<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">hi all;</DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">I have <BR><BR><BR>Assuming that Pi(xi,yi,zi) is a position on the surface of a dataset and Ni(xi,yi,zi) is the normal calculated from the point Pi using the that<BR>dataset, I will calculate 50 samples in the positive direction and 50 samples in the negative direction for each point on the that datasets.I will calculate samples in the positive direction using:<BR>+ direction :P1=Pi+Ni, P2=P1+Ni,P3=P2+Ni...<BR>and in the negative direction using:<BR>- direction: P1=Pi-Ni, P2=P1-Ni, P3=P2-Ni... so on<BR>Assuming that I got the whole sample points.<BR>The grey value for all of these points (P1, P2, P3 ...) will be retrieved<BR>from the raw dataset after doing trilinear interpolation.<FONT size=5><STRONG> could <SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">ProbeFilter able to achieve this? </SPAN></STRONG></FONT></DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><FONT size=5><STRONG><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></STRONG></FONT> </DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><FONT size=5><STRONG><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks alot </SPAN></STRONG></FONT></DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><FONT size=5><STRONG><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Tony</SPAN></STRONG></FONT></DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><FONT size=5><STRONG><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></STRONG></FONT> </DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><FONT size=5><STRONG><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></STRONG></FONT></DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><FONT size=5><STRONG><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></STRONG></FONT>----- Original Message ----<BR>From: Michael Knopke <Michael.Knopke@gmx.de><BR>To: vtkusers@vtk.org<BR>Sent: Tuesday, March 13, 2007 4:08:09 PM<BR>Subject: [vtkusers] 3D .raw data density values<BR><BR></DIV>
<STYLE>
<!--
_filtered {font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
span.E-MailFormatvorlage17
{
font-family:Arial;
color:windowtext;}
_filtered {
margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
{}
_filtered {
}
_filtered {
text-indent:-.25in;
font-family:Arial;
}
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
-->
</STYLE>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=DE style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi Tony,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=DE style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">probing just a point is quite straightforward.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Here is how I do it:</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">- feed Imagedata into vtkImageReslice render it with vtkImageViewer2 (as texture)</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">- create a vtkPointWidget in that window</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">- create polydata (point)</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">- use vtkPointWidget->GetPolyData(point)</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Now connect the ImageData (SetSource) to vtkProbeFilter and the point (SetInput)</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in"><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN>-<FONT face="Times New Roman" size=1><SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></FONT></SPAN></SPAN></FONT><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">now you can query the output for scalardata:</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">ProbeFilter->GetOutput()->->GetPointData()->GetScalars()->GetRange(range,0); //this is the scalardata, there is probably another way to get the value</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in"><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN>-<FONT face="Times New Roman" size=1><SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></FONT></SPAN></SPAN></FONT><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">to define the right position of the point widget use vtkImageActorPointPlacer:</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> image_PointPlacer->SetImageActor(ImageActor);</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> image_PointPlacer->ComputeWorldPosition(Renderer, displayPos, worldPos, worldOrient);</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> point_Widget->SetPosition(worldPos[0],worldPos[1], 1);</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in"><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN>-<FONT face="Times New Roman" size=1><SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></FONT></SPAN></SPAN></FONT><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">now the only thing that you need to do is updating the probe while using the widget: just add an observer for this </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">you can set the interpolation type in the class vtkImageReslice->SetInterpolationTypeTo…</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">If you have problems with this pipeline read the corresponding examples to every involved class first</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Regards</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Michael</SPAN></FONT></P></DIV>
<DIV>_______________________________________________<BR>This is the private VTK discussion list. <BR>Please keep messages on-topic. Check the FAQ at: <A href="http://www.vtk.org/Wiki/VTK_FAQ" target=_blank>http://www.vtk.org/Wiki/VTK_FAQ</A><BR>Follow this link to subscribe/unsubscribe:<BR><A href="http://www.vtk.org/mailman/listinfo/vtkusers" target=_blank>http://www.vtk.org/mailman/listinfo/vtkusers</A></DIV></DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><BR></DIV></div><br>
<hr size=1>Don't pick lemons.<br>
See all the <a href="http://autos.yahoo.com/new_cars.html;_ylc=X3oDMTE0OGRsc3F2BF9TAzk3MTA3MDc2BHNlYwNtYWlsdGFncwRzbGsDbmV3Y2Fycw--">new 2007 cars</a> at <a href="http://autos.yahoo.com/new_cars.html;_ylc=X3oDMTE0OGRsc3F2BF9TAzk3MTA3MDc2BHNlYwNtYWlsdGFncwRzbGsDbmV3Y2Fycw--">Yahoo! Autos.</a></body></html>