[vtkusers] raycasting initially renders at low resolution

Cory Quammen cory.quammen at kitware.com
Tue Mar 19 11:43:54 EDT 2019


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.


On Tue, Mar 19, 2019 at 11:27 AM The Merper <msmerps at gmail.com> 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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