<div dir="ltr"><div><div><div>Hi Yannick,<br></div>I would just try to change the <a href="http://www.openrtk.org/Doxygen/classrtk_1_1CudaForwardProjectionImageFilter.html#a93671bae5219bada43b9a00b6046dbed">step size</a>. Indeed, the CPU version is the Joseph projector and it adapts automatically the step size to each ray for bilinear interpolation in each slice. The GPU version is a fixed step size combined with a trilinear interpolation.<br></div><div>Merry Christmas to you,<br></div></div>Simon<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 22, 2017 at 9:17 PM, Yannick Boursier <span dir="ltr"><<a href="mailto:boursier@cppm.in2p3.fr" target="_blank">boursier@cppm.in2p3.fr</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">
<p>Hi Cyril, <br>
</p>
<p>Sorry for my late answer. First thank you because your last trick
(removing <InpuImageType>) worked, I correctly compiled and
installed everything.</p>
<p>I am late because I thought that I did something wrong since when
I tested the code by simply projecting then backprojecting a
simple volume, the results between the CPU-codes and GPU-codes
were different and the GPU result cas clearly wrong. <br>
</p>
<p>I understood this morning the problem and put it in evidence :
the CudaForwardProjectionImageFilt<wbr>er seems to be not adapted to
the case when the size of voxels and pixels are not equal to 1
whereas the CudaBackProjectionImageFilter is OK for that !! <br>
</p>
<p>I will try to debug it and let you know.</p>
<p>I wish to all of you a Merry Christmas and relaxing holidays.</p>
<p>Best ,</p>
<p>Yannick<br>
</p><div><div class="h5">
<br>
<div class="m_-4428931898617340006moz-cite-prefix">Le 18/12/2017 à 16:52, Cyril Mory a
écrit :<br>
</div>
<blockquote type="cite">
<p>Hi again Yannick,</p>
<p>Simply removing the <InputImageType> on line 9 of your
.json file made it compile. I didn't test it yet. Let us know if
that works for you.</p>
<p>Cyril<br>
</p>
<br>
<div class="m_-4428931898617340006moz-cite-prefix">On 18/12/2017 16:31, Cyril Mory
wrote:<br>
</div>
<blockquote type="cite">
<p>Hi Yannick,</p>
<p>You seem to be in a hurry, so I'll start with an incomplete
answer: the CudaForwardProjectionImageFilt<wbr>er is templated over
its input and output image type, but the
CudaBackProjectionImageFilter isn't (compare
rtkCudaForwardProjectionImageF<wbr>ilter.h and
rtkCudaBackProjectionImageFilt<wbr>er.h, there is not "template
<>" before the class definition in ...Back..., while it
is there in ...Forward...).<br>
</p>
I'm trying to modify your .json file accordingly, recompile and
test, but I never use SimpleRTK myself, so you might find the
solution before I do. If so, please report back on this mailing
list.<br>
<br>
Cyril<br>
<br>
<br>
<div class="m_-4428931898617340006moz-cite-prefix">On 18/12/2017 16:07, Yannick
BOURSIER wrote:<br>
</div>
<blockquote type="cite">
<pre>Hello all,
I really need in "relative" emergency to execute the kernel CudaBackProjectionImageFilter using the Python Wrapper provided by SimpleRTK.
Unfortunately, this is not implemented in cuda (<wbr>CudaForwardProjectionImageFilt<wbr>er is but not the BackProjection).
I tried to define a json file (in attachement) on the base of CudaForwardProjectionImageFilt<wbr>er (since all the h, hxx, cxx, files I looked at seemed to be the same for these two kernels) but it does not compile (cmake instruction OK but not the make instruction) with the following error :
/data/boursier/Compile/rtk-<wbr>bin-extended/SimpleRTK-build/<wbr>Code/BasicFilters/src/<wbr>srtkCudaBackProjectionImageFil<wbr>ter.cxx: In member function ‘rtk::simple::Image rtk::simple::<wbr>CudaBackProjectionImageFilter:<wbr>:ExecuteInternal(const rtk::simple::Image&, const rtk::simple::Image&)’:
/data/boursier/Compile/rtk-<wbr>bin-extended/SimpleRTK-build/<wbr>Code/BasicFilters/src/<wbr>srtkCudaBackProjectionImageFil<wbr>ter.cxx:132:16: error: ‘rtk::<wbr>CudaBackProjectionImageFilter’ is not a template
typedef rtk::<wbr>CudaBackProjectionImageFilter<<wbr>InputImageType> FilterType;
I would very much appreciate some help please because at this point, I have no idea about the problem...
Thanks in advance,
Best regards,
Yannick Boursier</pre>
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