[vtkusers] VTK6 + Java7 on Mac: offscreen rendering?

[Marco Sambin]

Hi Seb,

this is great news, and I will give it a try!
One question: will I be able to keep using vtkCanvas as a Java panel class,
or rather shall I move to something different?
Thanks again for your feedback.

Best regards,

Marco Sambin



On Mon, Sep 9, 2013 at 2:45 PM, Sebastien Jourdain <
sebastien.jourdain at kitware.com> wrote:

> Hi Marco,
>
> you won't be able to rely on offscreen rendering on Mac to properly handle
> the issue you are trying to overcome.
>
> Although, a couple of weeks ago, I've pushed a new set of classes that
> works on Mac OS X and Java7 (and on the other of the platforms).
> Those classes rely on JOGL to do the rendering. So if adding JOGL as a
> dependency is not an issue, you can directly use those.
>
> For that you will need to get VTK/master from git and when you build VTK,
> you will have to turn ON that component. Moreover if you already download
> JOGL/GLUGEN using maven, CMake should find the appropriate jars for you.
> Otherwise you will need to specify their paths.
>
> Here is the dependency for Maven.
>
> +                <dependency>
> +                    <groupId>org.jogamp.jogl</groupId>
> +                    <artifactId>jogl-all-main</artifactId>
> +                    <version>2.0.2</version>
> +                </dependency>
> +                <dependency>
> +                    <groupId>org.jogamp.gluegen</groupId>
> +                    <artifactId>gluegen-rt-main</artifactId>
> +                    <version>2.0.2</version>
> +                </dependency>
>
> Hope that could help you,
>
> Seb
>
>
>
> On Mon, Sep 9, 2013 at 7:22 AM, Marco Sambin <m.sambin at gmail.com> wrote:
>
>> Dear VTKers,
>>
>> I am developing a VTK 6-based Java application, and I am making some
>> efforts to make it compatible with Mac OS X as well.
>>
>> I know that the jawt embedding currently supported by Java 7 on Mac
>> (which is CALayer-based) does not work with VTK 6 (nor with previous VTK
>> versions), but there are several portions of my application which do not
>> use direct drawing by VTK classes to Java panels (i.e., do not use jawt),
>> hence will work fine on Mac + Java 7 as well.
>>
>> Now, for the portions of my application where VTK classes need to
>> actually "draw", my question is: will offscreen rendering work on Mac? The
>> basic idea would be to grab the output of the offscreen rendering, convert
>> it to a Java-compatible image, and draw it to a Java panel. I know this
>> will be a significant performance penalty, but my requirements in this
>> moment are not so strict or demanding under this point of view.
>>
>> In particular, I have a vtkCanvas-derived panel, where I display some
>> planes in 3D (actually, they are vtkImagePlaneWidgets, but I am mainly
>> interested in the "display" functionality, not in the interactivity of the
>> widget with the user). Will it be sufficient to call
>> myVtkCanvas.GetRenderWindow().SetOffScreenRendering(1) to obtain offscreen
>> rendering on my Mac? Or it is more complicated than that?
>>
>> Currently, calling just
>> myVtkCanvas.GetRenderWindow().SetOffScreenRendering(1), I am obtaining a
>> crash in the OpenGL library when running my application on the Mac.
>>
>> Thanks in advance for your feedback.
>>
>> Best regards,
>>
>> Marco
>>
>>
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