Re: [osg-users] Problem with osgEarth::ImageOverlay::setAlpha

[Jason Beverage]

This bug is fixed in the trunk of osgEarth, try pulling and retest.

Thanks,

Jason

On Mon, Apr 23, 2012 at 10:33 AM, Ou Yang  wrote:

> Hi,
>
> The bug has been found in ImageOverlay::init() method.
> The original code is:
>osg::Vec4Array* colors = new osg::Vec4Array(1);
>(*colors)[0] = osg::Vec4(1,1,1,_alpha);
>
>geometry->setColorArray( colors );
>geometry->setColorBinding( osg::Geometry::BIND_OVERALL );
>
> when change it to:
>osg::Vec4Array* colors = new osg::Vec4Array(4);
>(*colors)[0] = osg::Vec4(1,1,1,_alpha);
>(*colors)[1] = osg::Vec4(1,1,1,_alpha);
>(*colors)[2] = osg::Vec4(1,1,1,_alpha);
>(*colors)[3] = osg::Vec4(1,1,1,_alpha);
>
>geometry->setColorArray( colors );
>geometry->setColorBinding( osg::Geometry::BIND_PER_VERTEX );
> the alpha value are applied correctly.
>
> I don't know if it a bug in osg core library.
> ...
>
> Thank you!
>
> Cheers,
> Ou
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=47225#47225
>
>
>
>
>
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Re: [osg-users] Problem with osgEarth::ImageOverlay::setAlpha

[Ou Yang]

Hi,

The bug has been found in ImageOverlay::init() method.
The original code is:
osg::Vec4Array* colors = new osg::Vec4Array(1);
(*colors)[0] = osg::Vec4(1,1,1,_alpha);

geometry->setColorArray( colors );
geometry->setColorBinding( osg::Geometry::BIND_OVERALL );

when change it to:
osg::Vec4Array* colors = new osg::Vec4Array(4);
(*colors)[0] = osg::Vec4(1,1,1,_alpha);
(*colors)[1] = osg::Vec4(1,1,1,_alpha);
(*colors)[2] = osg::Vec4(1,1,1,_alpha);
(*colors)[3] = osg::Vec4(1,1,1,_alpha);

geometry->setColorArray( colors );
geometry->setColorBinding( osg::Geometry::BIND_PER_VERTEX );
the alpha value are applied correctly.

I don't know if it a bug in osg core library.
... 

Thank you!

Cheers,
Ou

--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=47225#47225





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Re: [osg-users] Problem with osgEarth::ImageOverlay::setAlpha

[Glenn Waldron]

Yes, appears to be malfunctioning. I will open an issue for it...thanks.
http://github.com/gwaldron/osgearth/issues/66


Glenn Waldron / @glennwaldron


On Wed, Feb 8, 2012 at 11:38 AM, Ou Yang  wrote:

> Hi,
>
> I use osgEarth::ImageOverlay::setAlpha(float alpha) to change the
> transparency of images, which was draped on terrain, just like what google
> earth does, but this method seems has no effect at all! It also doesn't
> work in the sample osgearth_imageoverlay. Is it a bug?
> I use openscenegraph 3.0.0 and osgearth 2.1.1, build with visual studio
> 2010.
>
>
> Thank you!
>
> Cheers,
> Ou
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=45341#45341
>
>
>
>
> Attachments:
> http://forum.openscenegraph.org//files/1_538.jpg
>
>
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Re: [osg-users] Problem with osgEarth::ImageOverlay::setAlpha

[Chris Hanson]

>
> I use osgEarth::ImageOverlay::setAlpha(float alpha) to change the
> transparency of images, which was draped on terrain, just like what google
> earth does, but this method seems has no effect at all! It also doesn't
> work in the sample osgearth_imageoverlay. Is it a bug?
> I use openscenegraph 3.0.0 and osgearth 2.1.1, build with visual studio
> 2010.
>
>
You will probably get wider exposure for this on the osgEarth forums:

http://forum.osgearth.org/

-- 
Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com
http://www.alphapixel.com/
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[osg-users] Problem with osgEarth::ImageOverlay::setAlpha

[Ou Yang]

Hi,

I use osgEarth::ImageOverlay::setAlpha(float alpha) to change the transparency 
of images, which was draped on terrain, just like what google earth does, but 
this method seems has no effect at all! It also doesn't work in the sample 
osgearth_imageoverlay. Is it a bug?
I use openscenegraph 3.0.0 and osgearth 2.1.1, build with visual studio 2010.


Thank you!

Cheers,
Ou

--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=45341#45341




Attachments: 
http://forum.openscenegraph.org//files/1_538.jpg


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