[Ves] Kiwi transparent background

[Aashish Chaudhary]

That would work too!. In case, can you send me the code with your failed
attempts with vesBlend attribute? If that's Ok? I just wanted to make sure
that we don't have a bug in the code.

Thanks for the update.

- Aashish



On Tue, Oct 22, 2013 at 11:11 AM, Jurre Hanema <jurre at stack.nl> wrote:

> After failed attempts with the blend attributes, I simply solved my
> problem by removing the background from the camera in the renderer:
>
> phxRenderer::phxRenderer(): vesRenderer()
> {
>     this->camera()->removeChild(**this->background());
> this->camera()->setClearMask(**vesStateAttributeBits::**ColorBufferBit |
> vesStateAttributeBits::**DepthBufferBit);
> }
>
> (I created the subclass phxRenderer for this because I want to keep my
> changes local to my application)
>
> -- Jurre
>
> On 19/10/13 01:14, Aashish Chaudhary wrote:
>
>> On Fri, Oct 18, 2013 at 2:24 PM, <jurre at stack.nl <mailto:jurre at stack.nl>>
>> wrote:
>>
>>     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?
>>
>>
>> We can expose this feature now. We just didn't have the requirement at
>> that time and it should be easy to add. If you happen to add this feature,
>> send a patch to us so that we can push it upstream (you as the author). *I
>> should note that this may cause some issues to your transparent objects in
>> the scene  though. You may have to use a different blend equation if you
>> chose to make the background transparent. *
>>
>>
>> Thanks,
>>
>>
>>     -- Jurre
>>
>>     Quoting "Aashish Chaudhary" <aashish.chaudhary at kitware.com
>>     <mailto:aashish.chaudhary@**kitware.com<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
>>         <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, 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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>>
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>>
>>
>>
>>
>>         --
>>         | Aashish Chaudhary
>>         | R&D Engineer
>>         | Kitware Inc.
>>         | www.kitware.com <http://www.kitware.com>
>>
>>
>>
>>
>>
>>
>> --
>> | Aashish Chaudhary
>> | R&D Engineer
>> | Kitware Inc.
>> | www.kitware.com <http://www.kitware.com>
>>
>
>


-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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