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Thread: References: Video Clips

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    Redone for a Better Grade Modeling Master The Draykin's Avatar
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    Last edited by The Draykin; February 28th, 2008 at 15:03. Reason: mo.

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    Redone for a Better Grade SublimeOne's Avatar
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    Quote Originally Posted by The Draykin View Post

    Hey, very cool find Mike.

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    Redone for a Better Grade Modeling Master The Draykin's Avatar
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    http://esquivel3d.com

    Future member of the Brain Trust.

    Method Animator

  6. #6
    Digital Composite Rookie
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    Ahoy! These are some video studies of bouncing balls. These items were shot originally on campus by myself, Astrid, and Alejandra but when I got home to edit, I found our shot was too far away (Framing is important! lol).

    The timer counts seconds and then 30 frames per second, so 0;04;24 means 4 seconds and 24 frames (out of 30).

    Enjoy!

    Tennis Ball
    https://youtu.be/uAuNUydNe98

    Basket Ball
    https://youtu.be/TOaZDc-s4-M

    Bowling Ball
    https://youtu.be/FITtPRevsfw

    Golf Ball
    https://youtu.be/yTcH3PXEBQU

    Ping Pong
    https://youtu.be/6wQ39sv1-Go

    Racket Ball
    https://youtu.be/4NWLo8gltvo

  7. #7
    Digital Composite Rookie
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    I analyzed the frames and noticed a few things about bounces.

    The first is that a bouncing ball can be defined by the rate that it loses its height per bounce. In the case of a golf ball, it loses 1/6th of its height each bounce. The white numbers are measurements in pixels, just for relative measurement.

    Click image for larger version. 

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    I also noticed that each bounce is a shorter segment of the same bounce. I think this is due to gravity and downward acceleration being the same between bounces, and among different objects.

    Click image for larger version. 

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    I think this means that constructing a bounce is a matter of reducing an arc by the same fraction each time.


  8. #8
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    Here is the bowling ball bouncing approximately 50% lower each time
    Click image for larger version. 

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    Basketball bouncing 10% lower each time
    Click image for larger version. 

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    The ping pong ball is a little different, and it wasn't as consistent as the other balls. I think it's due to air resistance and being very light. Maybe there's less time for air resistance to act on it in the smaller bounces, so it loses less height.
    Click image for larger version. 

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    This is the ping pong ball also repeating the same arc between bounces.
    Click image for larger version. 

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