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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'>When I set all opacity points to 0.0, nothing changes at
all.<span style='mso-spacerun:yes'> </span>I kind of gave up getting
opacity to work this way.<span style='mso-spacerun:yes'> </span>Instead,
I’m using the <span class=SpellE>SetOpacity</span> function, i.e. <span
class=SpellE><span class=GramE>actor.SetOpacity</span></span><span class=GramE>(</span><span
class=SpellE>some_number</span>).<span style='mso-spacerun:yes'>
</span>For my <span class=SpellE>isosurface</span>, this seems to work,
although I would have liked to get it working for my volumes (maximum intensity
projection…).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> vtkusers-admin@vtk.org
[mailto:vtkusers-admin@vtk.org] <b><span style='font-weight:bold'>On Behalf Of </span></b>anast.jm@pg.com<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, June 19, 2003 5:17
PM<br>
<b><span style='font-weight:bold'>To:</span></b> vtkusers@public.kitware.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> [vtkusers] Re: Opacity
problems with vtkVolume</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'>Sorry for the resend....realized the subject line
wasn't too descriptive in the original post...john</span></font> <br>
<br>
<font size=1 color=purple face=sans-serif><span style='font-size:7.5pt;
font-family:sans-serif;color:purple'>----- Forwarded by John Anast on
06/19/2003 05:15 PM -----</span></font> <br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>I'm
on WinXP with vtk 4.2 from a recent CVS build. I'm not seeing this problem. I
have a small tcl script that compares side by side the RayCast Mapper and
VolumePro mapper on the poship volume dataset and the opacity it behaving
properly for both mappers. What does your volume look like after setting all
opacity points to 0.0?? ...john</span></font> <br>
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font-weight:bold'>public.kitware.com [24.97.130.19]</span></font></b> <o:p></o:p></p>
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<p class=MsoNormal><b><font size=1 face=sans-serif><span style='font-size:
7.5pt;font-family:sans-serif;font-weight:bold'>"Nico Vermaas"
<vermaas@astron.nl></span></font></b> <br>
<font size=1 face=sans-serif><span style='font-size:7.5pt;font-family:sans-serif'>Sent
by: vtkusers-admin@www.vtk.org</span></font> <o:p></o:p></p>
<p><font size=1 face=sans-serif><span style='font-size:7.5pt;font-family:
sans-serif'>06/19/2003 02:28 AM</span></font> <o:p></o:p></p>
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font-family:Arial'> </span></font><br>
<font size=1 face=sans-serif><span style='font-size:7.5pt;font-family:sans-serif'>
To: <vtkusers@public.kitware.com></span></font>
<br>
<font size=1 face=sans-serif><span style='font-size:7.5pt;font-family:sans-serif'>
cc: <dsjen@cs.unc.edu>,
(bcc: John Anast-JM/PGI)</span></font> <br>
<font size=1 face=sans-serif><span style='font-size:7.5pt;font-family:sans-serif'>
Subject: [vtkusers] Re:
vtkusers digest, Vol 1 #1884 - 11 msgs</span></font><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
<br>
<br>
</span></font><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>Hi Dennis,<br>
<br>
I have exactly the same problem with 4.x on Linux (Suse 7.3), if you find a
solution let me know. Will do the same.<br>
<br>
Nico<br>
----------------------------------------------------------------<br>
Message: 4<br>
From: <dsjen@cs.unc.edu><br>
To: vtkusers@public.kitware.com <br>
Date: Fri, 13 Jun 2003 13:20:01 -0400<br>
Subject: [vtkusers] Volume Opacity<br>
<br>
Hello VTK Users,<br>
<br>
I'm having trouble changing the opacity of a vtkVolume. I'm creating <br>
a vtkPiecewiseFunction and adding the following points to the function <br>
with the following lines of code, where opacity is a the piecewise <br>
function:<br>
<br>
opacity.AddPoint(0,
0.0);<br>
opacity.AddPoint(255,0.0);<br>
<br>
This should make the volume completely transparent after I set the <br>
opacity of the volume:<br>
<br>
...<br>
...<br>
property.SetScalarOpacity(opacity);<br>
...<br>
...<br>
actor.SetProperty(property);<br>
...<br>
...<br>
<br>
If anyone has any suggestions, needs clarification, or can point me to <br>
any references, I'd be very grateful. Also, just for reference, I'm <br>
using vtk4.0 on WindowsXP.<br>
<br>
Thanks,<br>
Dennis<br>
<br>
<br>
<br>
====================================================<br>
Nico Vermaas<br>
ASTRON - Westerbork Synthesis Radio Telescope<br>
Schattenberg 1 - 9433 TA Zwiggelte - The Netherlands<br>
<br>
tel: +31 593 598710 <br>
vermaas@astron.nl <br>
====================================================<br>
<br>
<br>
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