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carlk

"Reversibility", 50-second physics video

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  • Two years ago, I got help in the Xpresso forum here and learned how to reverse the direction of dynamic objects on a given frame. I just got around to finishing that video:

    https://www.youtube.com/watch?v=r2ye8JtNMFQ&list=PLyBBVRUm1CyScgmzqpLGiKqwM-BxaiCnE&index=1

     

    I created this 50-second physics video (& poem) to demonstrate the Principle of Reversibility. The principle makes this claim: if you could reverse the direction of billiard balls, they would re-form a triangle and spit out the cue ball – indistinguishable from reversing time! This video puts that prediction to the test (via a C3D modeling & physics simulation).

    In a Newtonian universe, what works for billiard balls works everything. So, if this works, it means our universe includes an UNDO button. [Best in HD]

     

    - Carl

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    Great job, it came out really well. Think I would have used coloured Pool balls rather than glass balls. That way you can see them rotating rather than just sliding as they appear to do here.

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    Very interesting, glad to see stuff like this. Good job! :smile:

    Thanks for sharing.

     

    Regards,

    Igor

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    Thanks all. The observation that the balls appear to slide is useful.

     

    I did have one visual joke that I left out. I was going to have a picture of me holding a GoPro (just a 2-D cutout) behind the virtual camera. I thought it would be funny if my reflection "mistakenly" appeared in the glass balls. I tested it a bit, but the reflection was so small that the joke didn't work.

     

    Now I'm thinking of making a stereoscopic VR version of the same video. Instead of VR 360 degrees (which seems really hard), I've been testing just doing 153 degrees. In a little test with Google Cardboard, this seemed to work pretty well and it seems to be about 100 times easier than stereo-360. Have others tried this?

     

    - Carl

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