Hi all,<br><br>I am rendering a Ct image using vtkRenderer, now I want to add a circle over the image. Suppose if I set the radius of the circle to 5cm it should cover 5cm on the image as well.<br><br>How to seup the coordinate system properly?<br>
<br>I tried using Renderer.ViewToWorld(), my app hangs!<br><br>Thanks<br><br>Jothy<br>