[Ves] Kiwi transparent background

[jurre at stack.nl]

Thanks, I think I can figure most of it out from here. I am new to  
VES, so I wonder what is the reasoning for encapsulating the  
functionality I need in a class vesBackground::vesInternal, thus  
hiding it from the headers and documentation?

-- Jurre

Quoting "Aashish Chaudhary" <aashish.chaudhary at kitware.com>:

> Hi Jurre,
>
> You will have to add blend attribute as well (vesBlend).  The default blend
> equation probably will work for you. Have a look at the vesBackground.cpp.
>  Let us know if you need any help.
>
> - Aashish
>
>
>
> On Tue, Oct 15, 2013 at 1:30 PM, Jurre Hanema <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, such
>> that another Android layer (a camera view, in this case) can be displayed
>> behind it.
>>
>> 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 changes 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
>