Compared with bouncing ball exercise in Fundatmentals Animation

[Keswick Chow]

Hi Wayne,

After I completed the arching_bounce exercise.  I realized that there is a major difference between the two rigs.  While moving the ball to the left, the x channel becomes negative (which is expected) in arcing-bounce.  In the bouncing ball exercise (in Fundamentals Animation) the x channel becomes positive which I am confused?  The cameras are looking in similar direction and global coordinates x direction is positive to the right.  The most obvious difference is most obvious when view the two graphs in “Graph Editor”.  I was going to include the Graph Editor screen dumps here but failed.  Hope you can explain how the position direction is controlled.

[Martin Bergwerf]

Hi Keswick;

That might be, because the Bones are oriented differently:

[Wayne Dixon]

Hi Kchow.
Martin is correct.  There’s a slight difference in the rigs.

One thing that you always need to remember is that the bones co-ordinates system is based on it’s orientation from its rest position (or edit mode).

This means, when you animate not all of the controls will be aligned with world space. Each control could have its own definition of “up”.

I hope that makes sense.

[Brandon Ruffin]

Dang, that is too interesting. Thanks @kchow for bringing this up, and thanks Wayne and Martin for clearing that up. It will be really helpful going forward here.

[Author]

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