Most structure from motion or monocular SLAM algorithms use some kind of feature tracking and then estimate a dense reconstruction after they optimize the locations of all the cameras and all the features.<p>But it&#x27;s not the only way. There&#x27;s one notable alternative method, which is LSD-SLAM: <a href="https:&#x2F;&#x2F;github.com&#x2F;tum-vision&#x2F;lsd_slam" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;tum-vision&#x2F;lsd_slam</a><p>In general, it&#x27;s extremely hard to get good quality models from a cellphone camera. Believe me, thousands of innovative researchers are trying their best to make it better.