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<p class="MsoNormal">Hi everyone,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span lang="EN-US">I’m converting a filter I’ve designed into CUDA, and I’m new to CUDA. The filter takes in input a 4d image (3D +time), interpolates between two instants (two 3D images taken from the 4D image by selecting a given instant)
to obtain a 3D image, and forward projects through this 3D image. I already have an interpolation kernel that works, it uses global memory to store both the 4D image and the interpolated 3D image (there probably is a better way, but I’ll optimize that later).
For the forward projection, I’d like to reuse as much as possible the rtkCudaForwardProjectionImageFilter code, but :</span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt"><span lang="EN-US"><span style="">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><span lang="EN-US">rtkCudaForwardProjectionImageFilter stores its input 3D volume into a 3D texture</span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt"><span lang="EN-US"><span style="">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><span lang="EN-US">texture memory, I think, is read-only for threads</span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt"><span lang="EN-US"><span style="">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><span lang="EN-US">So I can’t fill in the 3D texture during interpolation</span></p>
<p class="MsoNormal"><span lang="EN-US">I think I need to work with global memory during interpolation to generate the 3D volume, then
<u>somehow</u> copy the result to a 3D texture, and use the existing (maybe slightly modified) forward projection function to get the projection.
</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">My problem is in the “somehow”… Do I need to actually copy the data from the global memory to the texture memory ? Or is it enough to bind it to a texture ? Does anyone have an example somewhere ?</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,</span></p>
<p class="MsoNormal"><span lang="EN-US">==========================================</span></p>
<p class="MsoNormal"><span lang="EN-US">Cyril Mory</span></p>
<p class="MsoNormal"><span lang="EN-US">PhD student at Philips Medisys and CREATIS</span></p>
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