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If "1/cmax" is failing for a rendered image, that could mean it's
all black (max pixel=0) ... or maybe that there had been a NaN in it
somewhere which could likewise break the automatic rescaling. Are
you using the rendering interface where you call something like<br>
<br>
cam.snapshot( "image.png" )<br>
<br>
to make it save an image? If so you might try<br>
<br>
rawim = cam.snapshot()<br>
<br>
and look at the distribution of raw rendered pixel values in rawim,
which should be a 3-dimensional array (image size x 4 or
something). Maybe the fraction of positive values: numpy.sum(
rawim > 0 ) / float(rawim.size)<br>
<br>
Also, Dave, are you rendering using multiple threads? <br>
<br>
<div class="moz-cite-prefix">On 5/28/15 3:52 PM, Dave Semeraro
wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><a moz-do-not-send="true"
name="_MailEndCompose"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Did
a bit more experimentation. The error only appears when I
run in parallel. Serial runs execute fine but take a long
time. So there is some monkey business going on with
parallel ray tracing that is triggered by the image size I
was using. I am also using a rather large enzo dataset.
Thanks for considering the problem.
<o:p></o:p></span></a></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Dave<o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
yt-users [<a class="moz-txt-link-freetext" href="mailto:yt-users-bounces@lists.spacepope.org">mailto:yt-users-bounces@lists.spacepope.org</a>]
<b>On Behalf Of </b>Nathan Goldbaum<br>
<b>Sent:</b> Thursday, May 28, 2015 2:58 PM<br>
<b>To:</b> Discussion of the yt analysis package<br>
<b>Subject:</b> Re: [yt-users] is there a limit on image
size?<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On Thu, May 28, 2015 at 12:54 PM,
Dave Semeraro <<a moz-do-not-send="true"
href="mailto:semeraro@tacc.utexas.edu" target="_blank">semeraro@tacc.utexas.edu</a>>
wrote:<o:p></o:p></p>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Helly
yt-crowd.
<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I
am doing some volume rendering in yt and getting
some errors when I try to grow the image size. I
am trying to write a png image that is 1024 x
1024. I get the following errors:<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">image_array.py:229:
RuntimeWarning: invalid value encountered in
multiply<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">np.multiply(self[:,
:, :3], 1.0/cmax, out[:, :, :3])<o:p></o:p></p>
</div>
</div>
</blockquote>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">The warning is being triggered
here:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><a moz-do-not-send="true"
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__bitbucket.org_yt-5Fanalysis_yt_src_8ad62b62439013a33e3a2b568a5a26b567e93f54_yt_data-5Fobjects_image-5Farray.py-3Fat-3Dyt-23cl-2D229&d=AwMGaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=hgcBC3x6dKFoTrmFmMYYbKNfiHZlGLKliIidd1LwmHI&m=hO5pXcuw5fvvxeGv-5LRShhzRc-WbkaimZIYkj52SZM&s=OH-bab2JlwA0taRkzQRsirFtSlIP1tPzZHqBB6bQN-g&e=">https://bitbucket.org/yt_analysis/yt/src/8ad62b62439013a33e3a2b568a5a26b567e93f54/yt/data_objects/image_array.py?at=yt#cl-229</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">which I think means cmax is 0. I'd
need to see the full traceback or step through
execution in a debugger to figure out why.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC
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<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">yt_array.py:764:
RuntimeWarning: divide by zero encountered in
divide<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
return YTArray(super(YTArray, self).__rdiv__(lo))<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The
largest image I can generate is about 800x 800. It
is a nice image too I tell ya. Just wish I could
do a bigger one to submit for publication.<o:p></o:p></p>
</div>
</div>
</blockquote>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">There's no limit on the image size
for a volume rendering.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0in 0in 0in
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<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Attached
is the script I am using. Any help would be great.
<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks,
<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Dave
Semeraro<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
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<p class="MsoNormal"><o:p> </o:p></p>
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