I wish to help a teacher friend, who is co-ordinating children formations in the playground for a sports function at a free small-town school. Such as, forming the letter, K, forming a Hat etc, by positioning children in lines and vertices. After the children have made a formation, they would disperse or re-arrange to make another formation.
I need a software that gives the step-by-step, gradual or quick, transition from one picture to another picture, by serially numbering the positions of the students, as 1,2,3 and showing how the numbers/positions should change, in what order, to form the new image. I would prefer something small, open-source, portable, and for Windows, but that is not a strict criterion as much as the functional requirement itself. If the software does the job, we could put together the hardware/system requirements.
Side question : I do not know what are some google keywords or search phrases to find such software. I tried, position changing, image transition etc but the results are too broad to be useful. Let me know if I am missing that one great keyword that show such software.
Edit: From an SO chat hint 'Morphing', I ended up reading on Beier–Neely morphing algorithm, Blender, Simple Deform Bend Modifier etc, but they don't seem to give out the numbering positions etc. Another school does use such a tool, but couldn't contact.