<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal style='text-autospace:none'>I am trying to display a 2D image in vtkImageData with an overlay of vtkPolyData. I can get the image to display as intended - setting the extent and using vtkInteractorStyleImage. I can then render the vtkPolyData, which is composed of vtkPoints and vtkTriangles in vtkCellArray. I render the polydata with vtkActor2D and vtkPolyDataMapper2D and add vtkActor to the vtkRenderer that I use to render my image data. The extent of the image data and the coordinates of the polydata are aligned, but they do not display this way. The polydata just seems to be anchored in the lower left of the vtkRenderWindow, and its display does not adjust when I zoom or pan. I am using vtkImageActor and vtkImageActor3D(this is the mapper that is returned when I call ->GetMapper() on the actor) to render the image. Does anyone have any ideas what I might be doing wrong. How can I get the polydata to share the same camera view and extent as the image data?<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'>Thanks,<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>Sean<span style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p></div></body></html>