Hi Robert,
thanks for the testing.
Now another question concerning FBOs. How can I realize the following
OpenGL code with openscenegraph? I have no idea how to read out the
texture at the COLOR_ATTACHMENT_0 of the fbo with openscenegraph,
because I don't have the id of the fbo object and I'm not familiar
enough with openscenegraph. I'm using the osgProducer::Viewer.
-------
// fbo and its render target (texture) has been setup -> "fboID" is the
fbo id.
unsigned char texContent [512 * 512 * 3];
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboID);
glReadBuffer(0x8CE0); // read out texture at COLOR_ATTACHMENT_0
glReadPixels(0, 0, 512, 512, GL_RGB, GL_UNSIGNED_BYTE, texContent); //
read out the pixel
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
-------
regards,
Oliver
Robert Osfield schrieb:
Hi Oliver,
Just tested things under Linux with Nvidia graphics and it works fine
on a single head.
Running the app with the --image over two graphics cards, with a
seperate context for each results in some syncronization issues when
using fbo, but perhaps this is to be expected, and the code probably
needs code with this in mind.
However, this isn't the problem you are seeing which quite likely is
down to an ATI driver or hardware issue, or perhaps some setting that
isn't be set, but on Nvidia defaults to something useful anyway. I'd
suspect the former though.
Robert.
On 7/4/06, Oliver Kutter <[EMAIL PROTECTED]> wrote:
Hi,
I had a look at the prerender example. When I started the example (using
the framebuffer) with
./osgprerender --fb --image dumptruck.osg
everything is fine. But when I use a framebuffer object, like this,
./osgprerender --fbo --image dumptruck.osg
the image has some artifacts, and I don't why? It seems, that the image
has only 256 colors. Has someone an idea? In our research group, we use
ATI graphics cards. Could it be, that NVidia cards has no such problems?
Here are some screenshots with and without the artifacts.
http://getwww.uni-paderborn.de/~kutter/artefacts.png
<http://getwww.uni-paderborn.de/%7Ekutter/artefacts.png>
http://getwww.uni-paderborn.de/~kutter/no_artefacts.png
<http://getwww.uni-paderborn.de/%7Ekutter/no_artefacts.png>
bye
Oliver
Robert Osfield wrote:
> Have a look at the osgprerender example, it has a code path that does
> the read back, the jist of it is to attach na osg::Image to the RTT
> CameraNode.
>
> On 6/30/06, Oliver Kutter <[EMAIL PROTECTED]> wrote:
>> Hi all,
>>
>> I'm a newbie in OpenSceneGraph.
>> I played around with the examples and I have a question concerning
>> the "osgfbo" example in osg-1.0. The cow is rendered into a texture
>> and that texture is mapped to the polygon. Now my question: The
>> texture is the render target of the framebuffer object. Is there any
>> way I can get an image of that texture and save it to harddisk?
>>
>> regards,
>> Oliver
>>
>> _______________________________________________
>> osg-users mailing list
>> [email protected]
>> http://openscenegraph.net/mailman/listinfo/osg-users
>> http://www.openscenegraph.org/
>>
> _______________________________________________
> osg-users mailing list
> [email protected]
> http://openscenegraph.net/mailman/listinfo/osg-users
> http://www.openscenegraph.org/
_______________________________________________
osg-users mailing list
[email protected]
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
_______________________________________________
osg-users mailing list
[email protected]
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
_______________________________________________
osg-users mailing list
[email protected]
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
