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I'm trying to implement color picking with FBO. I have multisampled FBO (fbo[0]) which I use to render the scene and I have non multisampled FBO (fbo[1]) which I use for color picking. The problem is: when I try to read pixel data from fbo[1] everything goes well until glReadPixels call which sets GL_INVALID_OPERATION flag. I've checked the manual and can't find the reason why. The code to create FBO: glBindRenderbuffer(GL_RENDERBUFFER, rbo[0]); glRenderbufferStorageMultisample(GL_RENDERBUFFER, numSamples, GL_RGBA8, resolution[0], resolution[1]); glBindRenderbuffer(GL_RENDERBUFFER, rbo[1]); glRenderbufferStorageMultisample(GL_RENDERBUFFER, numSamples, GL_DEPTH24_STENCIL8, resolution[0], resolution[1]); glBindRenderbuffer(GL_RENDERBUFFER, rbo[2]); glRenderbufferStorage(GL_RENDERBUFFER, GL_R32UI, resolution[0], resolution[1]); glBindRenderbuffer(GL_RENDERBUFFER, rbo[3]); glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, resolution[0], resolution[1]); glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo[1]); glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbo[3]); glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo[2]); OGLChecker::checkFBO(GL_DRAW_FRAMEBUFFER); glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo[0]); glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbo[1]); glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo[0]); OGLChecker::checkFBO(GL_DRAW_FRAMEBUFFER); My checker stays silent so the FBOs are complete. Next the picking code glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo[1]); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); // bla, bla, bla // do the rendering unsigned int result; glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0); glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo[1]); int sb; glReadBuffer(GL_COLOR_ATTACHMENT0); glBindBuffer

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