ive been looking into this stuff for a while now so ill pass along some infos ive got from googling and trial and error. Since 3d packages don't compensate a camera for lens distortion, you need to make sure that the images you load in to a camera in your 3d app as a background image have been corrected for lens distortion too, otherwise the mesh wont match up with the camera image plane correctly. When getting the data back it is super useful to not only get an OBJ/textures of your model, but also a scene that has the cameras in, along with images corrected for lens distortion. My personal preference is to keep my work somewhat private, so I don't much like the idea of my data being sent off in to the cloud for processing, but I might just be old and jaded. The higher end Autodesk solution (Recap Pro) can do a great job - often stuff looks better from that than Agisoft - plus it supports GoPro (super wide) images now, so if you do photogrametry from drones, that is a plus. Autodesk 123D Catch is fine and free, however it doesn't use full resolution photographs, and will only give you an averagely dense mesh.
The #1 rule of photogrametry is that you can never have too many photos.Īs for software - Agisoft Photoscan is great, and honestly quite a steal at the price. Take WAY too many pictures (or think that you are taking way too many pictures). Use a tripod if you have to when taking shots. Shoot in good light and make sure your pictures are correctly exposed. Try to use a high F Stop, get as much in focus as possible. Even if you use a zoom and never touch the zoom dial, it can still move a little. I tend to avoid zoom lenses (Primes have higher quality for the price) - some photogrametry software prefers shots in a project to all be shot with the same camera/lens - a prime (non zoom) lens fixes that.
I personally like to use a 50mm lens on a full frame camera (Canon 5D Mk2). Almost any camera that has a decent sized sensor and a good lens should work fine.
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