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I think you should look into Molecular Dynamics software. GROMACS is open source and capable of doing a simulation like the one in the video. Disadvantages: Installation on Windows is tricky, lots of learning to get started (no GUI, long text files…) you need an extra programm to view your output as video… Advantages: Very flexible: Differert Algorithms ...
Your video is appropriate, the sun is in place and all the rest, including the fascinating scenery. Remember, if you're thinking of adding anything else, do not move the object hitting the sun, whatsoever. The sun's gravity is unimaginably powerful, so making bouncing effects would seem unrealistic. Also, as the sun has strong heat, (I know you mentioned ...
Gradually, after one got familiar and professional in optics, free softwares are not that useful. Besides Zemax, CODE V and OSLO are two industrial and very powerful geometrical-optics design softwares.
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