Re: raycasting initially renders at low resolution

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Hello,

Would you mind posting your question to https://discourse.vtk.org?
Community support for VTK is transitioning to that forum, and you are more
likely to get an answer there.

Thanks,
Cory

On Tue, Mar 19, 2019 at 11:27 AM The Merper <[email protected]> wrote:

> Hi VTK-experts,
>    I'm working on an app for viewing CT scans in 3D or 2D. When I
> initially render the CT scan in 3D, the raycast rendering looks great (see
> the attached normalResolution.png). However, when I switch from a 2D view
> (performed via a vtkImageViewer2) back to the 3D raycast rendering, the
> resolution is low (see the attached lowResolution.png). As soon as I
> interact with the 3D rendering, the resolution returns to normal.
>    Can anyone tell me how to fix this? I have AutoAdjustSampleDistance set
> to "off" on the vtkFixedPointVolumeRayCastMapper that I'm using for the
> raycasting. I would have thought that this would keep the resolution of the
> raycasting constant.
>     thank you in advance,
>       -Merps
> _______________________________________________
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-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.

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<div dir=3D"ltr"><div dir=3D"ltr"><div>Hello,</div><div><br></div><div>Woul=
d you mind posting your question to <a href=3D"https://discourse.vtk.org">h=
ttps://discourse.vtk.org</a>? Community support for VTK is transitioning to=
 that forum, and you are more likely to get an answer there.</div><div><br>=
</div><div>Thanks,</div><div>Cory</div></div></div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Mar 19, 2019 at 11:27 =
AM The Merper &lt;<a href=3D"mailto:[email protected]">[email protected]</a=
>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px=
 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><di=
v dir=3D"ltr"><div>Hi VTK-experts,</div><div>=C2=A0=C2=A0 I&#39;m working o=
n an app for viewing CT scans in 3D or 2D. When I initially render the CT s=
can in 3D, the raycast rendering looks great (see the attached normalResolu=
tion.png). However, when I switch from a 2D view (performed via a vtkImageV=
iewer2) back to the 3D raycast rendering, the resolution is low (see the at=
tached lowResolution.png). As soon as I interact with the 3D rendering, the=
 resolution returns to normal.</div><div>=C2=A0=C2=A0 Can anyone tell me ho=
w to fix this? I have AutoAdjustSampleDistance set to &quot;off&quot; on th=
e vtkFixedPointVolumeRayCastMapper that I&#39;m using for the raycasting. I=
 would have thought that this would keep the resolution of the raycasting c=
onstant.</div><div>=C2=A0=C2=A0=C2=A0 thank you in advance,</div><div>=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 -Merps<br></div></div>
_______________________________________________<br>
Powered by <a href=3D"http://www.kitware.com" rel=3D"noreferrer" target=3D"=
_blank">www.kitware.com</a><br>
<br>
Visit other Kitware open-source projects at <a href=3D"http://www.kitware.c=
om/opensource/opensource.html" rel=3D"noreferrer" target=3D"_blank">http://=
www.kitware.com/opensource/opensource.html</a><br>
<br>
Please keep messages on-topic and check the VTK FAQ at: <a href=3D"http://w=
ww.vtk.org/Wiki/VTK_FAQ" rel=3D"noreferrer" target=3D"_blank">http://www.vt=
k.org/Wiki/VTK_FAQ</a><br>
<br>
Search the list archives at: <a href=3D"http://markmail.org/search/?q=3Dvtk=
users" rel=3D"noreferrer" target=3D"_blank">http://markmail.org/search/?q=
=3Dvtkusers</a><br>
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Follow this link to subscribe/unsubscribe:<br>
<a href=3D"https://vtk.org/mailman/listinfo/vtkusers" rel=3D"noreferrer" ta=
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</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature">Cory Quammen<br>Staff R&amp;D Engineer<br>Kitwar=
e, Inc.</div>

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_______________________________________________
Powered by www.kitware.com

Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html

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