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</o:shapelayout></xml><![endif]--></head><body lang=DE link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hi all, <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I defined my own mesh class (named <b>Mesh</b>) by inheriting from vtkPolyData. Now I am struggling with the SafeDownCast method in order to cast a vtkPolyData object into a <b>Mesh</b> object. Whenever I am applying a SafeDownCast to a vtkPolyData object, NULL is returned.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The <b>Mesh</b> class looks as follows:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:blue'>class</span><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>Mesh</span><span style='font-size:9.5pt;font-family:Consolas;color:black'> : </span><span style='font-size:9.5pt;font-family:Consolas;color:blue'>public</span><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>vtkPolyData</span><span style='font-size:9.5pt;font-family:Consolas;color:black'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'>{<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:blue'>public</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>:<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:blue'>static</span><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>Mesh</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>* New();<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:#6F008A'>vtkTypeMacro</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>(</span><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>Mesh</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>, </span><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>vtkPolyData</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>);<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:blue'>void</span><span style='font-size:9.5pt;font-family:Consolas;color:black'> PrintSelf(</span><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>ostream</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>& </span><span style='font-size:9.5pt;font-family:Consolas;color:gray'>os</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>, </span><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>vtkIndent</span><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:gray'>indent</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>);<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:blue'>protected</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>:<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> Mesh();<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> ~Mesh();<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:blue'>private</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>:<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> Mesh(</span><span style='font-size:9.5pt;font-family:Consolas;color:blue'>const</span><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>Mesh</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>&); </span><span style='font-size:9.5pt;font-family:Consolas;color:green'>// Not implemented.</span><span style='font-size:9.5pt;font-family:Consolas;color:black'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:blue'>void</span><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:teal'>operator=</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>(</span><span style='font-size:9.5pt;font-family:Consolas;color:blue'>const</span><span style='font-size:9.5pt;font-family:Consolas;color:black'> </span><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>Mesh</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>&); </span><span style='font-size:9.5pt;font-family:Consolas;color:green'>// Not implemented.</span><span style='font-size:9.5pt;font-family:Consolas;color:black'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'> };<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='color:black'>…and this is the cast that does not work properly:<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='color:black'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>Mesh</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>* mesh = </span><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>Mesh</span><span style='font-size:9.5pt;font-family:Consolas;color:black'>::SafeDownCast(<vtkPolyData object>); </span><span style='font-size:9.5pt;font-family:Consolas;color:green'>// mesh always equals NULL<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:green'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='color:black'>Any help would be appreciated. Thanks!<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:black'><o:p> </o:p></span></p><p class=MsoNormal>Best regards<o:p></o:p></p><p class=MsoNormal>Maximilian<o:p></o:p></p></div><div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br /> <table style="border-top: 1px solid #D3D4DE;">
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