[Paraview] Volume Rendering Issues/Bugs

[Utkarsh Ayachit]

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