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<DIV dir=ltr align=left> </DIV>
<DIV><SPAN class=577190907-24112010>Hi</SPAN></DIV>
<DIV><SPAN class=577190907-24112010></SPAN> </DIV>
<DIV><SPAN class=577190907-24112010>I wrote an application where a user can
paint 2d polygons in 3D space. Then the user can define a cutting plane and i
display the resulting lines. </SPAN></DIV>
<DIV><SPAN class=577190907-24112010>The problem is that SOMETIMES the
cutting does not work, so if anyone replys i will send him the Test1.vtk file
which contains 4 Polygons whereby only three are cutted. (Yes the cutting plane
defenetly cuts all polygons and there are 4 Polygons in the input file, see
first visualization).</SPAN></DIV>
<DIV><SPAN class=577190907-24112010></SPAN> </DIV>
<DIV><SPAN class=577190907-24112010>here my code:</SPAN></DIV>
<DIV><SPAN class=577190907-24112010></SPAN> </DIV>
<DIV><SPAN class=577190907-24112010><FONT size=2>
<P>vtkSmartPointer<vtkPolyDataReader> oReader =
vtkPolyDataReader::New();</P>
<P>oReader->SetFileName(</FONT><FONT color=#a31515 size=2><FONT color=#a31515
size=2>"C:\\Test1.vtk"</FONT></FONT><FONT size=2>);</P>
<P>oReader->Update();</P>
<P>vtkSmartPointer<vtkPolyData> oPolyData = oReader->GetOutput();</P>
<P></FONT><FONT color=#008000 size=2><FONT color=#008000 size=2>//Display input
data, not important</P></FONT></FONT><FONT size=2>
<P>{</P>
<P>vtkSmartPointer<vtkPolyDataMapper> oMapper =
vtkPolyDataMapper::New();</P>
<P>oMapper->SetInputConnection(oReader->GetOutputPort());</P>
<P>vtkSmartPointer<vtkActor> oActor = vtkActor::New();</P>
<P>oActor->SetMapper( oMapper );</P>
<P>vtkSmartPointer<vtkRenderer> oRenderer = vtkRenderer::New();</P>
<P>vtkSmartPointer<vtkRenderWindow> oRenderWindow =
vtkRenderWindow::New();</P>
<P>oRenderWindow->AddRenderer(oRenderer);</P>
<P>vtkSmartPointer<vtkRenderWindowInteractor> oIRen =
vtkRenderWindowInteractor::New();</P>
<P>oIRen->SetRenderWindow(oRenderWindow);</P>
<P>oRenderer->AddActor(oActor);</P>
<P></P>
<P></FONT><FONT color=#008000 size=2><FONT color=#008000 size=2>// Render and
interact</P></FONT></FONT><FONT size=2>
<P>oRenderWindow->Render();</P>
<P>oIRen->Initialize();</P>
<P>oIRen->Start();</P>
<P>}</P>
<P>oPolyData->Print(std::cout); </FONT><FONT color=#008000 size=2><FONT
color=#008000 size=2>//containing 4 polygons</P></FONT></FONT><FONT size=2>
<P></FONT><FONT color=#008000 size=2><FONT color=#008000 size=2>//Cut 2D
polygons in 3D space with a plane</P></FONT></FONT><FONT size=2>
<P>vtkSmartPointer<vtkPlane> oPlane = vtkPlane::New();</P>
<P>vtkSmartPointer<vtkCutter> oCutter = vtkCutter::New();</P>
<P>oCutter->SetCutFunction(oPlane);</P>
<P>oCutter->GenerateValues(1,0,1); </FONT><FONT color=#008000 size=2><FONT
color=#008000 size=2>//i am not sure why i do that</P></FONT></FONT><FONT
size=2>
<P>oPlane->SetOrigin(8.5, -72, -1177.0);</P>
<P>oPlane->SetNormal(1,0,0);</P>
<P>oCutter->SetInput(oPolyData);</P>
<P>oCutter->Update();</P>
<P>vtkSmartPointer<vtkPolyData> oCuttedPolyData =
oCutter->GetOutput();</P>
<P></FONT><FONT color=#008000 size=2><FONT color=#008000 size=2>//Display
cutting data, not important </P></FONT></FONT><FONT size=2>
<P>{</P>
<P>vtkSmartPointer<vtkPolyDataMapper> oMapper =
vtkPolyDataMapper::New();</P>
<P>oMapper->SetInputConnection(oCutter->GetOutputPort());</P>
<P>vtkSmartPointer<vtkActor> oActor = vtkActor::New();</P>
<P>oActor->SetMapper( oMapper );</P>
<P>vtkSmartPointer<vtkRenderer> oRenderer = vtkRenderer::New();</P>
<P>vtkSmartPointer<vtkRenderWindow> oRenderWindow =
vtkRenderWindow::New();</P>
<P>oRenderWindow->AddRenderer(oRenderer);</P>
<P>vtkSmartPointer<vtkRenderWindowInteractor> oIRen =
vtkRenderWindowInteractor::New();</P>
<P>oIRen->SetRenderWindow(oRenderWindow);</P>
<P>oRenderer->AddActor(oActor);</P>
<P></P>
<P></FONT><FONT color=#008000 size=2><FONT color=#008000 size=2>// Render and
interact</P></FONT></FONT><FONT size=2>
<P>oRenderWindow->Render();</P>
<P>oIRen->Initialize();</P>
<P>oIRen->Start();</P>
<P>}</P></FONT></SPAN></DIV></BODY></HTML>