[vtkusers] Near plane clipping problem

[Wayne Christopher]

I am having a clipping problem with 5.8 and saw this posting:

http://www.vtk.org/pipermail/vtkusers/2009-April/100412.html

Is this still an outstanding issue?  I didn't see the code from the 
patch in the 5.8 source but there were other changes so maybe it's been 
fixed in a different way.

Thanks,

     Wayne

 > -----Original Message-----
 > From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org 
<vtkusers-bounces at vtk.org>] On Behalf
 > Of Serge Lalonde
 > Sent: Friday, October 17, 2008 10:10 AM
 > To: VTK Users
 > Subject: [vtkusers] Near plane clipping problem
 >
 > Has anyone ever noticed that it is very easy to cause the near clipping
 > plane to cut-off the model when in parallel projection mode?
 >
 > I ran into this recently when adding a vtkBoxWidget and scaling a simple
 > cube a few times after rotating it so that one of the corners points 
towards
 > the viewer.
 >
 > I tried calling vtkRenderer::ResetCameraClippingRange() to no avail.
 > vtkRenderer::ResetCamera() fixed the problem, but would lose my camera
 > setting.
 >
 > After searching fruitlessly in the vtkusers archives, I decided to trace
 > into the code and I discovered that there is code in
 > vtkRenderer::ResetCameraClippingRange() and
 > vtkCamera::SetClippingRange() that modifies the near plane value to "fix"
 > potential camera and depth buffer problems. In my opinion, these 
fixes are
 > valid, but only for perspective projections. For parallel 
projections, they
 > are unnecessary and in fact cause the clipping problem I was 
encountering.
 > To test this, I modified the code and rebuilt and lo and behold, no more
 > near plane clipping!
 >
 > I decided to document this in the vtkusers list in case others have 
run into
 > this problem. Attached is my modified version of vtkCamera.cxx and
 > vtkRenderer.cxx along with the patch files relative to version 5.2.0 
(only
 > vtkCamera.cxx has changed since then). The changes are small and 
localized.
 > If anyone tries them, let me know if you run into any problems (or 
even if
 > you don't). I will submit them to Kitware for consideration also.
 >