<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I'm glad it's working, but in your original code you had range1=[1.0,6.0] and generated three contours from that, so the middle value was 3.5<div><br></div><div>-Eric</div><div><br><div><div>On Jul 9, 2010, at 11:08 AM, Jothy wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">Wow!<br><br>It works Eric, I thought x is the number of conotur in GetColor(x,color), but now realized it's the scalar value.<br><br>The values are 1,3,5 (by using ContourFilter->GetValue(0/1/2).<br><br>
Thanks very much,<br><br>Jothy<br><br><br><div class="gmail_quote">On Fri, Jul 9, 2010 at 3:58 PM, Eric E. Monson <span dir="ltr"><<a href="mailto:emonson@cs.duke.edu">emonson@cs.duke.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div style="word-wrap: break-word;">Well, you're requesting the color for a scalar value of 2.0 and your contours are at 1.0, 3.5 and 6.0 -- if you do GetColor(3.5,cc) you get back [0.0, 1.0, 0.0], which is the color of your middle contour, right?<div>
<br></div><div>-Eric</div><div><br><div><div><div></div><div class="h5"><div>On Jul 9, 2010, at 10:50 AM, Jothy wrote:</div><br></div></div><blockquote type="cite"><div><div></div><div class="h5"><div dir="ltr">But this color which translates to (242,255,0) in another RGB format doesn't match with any of the actual contour colors.<br>
<br>See the attached pic.<br><br>Thanks,<br><br>Jothy<br><br><div class="gmail_quote">
On Fri, Jul 9, 2010 at 3:44 PM, Eric E. Monson <span dir="ltr"><<a href="mailto:emonson@cs.duke.edu" target="_blank">emonson@cs.duke.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div style="word-wrap: break-word;">I think I'm just adding two lines to your code and it prints <div><br></div><div><div>[0.94509803921568625, 1.0, 0.0] color</div><div><br></div><div><div><div>import vtk</div>
<div><br></div><div>quadric =vtk.vtkQuadric()</div><div>quadric.SetCoefficients(1,2,3,0,1,0,0,0,0,0);</div><div><br></div><div>sample = vtk.vtkSampleFunction();</div><div>sample.SetSampleDimensions(40,40,40);</div><div>sample.SetImplicitFunction(quadric);</div>
<div><br></div><div>#Generate implicit surface</div><div>contour = vtk.vtkContourFilter();</div><div>contour.SetInput(sample.GetOutput());</div><div>range1=[1.0,6.0]</div><div>contour.GenerateValues(3,range1);</div><div>
<br>
</div><div># The contour lines are mapped to the graphics library.</div><div>contMapper = vtk.vtkPolyDataMapper()</div><div>contMapper.SetInputConnection(contour.GetOutputPort())</div><div>contMapper.SetScalarRange(0,7)</div>
<div><br></div><div>contActor = vtk.vtkActor()</div><div>contActor.SetMapper(contMapper)</div><div><br></div><div>mapr=contMapper.GetLookupTable()</div><div><br></div></div><div># TWO NEW LINES</div><div>mapr.SetRange(0,7)</div>
<div>mapr.Build()</div><div><div><br></div><div>cc=[0,0,0]</div><div>mapr.GetColor(2,cc)</div><div>print cc,'color'</div><div><br></div><div># Create the renderer, render window, and interactor.</div><div>
ren = vtk.vtkRenderer()</div><div>renWin = vtk.vtkRenderWindow()</div><div>renWin.AddRenderer(ren)</div><div>iren = vtk.vtkRenderWindowInteractor()</div><div>iren.SetRenderWindow(renWin)</div><div><br></div><div># Set the background color to white. Associate the actors with the</div>
<div># renderer.</div><div>ren.SetBackground(0,0,0)</div><div>ren.AddActor(contActor)</div><div><br></div><div># Zoom in a little bit.</div><div>ren.ResetCamera()</div><div>ren.GetActiveCamera().Zoom(1)</div><div><br></div>
<div># Initialize and start the event loop.</div><div>iren.Initialize()</div><div>renWin.Render()</div><div>iren.Start()</div></div></div><div><div></div><div><div><br></div><div><br></div><div><div>On Jul 9, 2010, at 10:40 AM, Jothy wrote:</div>
<br><blockquote type="cite"><div dir="ltr">Hi Eric,<br><br>Now I get "None" color<br><br>What's wrong?<br><br>Jothy<br><br><div class="gmail_quote">On Fri, Jul 9, 2010 at 3:20 PM, Eric E. Monson <span dir="ltr"><<a href="mailto:emonson@cs.duke.edu" target="_blank">emonson@cs.duke.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div style="word-wrap: break-word;">Hey Jothy,<div><br></div><div>If you move your GetColor() call after the first Render(), then it will get the correct value. The problem is that at the point you're trying to grab the color from the lookup table it's not really built yet (you can try GetRange() to see that it's still (0,1) when you're calling for the color at 2, for example).</div>
<div><br></div><div>So, you can either grab the color after the Render() call, or explicitly call SetRange(0,7) and then Build() on the LUT before you try to grab the color.</div><div><br></div><div>-Eric</div><div><br><div>
<span style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px;"><div>
------------------------------------------------------</div><div>Eric E Monson</div><div>Duke Visualization Technology Group</div><div><br></div></span></div><br><div><div><div></div><div><div>On Jul 9, 2010, at 7:57 AM, Jothy wrote:</div>
