<meta http-equiv="content-type" content="text/html; charset=utf-8"><div class="gmail_quote">On Sun, Aug 22, 2010 at 1:46 AM, XuXing <span dir="ltr"><<a href="mailto:cool2201@sina.com">cool2201@sina.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div lang="ZH-CN" link="blue" vlink="purple"><div><p class="MsoNormal"><span lang="EN-US">Hi all</span></p><p class="MsoNormal" style="text-indent:21.0pt">
<span lang="EN-US">I want to convert the vtkPolyData to vtkImageData, I have used the vtkPolydataToImageStencil to do the job, but it didn’t work, maybe there is some error in my code</span></p><p class="MsoNormal"><span lang="EN-US">My purpose is to draw a line on the top of an image, so I used vtkImageBlend and vtkImageCanvasSource2D to finish it. Any advice will be appreciated, thanks.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p><font color="#888888"><p class="MsoNormal"><span lang="EN-US"> </span></p><p class="MsoNormal"><span lang="EN-US">XuXing</span></p><p class="MsoNormal"><span lang="EN-US"><br>
</span></p></font></div></div></blockquote><div><br></div><div>I don't understand what converting a polydata to an imagedata has to do with drawing on an image? If you want to do that, you'll have to snap the points to a grid first:</div>
<div><br></div><div><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/QuantizePolyDataPoints">http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/QuantizePolyDataPoints</a></div><div><br></div><div>You can draw on an image like this: </div>
<a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/ImageTracerWidget">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/ImageTracerWidget</a></div><div class="gmail_quote"><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/ImageTracerWidget"></a>(ignore the picture of sphere - I'll update it later today)</div>
<div class="gmail_quote"><br></div><div class="gmail_quote">Good luck,</div><div class="gmail_quote"><br><div>David </div></div><br>