMapper&gt;::New();<br>
  mapper2-&gt;SetInputConnection(reader2-&gt;GetOutputPort());<br>
<br>
  vtkSmartPointer&lt;vtkActor&gt; actor2 =<br>
    vtkSmartPointer&lt;vtkActor&gt;::New();<br>
  actor2-&gt;SetMapper(mapper2);<br>
<br>
  // A renderer and render window<br>
  vtkSmartPointer&lt;vtkRenderer&gt; renderer =<br>
    vtkSmartPointer&lt;vtkRenderer&gt;::New();<br>
  vtkSmartPointer&lt;vtkRenderWindow&gt; renderWindow =<br>
    vtkSmartPointer&lt;vtkRenderWindow&gt;::New();<br>
  renderWindow-&gt;AddRenderer(renderer);<br>
<br>
<br>
<br>
   // An interactor<br>
  vtkSmartPointer&lt;vtkRenderWindowInteractor&gt; renderWindowInteractor =<br>
    vtkSmartPointer&lt;vtkRenderWindowInteractor&gt;::New();<br>
<br>
  renderWindowInteractor-&gt;SetRenderWindow(renderWindow);<br>
  actor1-&gt;SetPosition(1,0,0);<br>
  actor2-&gt;SetPosition(1.2,0,0);<br>
  renderer-&gt;AddActor(actor1);<br>
  renderer-&gt;AddActor(actor2);<br>
  renderer-&gt;SetBackground(1,1,1);<br>
<br>
  vtkSmartPointer&lt;vtkInteractorStyleSwitch&gt; style =<br>
vtkSmartPointer&lt;vtkInteractorStyleSwitch&gt;::New();<br>
  renderWindowInteractor-&gt;SetInteractorStyle(style);<br>
-<br>
-<br>
-<br>
The rest of the code is not necessary....I&#39;m trying than I&#39;m using some ply<br>
files from here: <a href="http://graphics.im.ntu.edu.tw/%7Erobin/courses/cg03/model/" target="_blank">http://graphics.im.ntu.edu.tw/~robin/courses/cg03/model/</a><br>
<br>
and i need to extract normals from the actor that i create from the ply<br>
file, in particular in relation with some cells (that i will pick from<br>
cellpicker) , because i have to make some consideration about cells<br>
orientation.....can you help me??? i try to use &quot;polydata&quot; for extract<br>
normals but the array normalsDataDouble that i obtain is not<br>
initialized...if i try to use this array i throw in an exception....<br>
<font color="#888888"><br>
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