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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">I didn’t get an answer last time, so I ask again:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">I have a VTK-based Python application that is used for displaying 3D meshes on top of live video images (Augmented Reality). The application subscribes to an image stream from a camera with help of
the ROS framework. That means, e</span><span lang="EN-US">very time a new image comes in,
<span style="color:black">a callback </span>function <span style="color:black">is triggered
</span>that converts the incoming image data to vtkImageData format via the vtkImageImport class, and then attempt<span style="color:black">s</span> to re-render the scene.<span style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">However, it seems like the Render() function does nothing when called from such a callback function. (I have tried to call Render() both on the vtkRenderWindowInteractor and on the vtkRenderWindow). When I run Render()
from the interactive Python prompt, however, the scene is correctly re-rendered.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So my question is: How can I force the system to re-render the scene from
<span style="color:black">such </span>an (external) callback function? Or how can I otherwise resolve this issue?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#4D5357;mso-fareast-language:ES">--<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#4D5357;mso-fareast-language:ES">Øystein Skotheim<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#4D5357;mso-fareast-language:ES">Senior Researcher<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#4D5357;mso-fareast-language:ES"><br>
TECNALIA</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#4D5357;mso-fareast-language:ES"><br>
Department of Robotics. Industry & Transport Division<o:p></o:p></span></p>
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