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<DIV dir=ltr align=left><SPAN class=342411211-24112010>Also the
3D rendering of a normal polygon seems to be strange, is there an
error in the triangulation (compare surface mode (button s) and wireframe mode
(button w)), here my example polygons</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=342411211-24112010>
<DIV dir=ltr align=left><SPAN class=830245110-24112010></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010>Without spikes:</SPAN></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010></SPAN></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010># vtk DataFile Version
3.0<BR>vtk output<BR>ASCII<BR>DATASET POLYDATA<BR>POINTS 7 float<BR>0 0 0 100 0
0 100 50 0 <BR>150 50 0 90 60 0 100 100 0<BR>0 100 0<BR>POLYGONS 1 8<BR>7 0 1 2
3 4 5 6 </SPAN></DIV>
<DIV> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>CELL_DATA 1<BR>SCALARS
scalars double 3<BR>LOOKUP_TABLE default<BR>1 0 0 <SPAN
class=342411211-24112010> </SPAN></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010></SPAN></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010></SPAN></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010>With spikes:</SPAN></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010></SPAN></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010># vtk DataFile Version
3.0<BR>vtk output<BR>ASCII<BR>DATASET POLYDATA<BR>POINTS 7 float<BR>0 0 0 100 0
0 100 50 0 <BR>150 50 0 90 <SPAN class=342411211-24112010>5</SPAN>0 0 100
100 0<BR>0 100 0<BR>POLYGONS 1 8<BR>7 0 1 2 3 4 5 6 </SPAN></DIV>
<DIV> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>CELL_DATA 1<BR>SCALARS
scalars double 3<BR>LOOKUP_TABLE default<BR>1 0 0 <SPAN
class=342411211-24112010> </SPAN></SPAN></DIV></SPAN></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010> </SPAN></SPAN></SPAN><SPAN
class=342411211-24112010></SPAN><SPAN class=830245110-24112010><SPAN
class=342411211-24112010> </SPAN></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010></SPAN></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010>Take </SPAN></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010>
<P>oPlane->SetOrigin(50, 50, 0);</P>
<P>oPlane->SetNormal(1,0,0);<SPAN class=342411211-24112010> </SPAN></P>
<P><SPAN class=342411211-24112010></SPAN> </P>
<P><SPAN class=342411211-24112010>as cutting plane for my example
program</SPAN></P>
<P><SPAN class=342411211-24112010></SPAN> </P>
<P><SPAN class=342411211-24112010>best
regards </SPAN></P></SPAN></SPAN></DIV></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010></SPAN></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010></SPAN></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010><SPAN
class=342411211-24112010> </SPAN>Ok</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010> i figured out in
which case the cutter does not work, and i think it is a bug:</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>Working
Polygon:</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(0 0 0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(10 0 0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(10 10
0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(0 10 0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>This Polygon is cut
correct. And this is not cut correct:</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(0 0 0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(10 0 0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(10 5 0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(15 5 0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(10 5 0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(10 10 0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>(0 10 0)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>You can see that in my
second case the boundary has an infinite small spike. This results in an empty
cutting result. In my opinion this is a valid polygon so the cutting should be
calculated...</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010>Can anyone make a bug
report? I do not know why i cannot go the bug report system today (or is it
offline?)</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=830245110-24112010></SPAN> </DIV><BR>
<DIV dir=ltr lang=de class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT face=Tahoma><B>Von:</B> vtk-developers-bounces@vtk.org
[mailto:vtk-developers-bounces@vtk.org] <B>Im Auftrag von </B>Lodron,
Gerald<BR><B>Gesendet:</B> Mittwoch, 24. November 2010 09:30<BR><B>An:</B>
'vtk-developers@vtk.org'<BR><B>Betreff:</B> [vtk-developers] WG: Problems
cutting polygons, bug?<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr align=left> </DIV><SPAN
class=294192908-24112010></SPAN>and here the single polygon <SPAN
class=294192908-24112010>extracted
</SPAN>which cannot be cutted<SPAN
class=294192908-24112010></SPAN><BR>
<DIV dir=ltr lang=de class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT face=Tahoma><B>Von:</B> vtk-developers-bounces@vtk.org
[mailto:vtk-developers-bounces@vtk.org] <B>Im Auftrag von </B>Lodron,
Gerald<BR><B>Gesendet:</B> Mittwoch, 24. November 2010 08:32<BR><B>An:</B>
'vtk-developers@vtk.org'; 'vtkusers@vtk.org'<BR><B>Betreff:</B> [vtk-developers]
WG: Problems cutting polygons, bug?<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr align=left> </DIV>
<DIV><SPAN
class=754463007-24112010></SPAN>ok, there is the vtk polydata file, i hope that i come through the filter<SPAN
class=754463007-24112010> otherwise noone will read thsi :-)</SPAN></DIV>
<DIV> </DIV>
<DIV><SPAN class=754463007-24112010></SPAN><BR> </DIV>
<DIV dir=ltr lang=de class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT face=Tahoma><B>Von:</B> vtkusers-bounces@vtk.org
[mailto:vtkusers-bounces@vtk.org] <B>Im Auftrag von </B>Lodron,
Gerald<BR><B>Gesendet:</B> Mittwoch, 24. November 2010 08:23<BR><B>An:</B>
'vtkusers@vtk.org'<BR><B>Betreff:</B> [vtkusers] Problems cutting polygons,
bug?<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV> </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>
<P>vtkSmartPointer<vtkPolyDataReader> oReader =
vtkPolyDataReader::New();</P>
<P>oReader->SetFileName(<FONT color=#a31515><FONT
color=#a31515>"C:\\Test1.vtk"</FONT></FONT>);</P>
<P>oReader->Update();</P>
<P>vtkSmartPointer<vtkPolyData> oPolyData = oReader->GetOutput();</P>
<P><FONT color=#008000><FONT color=#008000>//Display input data, not
important</P></FONT></FONT>
<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 color=#008000><FONT color=#008000>// Render and
interact</P></FONT></FONT>
<P>oRenderWindow->Render();</P>
<P>oIRen->Initialize();</P>
<P>oIRen->Start();</P>
<P>}</P>
<P>oPolyData->Print(std::cout); <FONT color=#008000><FONT
color=#008000>//containing 4 polygons</P></FONT></FONT>
<P><FONT color=#008000><FONT color=#008000>//Cut 2D polygons in 3D space with a
plane</P></FONT></FONT>
<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 color=#008000><FONT
color=#008000>//i am not sure why i do that</P></FONT></FONT>
<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 color=#008000><FONT color=#008000>//Display cutting data, not important
</P></FONT></FONT>
<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 color=#008000><FONT color=#008000>// Render and
interact</P></FONT></FONT>
<P>oRenderWindow->Render();</P>
<P>oIRen->Initialize();</P>
<P>oIRen->Start();</P>
<P>}</P></SPAN></DIV></BODY></HTML>