Hello! Faced a strange problem when I decided to render the background (skybox) after rendering the scene. There are 4 textures attached to the framebuffer. First I fill them out when rendering the scene. After, I fill in the 0th and 2nd during the rendering of the skybox.

uint colorAttachment02[3] = { GL_COLOR_ATTACHMENT0, GL_NONE, GL_COLOR_ATTACHMENT2 };
uint colorAttachment0123[4] = {
    GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3
};
...
    glDrawBuffers(4, colorAttachment0123);
    glUseProgram(cs.programId);

    // sending lamps parameters to fragment shader
	sendLampsData();

    // drawing
    for (size_t i = 0; i < MODELS_COUNT; i++) drawModel(models[i]);
	for (size_t i = 0; i < POINT_LAMPS_COUNT + DIR_LAMPS_COUNT; i++) drawModel(lamps[i]);

    // render skybox
    glDepthFunc(GL_LEQUAL);
    glDrawBuffers(3, colorAttachment02);
    useShaderProgram(skyboxShader.programId);
    glUniformMatrix3fv(skyboxShader.matView, 1, GL_FALSE, glm::value_ptr(glm::mat3(camera.getViewMatrix())));
    setMat4(skyboxShader.matTransform, camera.getProjectionMatrix() * glm::mat4(glm::mat3(camera.getViewMatrix())));
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_CUBE_MAP, skybox);
    skyboxRenderer.render();
    glDepthFunc(GL_LESS);
...
    // another fbo...

The strange thing is that if do not reset to the initial buffers (that is, add the line glDrawBuffers(4, colorAttachment0123)), then with a sharp turn of the camera, something like the previous frame will be noticeable...

Why is this happening? Thank you in advance for your answers.

Hard to tell with that little info. To me it looks like you're simply not clearing a buffer correctly, most likely the one for the lighting.

50 minutes ago, Magogan said:

Hard to tell with that little info. To me it looks like you're simply not clearing a buffer correctly, most likely the one for the lighting.

The strange thing is that if I render the skybox before the scene, then this will not happen

My bet is on not clearing (all the attachments) too. The Skybox overwrites the whole buffer, i assume.