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<p class="MsoNormal"><span lang="EN-US">Hello. I am working on a Python application where I want to display 3D meshes on top of live video images. I have currently implemented this by using a vtkImageActor (with the image) along with a normal vtkActor (with
the 3D data). Perhaps this is not the correct way of doing it, but it seems to work fine.<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">The application is developed within the ROS framework, and I receive images by subscribing to image messages on a ROS topic. This means that every time a new image comes in, I have a ROS callback function that converts
the incoming image data to vtkImageData format via the vtkImageImport class, and then I attempt to re-render the scene.<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">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 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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