Hi,
I used the following codes to create Volume data display.
osg::ref_ptr<osg::Image> osgImage = new osg::Image;
osg::ref_ptr<osgVolume::Volume> osgVolume = new osgVolume::Volume;
osg::ref_ptr<osgVolume::VolumeTile> osgTile = new osgVolume::VolumeTile;
osg::ref_ptr<osgVolume::ImageLayer> osgLayer = new
osgVolume::ImageLayer(osgImage.get());
osgTile->setLayer(osgLayer.get());
osgVolume->addChild(osgTile.get());
osgVolume::AlphaFuncProperty* ap = new osgVolume::AlphaFuncProperty(0.02f);
osgVolume::SampleDensityProperty* sd = new
osgVolume::SampleDensityProperty(0.005);
osgVolume::TransparencyProperty* tp = new
osgVolume::TransparencyProperty(1.0);
osgVolume::TransferFunctionProperty* tfp = new
osgVolume::TransferFunctionProperty(osgTransFunc.get());
osgVolume::CompositeProperty* cp = new osgVolume::CompositeProperty;
cp->addProperty(ap);
cp->addProperty(sd);
cp->addProperty(tp);
cp->addProperty(tfp);
osgLayer->addProperty(cp);
osgTile->setVolumeTechnique(new osgVolume::RayTracedTechnique);
The above codes are used on initializing. I created the image pointer and
assigned to image layer. Then I will use setImage method to assign I defined
the data pointer.
osgImage->setImage(nx, ny, nz, 4, GL_RGBA, GL_UNSIGNED_BYTE, pdisp_ptr,
osg::Image::NO_DELETE, 1);
// where nx, ny, nz are size of data (width, height, depth);
// where pdisp_ptr is assigned for using defined data
//Then I also used the following codes to set the size of volume data. I
wonder whether I need the following codes if I already the size into image
pointer.
osg::ref_ptr<osg::RefMatrix> matrix = new osg::RefMatrix(nx, 0.0, 0.0,
0.0,
0.0, ny, 0.0, 0.0,
0.0, 0.0, nx, 0.0,
0.0, 0.0, 0.0, 1.0);
osgLayer->setLocator(new osgVolume::Locator(*matrix));
osgTile->setLocator(new osgVolume::Locator(*matrix));
Then I will try to assign the data value to pdisp_ptr. After that, I will
call osgImage->dirty(). But there is no changed on viewer. Any idea? This
is my first time to use osg on my application, so I am not sure whether my
code is crroect.
Clement
________________________________________
From: [email protected]
[[email protected]] On Behalf Of J.P. Delport
[[email protected]]
Sent: Wednesday, 20 July 2011 1:00 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] How to update image data
Hi,
are you calling setImage only once? Are you using osg::Image::NO_DELETE?
How are you changing the data? Do you get the first image correctly?
jp
On 19/07/2011 16:09, [email protected] wrote:
> I tried, but it is no update. Is there a function from viewer to update the
> screen?
> ________________________________________
> From: [email protected]
> [[email protected]] On Behalf Of J.P. Delport
> [[email protected]]
> Sent: Tuesday, 19 July 2011 11:39 PM
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] How to update image data
>
> see the dirty() function
>
> On 19/07/2011 14:10, [email protected] wrote:
>> Hi,
>>
>> I used the Image to display data. I used setImage and assigned I
>> defined unsigned char pointer. My question is how to let viewer to know to
>> update the view after completed updated the data into image.
>>
>>
>> Regards,
>> Clement
>> _______________________________________________
>> osg-users mailing list
>> [email protected]
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
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