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<div class="moz-cite-prefix">Hi David,<br>
<br>
I'll try vtkImageResize. Thanks.<br>
<br>
Best,<br>
Weiguang<br>
<br>
On 11/09/2015 1:48 PM, David Gobbi wrote:<br>
</div>
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cite="mid:CANwS1=HWif4Odj0uQdV-E4fT+pZKO1oTfQYxEkcFDVoC9GM_iA@mail.gmail.com"
type="cite">
<div dir="ltr">Hi Weiguang,
<div><br>
</div>
<div>You can do the image resizing as a preliminary step with
vtkImageResize, which does efficient band-limited sinc
interpolation and can do a good job of shrinking the image
without introducing aliasing artifacts.</div>
<div><br>
</div>
<div>Hopefully someone else will answer your question about
vtkVolumeTextureMapper3D (I haven't used it in a while).</div>
<div><br>
</div>
<div> - David<br>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Sep 11, 2015 at 11:22 AM,
Weiguang guan <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:guanw@rhpcs.mcmaster.ca" target="_blank">guanw@rhpcs.mcmaster.ca</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> Hello VTK users,
<br>
<br>
We develop a viz system using vtkVolumeTextureMapper3D
for volume rendering. Recently, we've moved up from
v5.1 to v6.2. After that, we notice our viz system has
a significant slow-down in rendering speed (compared
on the same computer) when volume size is large, say
LxWxH ~= 512<sup><span
style="display:inline-block;width:0;min-height:0;overflow:hidden">^</span>3</sup>.
It can always render small volumes at interactive
rate. <br>
<br>
I know that vtkVolumeTextureMapper3D needs to resample
large volume to fit in 128*256*256 (BTW, our data is
regular volume data with a single component). But this
down-sampling process is not new in 6.2. Are there
other changes that cause the performance issue? Does
anyone experience the same issue? Thanks. <br>
<br>
Best, <br>
Weiguang</div>
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