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OpenGL Copy frame to texture

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Hello, I need to copy a part of my current frame to a texture. Therefore, I am using the OpenGL-calls: glEnable(GL_TEXTURE_2D); picture->render(); glBindTexture(GL_TEXTURE_2D, currentHsmMap->depthMap[counter]); glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 0,0,sizex,sizey,0); However, when I look into the texture it is empty.. Did I leave out any important commands? Thx a lot Icebraker

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