After looking into this further, it seemed that using glGetTexImage would be able to copy from a texture used as a render target (FBO). I have tried this only to be left with a black texture that never gets filled in. I know that function works by grabbing whatever texture is currently bound and returning its data. Using osg, the way to do this seemed to be the following:
osg::GraphicsContext *context = cam->getGraphicsContext(); osg::State *currentState = context->getState(); currentState->setActiveTextureUnit(0); currentState->applyTextureAttribute(0, mColorTexture); osg::ref_ptr<osg::Image> imageCapture = new osg::Image; imageCapture->readImageFromCurrentTexture(0, false); Unfortunately imageCapture is entirely filled with zeros. Anyone have some ideas or experience with this sort of thing? Thanks, Michael Guerrero ________________________________ From: Guerrero, Michael (CIV) Sent: Tuesday, April 01, 2008 2:23 PM To: OpenSceneGraph Users Subject: [osg-users] Getting the Image from a Texture2D used as a render target Hi, I'm trying to retrieve texture data that I have rendered from video memory back to main memory. I was initially hoping I could set up a render target as usual and then just call GetImage on the Texture2D but that doesn't work. Is there any easy way to do this? Thanks, Michael Guerrero
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