I used the P3A and the Orbit function of Litchi and manually triggered the photographs. You can change the orbit altitude as it is flying without stopping and starting mid-air, so it is possible to get the images at all of the altitude "rings" you need. Here is my first attempt at doing this and I used the demo of Photoscan, which is now timed out. I can't EVEN afford either this software nor Pix4D (I know there is a subscription) so I will need some real purpose and $$$.
Old Blue Point Barn by bobdenny - 3D model
Old Blue Point Barn by bobdenny - 3D model
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