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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">For correct transparent blending, add a vtkDepthSortPolyDataFilter (or whatever it’s called). Just before the mapper, it needs the camera to be set so that
it can get the correct distance order of each polygon.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">JB<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> vtkusers-bounces@vtk.org [mailto:vtkusers-bounces@vtk.org]
<b>On Behalf Of </b>max perlman<br>
<b>Sent:</b> 22 May 2013 08:20<br>
<b>To:</b> vtkusers@vtk.org<br>
<b>Subject:</b> [vtkusers] Mesh Opacity<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
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<pre style="margin-left:36.0pt"><span style="color:black">Dear VTKers,<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">I want to show a mesh(that i read from an obj file using vtkobjreader) and when i reduce opacity, not to see the triangles from which it is made.<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">How can i achieve this?<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">Part of the code:<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> reader = vtkOBJReader.New();<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> reader.SetFileName(filePath);<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> reader.Update();</span><o:p></o:p></pre>
<pre style="margin-left:36.0pt"><o:p> </o:p></pre>
<pre style="margin-left:36.0pt"><span style="color:black">vtkPolyDataNormals boneNormals = new vtkPolyDataNormals();<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">boneNormals.SetInputConnection(reader.GetOutputPort());<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">boneNormals.SetFeatureAngle(60.0);</span><o:p></o:p></pre>
<pre style="margin-left:36.0pt"><span style="color:black">vtkPolyDataMapper mapper1 = vtkPolyDataMapper.New();<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">mapper1.SetInputConnection(boneNormals.GetOutputPort());<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"><o:p> </o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">actor1 = vtkActor.New();<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">actor1.SetMapper(mapper1);<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"><o:p> </o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">renderWindow = renderWindowControl1.RenderWindow;<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">// set background color<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">renderer.SetBackground(0.5, 0.5, 0.5);<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"><o:p> </o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">renderer.AddActor(actor1);<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"><o:p> </o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">renderer.ResetCamera();<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black">renderWindow.Render();</span><o:p></o:p></pre>
<pre style="margin-left:36.0pt"><o:p> </o:p></pre>
<pre style="margin-left:36.0pt"><o:p> </o:p></pre>
<pre style="margin-left:36.0pt"><span style="color:black">private void button8_Click(object sender, EventArgs e)<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> {<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> if (j > 0)<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> {<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> j -= 0.1;<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> actor1.GetProperty().SetOpacity(j);<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> renderWindow.Render();<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> }<o:p></o:p></span></pre>
<pre style="margin-left:36.0pt"><span style="color:black"> }</span><o:p></o:p></pre>
<pre style="margin-left:36.0pt"><o:p> </o:p></pre>
<pre style="margin-left:36.0pt"><span style="color:black">Thank you,</span><o:p></o:p></pre>
<pre style="margin-left:36.0pt"><span style="color:black">Max</span><o:p></o:p></pre>
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