Hallo
I want to grap a part of a scene.
At the moment:
x = ComplicateCalculationFor Y ...
y = ComplicateCalculationFor Y ...
glReadPixels(x, y, width, hight , GL_LUMINANCE,
GL_UNSIGNED_BYTE, memory);
now I want do the this with Offscreen Rendering in an FBO and used
sample 29 as base.
I want grab the rendert Texture from the FBO.
In pure OGL it is easy
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
glReadPixels();
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
this works fine
but in OSG this seems not to work
WindowPtr win = mgr->getWindow();
::fboVP->bind(win.getCPtr());
glReadPixels(0, 0, windowWidth-1, windowHeight-1, GL_LUMINANCE,
GL_UNSIGNED_BYTE, &pixels);
::fboVP->stop(win.getCPtr());
this produces: WARNING: FBO initalize pre OpenGL Error: invalid operation!
And the read Pixels are empty.
How can I Read the Pixels out of the FBO?
thx for help
eik
--
Dipl.-Inf. Eik Deistung
Multimediale Information + Präsentation
ZGDV e.V. E-Mail: [EMAIL PROTECTED]
(Computer Graphics Center) WWW : http://www.zgdv.de/
Joachim-Jungius-Str. 11 FAX : +49 381 446088
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