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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Check out this tutorial:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>http://vtkblog.blogspot.com/2007/06/point-and-line-plotter-in-vtk-simple.html<o:p></o:p></span></p>
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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"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Konstantinos Kelg
[mailto:kkelgeor@yahoo.gr] <br>
<b>Sent:</b> Tuesday, January 20, 2009 5:45 PM<br>
<b>To:</b> Andre Gouws; Sercani; vtkusers@vtk.org<br>
<b>Subject:</b> RE: [vtkusers] Help with drawing lines<o:p></o:p></span></p>
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<p>Actually, the lines I have to draw are too many (more than 100.000). So I
don't think drawing each line with a different actor would be a good idea.
Isn't there any way to define all the lines in a single object and then
render them with one actor ?<o:p></o:p></p>
<p>I thought that "vtkCellArray" would do the job, but I guess I
was wrong. Perhaps I'm missing sth...<o:p></o:p></p>
<p class=MsoNormal><br>
--- Στις <b>Δευτ., 19/01/09, ο/η Andre Gouws <i><andre@ynic.york.ac.uk></i></b>
έγραψε:<o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Από: Andre Gouws
<andre@ynic.york.ac.uk><br>
Θέμα: Re: [vtkusers] vtkAVIWriter problem.<br>
Προς: kkelgeor@yahoo.gr<br>
Κοιν.: vtkusers@vtk.org<br>
Ημερομηνία: Δευτέρα, 19 Ιανουάριος 2009, 9:44<o:p></o:p></p>
<pre>I usually<o:p></o:p></pre><pre> just use vtkLineSource (has SetPoint1 and SetPoint2 calls once you<o:p></o:p></pre><pre>have calculated the positions) .. example from the vtk source (Python sorry)<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>rake = vtk.vtkLineSource()<o:p></o:p></pre><pre>rake.SetPoint1(15, -5, 32)<o:p></o:p></pre><pre>rake.SetPoint2(15, 5, 32)<o:p></o:p></pre><pre>rake.SetResolution(21)<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>..... addmapper ...<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>..... addactor ... etc.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>> This is the private VTK discussion list.<o:p></o:p></pre><pre>> Please keep messages on-topic. Check the FAQ at:<o:p></o:p></pre><pre>http://www.vtk.org/Wiki/VTK_FAQ<o:p></o:p></pre><pre>> Follow this link to subscribe/unsubscribe:<o:p></o:p></pre><pre>> http://www.vtk.org/mailman/listinfo/vtkusers<o:p></o:p></pre><pre>> <br>
i think vtkLineRepresentation (or vtkLinewidget) is a better way to draw lines in a scene…you must set the properties of the line the way you like, add it to the renderer and simply set the coordinates(in world coordinates) of two end points of the line …<br>
<br>
====================================================<br>
<br>
Hi. I need to render some vectors in 3D space and I've decided to draw them as lines. However my code doesn't seem to work (I see nothing). Does anyone know why ?<br>
<br>
<br>
vtkCellArray *cellArrayNorm = vtkCellArray::New();<br>
vtkPoints *points2 = vtkPoints::New();<br>
points2->Allocate(2*m_NumOfVertices*3*sizeof(float));<br>
<br>
<br>
for(int k=0; k<m_NumOfVertices; k++)<br>
{<br>
float* fp = VerticesP[k].coords; // Get vertex coords.<br>
<br>
float* fpN = NormP[k].coords; // Get vertex normal.<br>
points2->SetPoint(k, fp); // Set 1st point<br>
points2->SetPoint(m_NumOfVertices + k, // Set 2nd point.<br>
<o:p></o:p></pre><pre style='margin-bottom:12.0pt'> fp[0]+fpN[0], // x+dx<br>
fp[1]+fpN[1], // y+dy<br>
fp[2]+fpN[2]);// z+dz<br>
// Set up new (line) cell and insert.<br>
int pts[2] = {k, m_NumOfVertices+k};<br>
cellArrayNorm->InsertNextCell(2, pts);<br>
}<br>
<br>
<br>
<br>
vtkPolyData *polyDataNorm = vtkPolyData::New();<br>
polyDataNorm->SetPoints(points2);<br>
polyDataNorm->SetPolys(cellArrayNorm);<br>
<br>
vtkPolyDataMapper *polyDataMapperNorm = vtkPolyDataMapper::New();<br>
polyDataMapperNorm->SetInput(polyDataNorm);<br>
<br>
ActorNorm->SetMapper(polyDataMapperNorm);<br>
ren1->AddActor(ActorNorm);<br>
<br>
vtkProperty *prop = vtkProperty::New();<br>
prop->SetColor(1.0, 0.0, 0.0);<br>
ActorNorm->SetProperty(prop);<br>
<br>
points2->Delete();<br>
cellArrayNorm->Delete();<br>
polyDataNorm->Delete();<br>
polyDataMapperNorm->Delete();<br>
prop->Delete();<br>
<br>
Thanks.<o:p></o:p></pre></div>
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