[vtkusers] 3D volume camera clipping help

[mark.ostroot at lickenbrocktech.com]

Hello David,
 
Thanks for the tip, but I don't believe this is the source of my issue in this case. I perform a shift and scale on the incoming data to effectively make everything a 16-bit unsigned integer and the Opacity function I am using is adjustable by the user, so you can make the air section transparent. The clipping still occurs regardless of the opacity applied to the volume though.
 
Thanks,
Mark Ostroot
--------- Original Message --------- Subject: Re: [vtkusers] 3D volume camera clipping help
From: "David Gobbi" <david.gobbi at gmail.com>
Date: 6/27/18 12:50 pm
To: mark.ostroot at lickenbrocktech.com
Cc: "VTK Users" <vtkusers at vtk.org>

  Hi Mark,
 
One possible cause of this issue is that the background (or air) value in CT is -1000 while the default background value for vtkImageReslice is zero.  Try using SetBackgroundLevel(-1000.0) when you reslice the data to see if that fixes the problem. 
 
 - David

 
 On Wed, Jun 27, 2018 at 1:39 PM, <mark.ostroot at lickenbrocktech.com> wrote:
  Hello,
 
I have a 3D volume of some CT Data that works fine at the original aspect Ratio. I have some code that adjusts the aspect ratio of the volume by using the VtkReSlicer. Which works well for applying a new aspect ratio. My issue is that whenever my aspect ratio is non-Cubic I get some clipping of my volume at certain angles when it is being rotated around. I have tried using the "ResetCameraClippingRange" function, but this seems to have no effect on my Rendered volume. I know that the clipping range bounds are computed from the actor dimensions and they don't seem to change when I change the aspect ratio. Does anyone have any ideas on what I may be missing?
 
 
Some noteworthy information:
C++ application
VTK version 8.1.1
Render window is a QT openGL Widget
 
Thanks in advance,
Mark O
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