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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><st1:flavor2 ProductID="PERIOD"><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><span
style='mso-spacerun:yes'> </span>I am fairly new with VTK (3</span></font></st1:flavor2><st1:flavor2
ProductID="PERIOD"><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>.2), so my experience is limited</span></font></st1:flavor2><st1:flavor2
ProductID="PERIOD"><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>. I have a set of vertices in a 3D Glyph, represented as
spheres</span></font></st1:flavor2><st1:flavor2 ProductID="PERIOD"><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>. So the
spheres are not individual actors</span></font></st1:flavor2><st1:flavor2
ProductID="PERIOD"><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>. I would like to be able to somehow pick individual
spheres and, say, change its color or retrieve the original vertex’s
point value</span></font></st1:flavor2><st1:flavor2 ProductID="PERIOD"><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>. After
studying documentation and example codes, I didn’t see a straight
forward way of doing this</span></font></st1:flavor2><st1:flavor2
ProductID="PERIOD"><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>. I’ve also looked on the web as well as in this list’s
archive</span></font></st1:flavor2><st1:flavor2 ProductID="PERIOD"><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>. There
were similar questions asked, but didn’t see any suggested solutions</span></font></st1:flavor2><st1:flavor2
ProductID="PERIOD"><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>. Has anyone worked out a way to do this? I guess I can
always make individual sphere an actor, but I understand that there are
performance problems with >1K actors</span></font></st1:flavor2><st1:flavor2
ProductID="PERIOD"><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>. I appreciate and look forward to any comment/suggestion
from the community</span></font></st1:flavor2><st1:flavor2 ProductID="PERIOD"><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>. Thanks in
advance</span></font></st1:flavor2><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Jiaye Zhou<o:p></o:p></span></font></p>
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