Most of the time arcs are figures 8's or they are in a wave pattern.
So I guess now is a good time to practise my arcs in these patterns.
incidentall there is a great tool in maya that im continually shocked to read of ppl not knowing about still. Its called the motion trail. Simply select your object you are animating, go to animate and create motion trail. Automatically you will see the arc of your selected object. One other object im finding very useful lately is the ghost selection object. You can set the amount of frames prior to and after the frame you are on and see where the object is on those frames. Its a great way to figure out your spacing and plot your arcs. It will work interactively with you as you pull points around in the graph editor as well. Great tool!
First a circular arc. ( you can see the motion trail working here)
All I have done is set a key at 1 and 25 the same. set a key on 13 the opposite. set a key on 7 and 19 the opposite again and splined it. And you pretty much get a perfect circle. So if you are blocking in a hand doing a circle arc you know how its done. frame one = 5y frame 25= 5 y frame 13 = 5y. frame 7 = -5x frame 19 = +5x and just spline it up. This is what you get.
Figure 8 now.
same formula as before pretty much. Just a couple more keys in the y axis and you have a figure 8.
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