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<div class="moz-cite-prefix">Thank you very much for confirming the
problem and related information.<br>
<br>
Best,<br>
Weiguang<br>
<br>
On 14/09/2015 10:48 AM, Simon ESNEAULT wrote:<br>
</div>
<blockquote
cite="mid:CAC9gB0DAWQ6oJhOsGTJQVY4W7egV8BnqfEtdkCBMA1_2sBuZfg@mail.gmail.com"
type="cite">
<div dir="ltr">Hello,<br>
<br>
Yes we were suffering the same issue.
<div>I believe the change occurred with this commit<br>
<a moz-do-not-send="true"
href="https://github.com/Kitware/VTK/commit/0164fa1e25d9c584e7ec60acb7e221f7ea9e5d7c">https://github.com/Kitware/VTK/commit/0164fa1e25d9c584e7ec60acb7e221f7ea9e5d7c</a><br>
The 128x256x256 thing is no longer hard coded, it now relies
on the vtkgl::MAX_3D_TEXTURE_SIZE variable to compute a
correct reduction ratio, which will lead to this significant
slow down.</div>
<div><br>
Some more explanations :<br>
<a moz-do-not-send="true"
href="http://marc.info/?l=vtkusers&m=128869084800678">http://marc.info/?l=vtkusers&m=128869084800678</a></div>
<div><br>
The Volume Texture Mapper 3D has just been marked as
deprecated so I don't think there will be any sort of fix, but
you should be able to restore the old behavior if you look to
the commit, and revert the changes made in the method
<div>int
vtkOpenGLVolumeTextureMapper3D::IsTextureSizeSupported(int
size[3], int components){...}<br>
<br>
Best Regards<br>
Simon<br>
<br>
<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2015-09-14 15:55 GMT+02:00 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>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>Hi David,<br>
<br>
I'll try vtkImageResize. Thanks.<br>
<br>
Best,<br>
Weiguang
<div>
<div class="h5"><br>
<br>
On 11/09/2015 1:48 PM, David Gobbi wrote:<br>
</div>
</div>
</div>
<div>
<div class="h5">
<blockquote 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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-- <br>
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<div>------------------------------------------------------------------<br>
Simon Esneault
<div>Rennes, France<br>
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