So my reading on photogrammetry stresses the need to put movement in the photo to create parallax in the background that the software can use for alignment. But the Photoscan tutorial says that a model has to be masked to eliminated the background. Using manual tools like Bezier curves and arc tools on every photo? No way you can get them all identical. What if you have 500 photos? I am interested in making models for 3D printing. Can you use a green screen behind your original on a turntable and get the software to eliminate the background? A Manual masking of hundreds of photos would be ridiculously difficult.