<div>You can fire a pick event when the user clicks the mouse:</div>
<div> </div>
<div> Picker->Pick(eventpos[0], eventpos[1], 0, renderer);</div>
<div> </div>
<div>Then you can get the mapped position:</div>
<div> </div>
<div> Picker->GetMapperPosition(...);</div>
<div> </div>
<div>Then the final x,y locs of the original image I get by:</div>
<div> </div>
<div> originalX = (int)(ptMapped[0] / pixel_spacing_x + 0.5);</div>
<div> // same for y.</div>
<div> </div>
<div>This always has given me the correct 'real' location.</div>
<div> </div>
<div>Mark<br><br> </div>
<div><span class="gmail_quote">On 10/5/05, <b class="gmail_sendername">Renaud Isabelle</b> <<a href="mailto:renauisa@yahoo.fr">renauisa@yahoo.fr</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>Hi all,</div>
<div> </div>
<div>I have read an initial 3D image from a file with itkImageFileReader and displayed with VTK through vtkImageData/vtkImageActor.</div>
<div> </div>
<div>Now, since a known world position in 3D x,y,z, I would like to retrieve the pixel value at this point of my image. </div>
<div> </div>
<div>This seems to be a complex problem, because I don't want the pixel data that is displayed at this position but the pixel data of the raw image, that is no rescaled instead.</div>
<div> </div>
<div>Is there some example where such a thing is done? Or any function? </div>
<div> </div>
<div>Thanks, </div><span class="sg">
<div> </div>
<div>Isabelle</div></span><span class="ad">
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<p>
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