[Ves] [vtkusers] Kiwi transparent background

[Jurre Hanema]

Aashish,

I did not notice you reposted my message to the VES list, so in my 
enthusiasm I also did so myself, duplicating the question.

Anyway, yes, my intention is to make another Android layer (in this case 
a camera view) show up behind the scene. Strangely, I noticed that when 
I load kiwi.png, the camera image shows through the transparent part of 
the kiwi, so I know the camera view at least works...

- Jurre

On 15/10/13 18:45, Aashish Chaudhary wrote:
> Hi Jurre,
>
> You want to use ves mailing list for this question. You are making the 
> background transparent so that another android layer or something 
> shows up behind it?
>
> - Aashish
>
>
>
> On Tue, Oct 15, 2013 at 12:30 PM, Jurre Hanema <jurre at stack.nl 
> <mailto:jurre at stack.nl>> wrote:
>
>     Hi
>
>     I am developing an app based on the KiwiViewer code. Objects
>     should be rendered on a transparent background, instead of the
>     standard blue one.
>
>     To achieve this, I have modified the function declaration and
>     definition of vesKiwiBaseApp::setBackgroundColor() such as to
>     expose the alpha-argument of vesRenderer::setBackgroundColor():
>
>     void vesKiwiBaseApp::setBackgroundColor(double r, double g, double
>     b, double alpha)
>     {
>       this->Internal->Renderer->setBackgroundColor(r, g, b, alpha);
>     }
>
>     In KiwiNative.cpp, I can now call app->setBackgroundColor() as
>     follows:
>
>     bool loadDataset(const std::string& filename, int builtinDatasetIndex)
>     {
>       // ...
>       app->setBackgroundColor(255, 0, 0, 0);
>       // ...
>     }
>
>     Alas, this does change the background color to solid red instead
>     of transparency.
>
>     How to achieve rendering on a transparent background with Kiwi?
>
>     Regards,
>     Jurre
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> -- 
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com <http://www.kitware.com>