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Thread: Circlish movement

  1. #1
    Guest

    Circlish movement

    Hello,
    I was wondering, whats the mats for making a circular movement? i need it to move in x,y,z, for example a sphere. Can anyone help?
    Thanx

  2. #2
    Senior Member Frequent Contributor
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    Re: Circlish movement

    You mean a bit like a planet orbiting????

  3. #3
    Guest

    Re: Circlish movement

    Exactly. Acytually, eliptic orbit. is there an equation?

  4. #4
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    Re: Circlish movement

    Sure.


    Look up "Mysterium Cosmographicum" and "Astronomia Nova", both by Johannes Keppler, published in 1596 and 1609 respectively.

  5. #5
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    Re: Circlish movement

    Originally posted by Alkakios3K:
    Hello,
    I was wondering, whats the mats for making a circular movement? i need it to move in x,y,z, for example a sphere. Can anyone help?
    Thanx
    rotate desired amount then translate distance = to radius.

    next frame, rotate a little more and then translate again.

    this is a very simple way to get the kind of movement you've described.



    [This message has been edited by chrisATI (edited 05-15-2001).]
    Christopher Oat
    ATI Research, Inc.
    3D Application Research Group

  6. #6
    Guest

    Re: Circlish movement

    Ok, thank you, it works.

  7. #7
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    Re: Circlish movement

    Some pretty complex 'mats' there Alkakios!

  8. #8
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    Re: Circlish movement

    The physics/maths behind the fact that planet's orbits are eliptcal isn't known so know equation will ever be correct but there are equations that simulate it- Empirial formulae they are called I think.
    Reality is for idiots only the best over come it!

  9. #9
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    Re: Circlish movement

    Actually, they physics behind the planets orbiting is pretty well known. It's called gravity.

    For calculating the orbit of one object around another object that we assume does not move, the "empirical formulas" are perfectly accurate.

    It's calculating the trajectories of multiple objects that are all exerting gravitational influences on one another that we can't do perfectly.

    j

  10. #10
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    Re: Circlish movement

    Originally posted by Tim Stirling:
    The physics/maths behind the fact that planet's orbits are eliptcal isn't known so know equation will ever be correct but there are equations that simulate it- Empirial formulae they are called I think.

    Uhm... did you miss my post? We've known about these equations for 400 years, and Kepler's laws are accurate to within a few seconds of arc.

    Oy.

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