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Hi David,<br>
<br>
Thanks for the suggestion. I'm still using VTK 6.1 though. I'll see
if I can squeeze in an upgrade to 6.2 or 6.3 to try this out.<br>
I'll also take a look at the documentation of vtkValuePasses in the
meantime.<br>
<br>
<div class="moz-cite-prefix">On 8/8/2015 8:30 AM, David E DeMarle
wrote:<br>
</div>
<blockquote
cite="mid:CANjZAi-c_DGU7zZdqXq-KYpy+cc+1BcsPBNb7zTzHE1749UUjQ@mail.gmail.com"
type="cite">
<div dir="ltr">You might use vtkValuePasses. This is a new class
in vtk6.2 and note it has not yet been ported to the OpenGL2
backend but I need to do that in the next two months or so. See
the tests for examples of its use. It was developed for Cinema.
<div><br>
</div>
<div>What it does is render specific arrays into the color
buffer. Then with a pixel color and the min and max values of
the array you can recover the value behind the pixel - within
conversion to/from 24bit representation tolerance that is. It
is similar to the way selection works but with this you will
be able to skip the step of looking up the particular
node/element behind the pixel before recovering the value.
<div><br>
</div>
<div>I have not yet used it for the exact purpose you
describe, but I've meant to since before I wrote it and
should be able to assist.</div>
</div>
</div>
<div class="gmail_extra"><br clear="all">
<div>
<div class="gmail_signature">David E DeMarle<br>
Kitware, Inc.<br>
R&D Engineer<br>
21 Corporate Drive<br>
Clifton Park, NY 12065-8662<br>
Phone: 518-881-4909</div>
</div>
<br>
<div class="gmail_quote">On Fri, Aug 7, 2015 at 1:49 PM, Serge
Lalonde <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:serge@infolytica.com" target="_blank">serge@infolytica.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Hello VTK Users,<br>
<br>
I'm looking for for some pointers on adding dynamic field
probing in my window as the mouse moves over (or hovers)
over a field being displayed. I could implement it myself
from scratch, but somehow I feel that there must be a
"VTK-approved" method of doing it.<br>
<br>
Something like this:<br>
<img src="cid:part2.05080809.05080104@infolytica.com"
alt=""><br>
<br>
I found the vtkBalloonWidget and vtkProbeFilter, but I'm
unsure how to use them separately or together to get what
I want.<br>
<br>
Any suggestions are welcome. Thanks!<span class="HOEnZb"><font
color="#888888"></font></span><br>
</div>
</blockquote>
</div>
</div>
</blockquote>
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