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cube projection using opencv

Hello! I am trying to project a cube on a square of a chessboard, but my cube is not being projected on its place. I don't know what is the problem. If someone can help me, i can send him/her a video and the code. I tried a simple test: while moving the camera forward to the chessboard my z of the translation_vector is decreasing and while moving backward it's increasing, the chessboard is kept at the same position. I think it's a good sign. But while moving the camera to the right of the chessboard my x of the translation_vector is decreasing, i think this is a problem, but i don't know how to fix it. Thanks in advance!