<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">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>
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------------------------------------------------------</div><div>Eric E Monson</div><div>Duke Visualization Technology Group</div><div><br></div></span></div><br><div><div><div></div><div class="h5"><div>On Jul 9, 2010, at 7:57 AM, Jothy wrote:</div>
<br></div></div><blockquote type="cite"><div><div></div><div class="h5"><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 class="im">
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