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Need help with vectors, angles, etc please

  1. Nov 17, 2006 #1
    I have a problem that I have no way of solving on my own. I would like to know how to move a 3-dimensional object long the surface of a 3-D sphere and have it move in the direction it is facing, relative to the surface. Can someone please help me? I am not very good at math but am trying. What I know so far is very basic vector math, like sine/cosine, angles between vectors etc. I would really appreciate any help you could give me.
  2. jcsd
  3. Nov 17, 2006 #2
    Can you define your problem better? Without a better describtions of your system and what you really want... I'd look at it in spherical cooridinates... in this coordinate system the radius r would not be allowed to change, but theta (angle describing where you are in lattitude from north to south pole, allowed to be from 0 to pi) and phi (describing where you are in longitude, allowed to vary from 0 to 2pi) are allowed to change.

    This system is easily converted into x/y/z (Cartesian) coordinates if you choose.
  4. Nov 18, 2006 #3
    Thank you for trying to help me. I finally figured it out :)
    Last edited: Nov 18, 2006
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