[Rtk-users] Forward projector output discrepancy

[Simon Rit]

Hi Brandon,
Thanks for reporting the weird behavior. This is a bug, you're trying to
project with a parallel geometry and the Cuda forward projector does not
support parallel geometry. I have fixed the code and you should now get the
expected exception, see this patch
<https://github.com/SimonRit/RTK/commit/b433503bcd38bf8b75bbd0e37fa009d0486228f1>
.
Sorry about that...
Simon

On Tue, Aug 13, 2019 at 8:04 PM Brandon LaCava via Rtk-users <
rtk-users at public.kitware.com> wrote:

> Hi. I'm getting vastly different outputs from the Joseph forward projector
> vs. Cuda, given the exact same inputs. I'm hoping someone has any idea why.
> Here's some sample images:
>
> 1. Joseph
>
> [image: drr_Jospeph.png]
>
> 2. Cuda
>
> [image: drr_CudaRayCast.png]
>
> The general orientation looks the same, but the FOV is wildly different.
> I've attached a small stripped-down rtkforwardprojections.cxx which was
> used to generate these images. Literally the only difference between the
> two runs is the projector type. Everything else is identical. Input is from
> a CT MHD, output to PNG. Same result on Windows and Linux.
>
> Any help here would be appreciated. Thanks!
>
> Cheers,
> Brandon
>
>
>
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