the scanned models always have a messy mesh and are heavy to use in software, especially AR/VR World, I create the model from scratch to have a high-quality mesh with a clean UV Mapping.if you look that the photo service,the scanned model has already about 1 million faces but the the right one i created it has only about 4000 faces So it's a lot more effecient to use
_modified 3d Model.
_create model from pictures.
_UV Mapping