<br></div></div><blockquote type="cite"><div><div></div><div><div dir="ltr">Hi all,<br><br>I am trying to get the color of cntours using Mapper->GetLookupTable()->GetColor(0,color)<br><br>But the color doesn't exactly matches with the actual one!<br>
<br>What the problem in this code?<br>
<br><br><b><span style="color: rgb(51, 102, 255);">import vtk</span><br style="color: rgb(51, 102, 255);"><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">quadric =vtk.vtkQuadric()</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">quadric.SetCoefficients(1,2,3,0,1,0,0,0,0,0);</span><br style="color: rgb(51, 102, 255);"><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">sample = vtk.vtkSampleFunction();</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">sample.SetSampleDimensions(40,40,40);</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">sample.SetImplicitFunction(quadric);</span><br style="color: rgb(51, 102, 255);">
<br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">#Generate implicit surface</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">contour = vtk.vtkContourFilter();</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">contour.SetInput(sample.GetOutput());</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">range1=[1.0,6.0]</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">contour.GenerateValues(3,range1);</span><br style="color: rgb(51, 102, 255);"><br style="color: rgb(51, 102, 255);"><br style="color: rgb(51, 102, 255);"><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);"># The contour lines are mapped to the graphics library.</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">contMapper = vtk.vtkPolyDataMapper()</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">contMapper.SetInputConnection(contour.GetOutputPort())</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">contMapper.SetScalarRange(0,7)</span><br style="color: rgb(51, 102, 255);">
<br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">contActor = vtk.vtkActor()</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">contActor.SetMapper(contMapper)</span><br style="color: rgb(51, 102, 255);">
<br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">mapr=contMapper.GetLookupTable()</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">cc=[0,0,0]</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">mapr.GetColor(2,cc)</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">print cc,'color'</span><br style="color: rgb(51, 102, 255);"><br style="color: rgb(51, 102, 255);">
<br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);"># Create the renderer, render window, and interactor.</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">ren = vtk.vtkRenderer()</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">renWin = vtk.vtkRenderWindow()</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">renWin.AddRenderer(ren)</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">iren = vtk.vtkRenderWindowInteractor()</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">iren.SetRenderWindow(renWin)</span><br style="color: rgb(51, 102, 255);">
<br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);"># Set the background color to white. Associate the actors with the</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);"># renderer.</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">ren.SetBackground(0,0,0)</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">ren.AddActor(contActor)</span><br style="color: rgb(51, 102, 255);"><br style="color: rgb(51, 102, 255);">
<br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);"># Zoom in a little bit.</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">ren.ResetCamera()</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">ren.GetActiveCamera().Zoom(1)</span><br style="color: rgb(51, 102, 255);"><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);"># Initialize and start the event loop.</span><br style="color: rgb(51, 102, 255);">
<span style="color: rgb(51, 102, 255);">iren.Initialize()</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">renWin.Render()</span><br style="color: rgb(51, 102, 255);"><span style="color: rgb(51, 102, 255);">iren.Start()</span></b><br>
<br>Thanks,<br>Jothy<br><br><br></div></div></div><div>
_______________________________________________<br>Powered by <a href="http://www.kitware.com/" target="_blank">www.kitware.com</a><br><br>Visit other Kitware open-source projects at <a href="http://www.kitware.com/opensource/opensource.html" target="_blank">http://www.kitware.com/opensource/opensource.html</a><br>
<br>Please keep messages on-topic and check the VTK FAQ at: <a href="http://www.vtk.org/Wiki/VTK_FAQ" target="_blank">http://www.vtk.org/Wiki/VTK_FAQ</a><br><br>Follow this link to subscribe/unsubscribe:<br><a href="http://www.vtk.org/mailman/listinfo/vtkusers" target="_blank">http://www.vtk.org/mailman/listinfo/vtkusers</a><br>
</div></blockquote></div><br></div></div></blockquote></div><br></div>
</blockquote></div><br></div></div></div></div></blockquote></div><br></div>
</div></div><span><untitled.TIF></span></blockquote></div><br></div></div></blockquote></div><br></div>
</blockquote></div><br></div></body></html>