[Paraview] Volume Rendering Issues/Bugs

[Mohamed Beshr]

It is much better now. However, now the tube becomes one solid red color
although the legend range is the same (see screenshot below for difference
between original and re-sampled view). Please advise how can I fix this (I
changed opacity scale shown in the figure between 0 and 1 and still the
same).





On Thu, Mar 29, 2018 at 5:43 PM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> You're getting an empty cubiod because it's showing as outline. Try
> changing the "representation" type to Volume from Outline. Is that any
> better? You may need to adjust your color/opactiy transfer function.
>
>
>
> On Thu, Mar 29, 2018 at 2:49 PM, Mohamed Beshr <mbeshr1986 at gmail.com>
> wrote:
> > Thank you for your reply. Yes I have an unstructured grid. Regarding the
> > resample to image filter, when I select it in my case, I get an empty
> > cuboid. Why is that? Is there a way to get the image matching my shape?
> >
> > On Mon, Mar 26, 2018 at 3:38 PM, Utkarsh Ayachit
> > <utkarsh.ayachit at kitware.com> wrote:
> >>
> >> > a.      When I select “Real Time” option and increase the time, even
> >> > though
> >> > it  is cached, it still keeps reloading which prevents the VR from
> >> > working.
> >> > Is there any potential/possibility to fix this in the meantime or
> >> > upcoming
> >> > release?
> >>
> >> Caching cannot work in "real time"  mode since there's no guarantee
> >> what time each frame will be rendered at.
> >>
> >> > b.      When I cache it as a volume (rather than surface, wireframe,
> or
> >> > points) on my laptop, it crashed the exe even when I increase the
> cache
> >> > memory maximum size. Any thoughts on that? I tested it on a bigger and
> >> > faster work station and it worked, however, it still has the issue
> >> > mentioned
> >> > in the point below.
> >>
> >> I suspect you're just running out of memory on the system, esp since
> >> you say smaller mesh works.
> >>
> >> > 2.      When I get a smaller mesh (4x smaller), I am able to cache it
> as
> >> > a
> >> > volume. However, when playing it back, it keeps reloading while
> showing
> >> > the
> >> > green bar as below at each time step. Is that supposed to happen? Is
> >> > that
> >> > rendering? Is there a way to eliminate it or make it faster?
> >>
> >> Yes, that's rendering. Cache doesn't cache rendering artifacts. Seems
> >> to me you have unstructured grid which is using  the slow path for
> >> volume rendering. Another option is to apply "Resample To Image"
> >> filter to resample the dataset to an image and volume rendering the
> >> result. Then rendering should be much faster. You can also resample
> >> and generate the image as a processing stage and save the resampled
> >> dataset out and then load and render it in the animation loop.
> >
> >
> >
> >
> > --
> > Best Regards,
> > Mohamed Beshr
>



-- 
Best Regards,
Mohamed Beshr
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