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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Ah that explains my Problem </span><span style='font-size:11.0pt;
font-family:Wingdings;color:#1F497D'>J</span><span lang=EN-US style='font-size:
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>First: Right I meant test2[0].<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Second: Today I realized that the missing component is in test2[-1].
<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>So the Offset explains why the pointer is set to a wrong place
;)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks </span><span lang=EN-US style='font-size:11.0pt;
font-family:Wingdings;color:#1F497D'>J</span><span lang=EN-US style='font-size:
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Von:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Karthik Krishnan
[mailto:karthik.krishnan@kitware.com] <br>
<b>Gesendet:</b> Dienstag, 21. </span><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>September 2010 11:22<br>
<b>An:</b> Martin Ulken<br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Betreff:</b> Re: [vtkusers] Loosing first Compontent after SafeDownCast<o:p></o:p></span></p>
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<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US><o:p> </o:p></span></p>
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<p class=MsoNormal>On Tue, Sep 21, 2010 at 1:43 PM, Martin Ulken <<a
href="mailto:martinulken@googlemail.com">martinulken@googlemail.com</a>>
wrote:<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Hello</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>I am going to import an bmp image by using the vtkBMPReader which
works fine.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>When I am going to access the pixels of the image using “
image2->GetScalarComponentAsFloat(x,y,0,0) “ everything works fine.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>When I display the first greyvalues in row y=0 I get the
following: 21,36,58,63,… which is correct.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Now I want to have a faster access… so I create a pointer with
the following commands:</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>vtkUnsignedCharArray* test= vtkUnsignedCharArray::SafeDownCast(image2->GetPointData()->GetScalars());</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>test2= test->GetPointer(VTK_UNSIGNED_CHAR);</span><o:p></o:p></p>
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<p class=MsoNormal><br>
What do you mean by test->GetPointer(VTK_UNSIGNED_CHAR) ? The value to be
passed in is simply the offset. Perhaps you meant to write
test->GetPointer(0);<br>
<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-US>Now the value of test[0] is 36. So I cannot access the first column
of the image.</span><o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
You mean test2[0] ?<span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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