<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><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.hoenzb
{mso-style-name:hoenzb;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks for the info… the Interaction/Point Picker (need to do this in my vtkvolume that is using the SetRepresentationToPoints() method) seems to produce some results. However, not sure what’s going on. I have a totally black image with a small white box in the center of the image. I can pick points outside of the white box. From the description of the point picker, I was thinking that it would only interact with any points on the white box, not my black area of the image.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>More investigation to do.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Doug<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> David Doria [mailto:daviddoria@gmail.com] <br><b>Sent:</b> Friday, February 03, 2012 11:38 AM<br><b>To:</b> Doug Hoppes<br><b>Cc:</b> vtkusers@vtk.org<br><b>Subject:</b> Re: [vtkusers] SetRepresentationToPoints and picking the points<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Fri, Feb 3, 2012 at 11:32 AM, Doug Hoppes <<a href="mailto:dhoppes@mbfbioscience.com">dhoppes@mbfbioscience.com</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi all,<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> Hopefully this is a simple question. I have an image that I represent on the screen as points (using SetRepresentationToPoints()). I would like the user to be able to select one of those points. I was thinking that I could use the vtkPointPicker, but nothing seems to be ever selected. <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> Any idea what class/example would do the trick?<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='color:#888888'> <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='color:#888888'>Doug<o:p></o:p></span></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>If you have a 2D image, you can pick directly on the image without having to represent it as points:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/PickingAPixel">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/PickingAPixel</a><o:p></o:p></p><div><p class=MsoNormal><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/PickingAPixel2">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/PickingAPixel2</a><br clear=all><br>Otherwise I think you'll want something like this:<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/PointPicker">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/PointPicker</a><o:p></o:p></p></div><div><p class=MsoNormal>David <o:p></o:p></p></div></div></div></div></body></html>