[vtkusers] Viewport clipping

[Bill Lorensen]

Can you post the code?

On Wed, Jun 29, 2016 at 10:39 AM, Doug Hoppes <dhoppes at mbfbioscience.com>
wrote:

> Sorry about that…. Here’s more information…
>
>
>
> In VTK Version 6.2.0 using the OpenGL flag, this is what we see in all 4
> viewports, we see that the vtkimageactor looks fine.
>
>
>
>
>
> However, we just moved to VTK Version 7.0.0 using the OpenGL2 flag.  This
> is what we now see:
>
>
>
>
>
> Notice the clipping. The upper two viewports show nothing, the bottom
> viewport is correct and the rightmost viewport is clipped in the center of
> the viewport. If we resize the overall vtk window, the viewport is still
> clipped in the center.  It seems that there is no display to the right-side
> of the viewport.  In the main right viewport, we can actually move the
> objects around without a problem but the results are still clipped.
>
>
>
> We have seen this issue with really large vtkvolumes but it doesn’t happen
> all of the time.  Using the vtkimageactor, this happens consistently.  This
> problem does not present itself with any generic vtkactors.
>
>
>
> I’ll also check the vtkImageSliceMapper code to see if I can get any
> information from it.
>
>
>
> Doug
>
>
>
> *From:* David Gobbi [mailto:david.gobbi at gmail.com]
> *Sent:* Wednesday, June 29, 2016 9:03 AM
> *To:* Doug Hoppes
> *Subject:* Re: [vtkusers] Viewport clipping
>
>
>
> Hi Doug,
>
>
>
> Please keep the discussion on the list.  It's possible that the near/far
> clipping planes are too tight.  When you reset the focal point, you can try
> calling SetClippingRange(near, far) at the same time.
>
>
>
> Also, I hate to be redundant, but what version of VTK are you using? Do
> you see this only with vtkImageActor, or also with vtkVolume?  It helps me
> help you if you answer these questions...
>
>
>
>  - David
>
>
>
>
>
> On Wed, Jun 29, 2016 at 6:45 AM, Doug Hoppes <dhoppes at mbfbioscience.com>
> wrote:
>
> Hey  David!
>
>
>
>                 Thanks for responding.  Here’s what we are seeing:
>
>
>
>
>
> I can move the image in the 3D area without any problem…. It’s just that
> the image is clipped.  We have seen it happen with a couple of large images
> and I noticed that it happens when I try to reset the camera focal point.
>
>
>
> *From:* David Gobbi [mailto:david.gobbi at gmail.com]
> *Sent:* Wednesday, June 29, 2016 8:25 AM
> *To:* Doug Hoppes
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] Viewport clipping
>
>
>
> On Wed, Jun 29, 2016 at 6:10 AM, Doug Hoppes <dhoppes at mbfbioscience.com>
> wrote:
>
> Hey all,
>
>
>
>                 Running into a critical issue and not sure where to turn.
> We’ve been using vtkViewport for a while and never seem to have an issue
> with them.  However, just updated the software and moved to OpenGL2 and now
> running into an issue.  Some of the viewports seem to be clipped.  I can
> move my objects without a problem in them but, in one case, vtkImageActor,
> the display is clipped.
>
>
>
>                 Is there a particular place I can look at in the code to
> see what is happening?  The vtkViewport code seems to have the correct port
> size.  Where is the display rendering done?  I’ve noticed that, if I use a
> sphere actor or any general surface actor, there doesn’t seem to be a
> problem.  It only happens when I’m rendering a volume or an image actor.
>
>
>
> Hmm... I haven't seen anything like this.  By "clipped", do you mean that
> the actor/volume is limited to a rectangle that is smaller than the
> viewport?  Is this rectangle always in the upper left corner of the
> viewport, or is it somewhere else?  When you say "rendering a volume", do
> you mean rendered with a vtkVolume?  If so, what volume mapper was used?
> What version of VTK?
>
>
>
> For OpenGL2 the vtkImageActor rendering is done
> by Rendering/OpenGL2/vtkOpenGLImageSliceMapper.cxx, which in turn uses
> vtkTexture and vtkPolyDataMapper.
>
>
>
>  - David
>
>
>
>
>
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-- 
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