On Tuesday, June 23, 2015 at 2:01:51 AM UTC-4, vdelecroix wrote:
>
> 1) Remove var('t'): this is to declare a *symbolic (mathematical)* 
> variable and is completely useless here 
>
> 2) replace "frame_list = frame_list + Pall" with "frame_list.append(Pall)" 
>
>
> Thank you very much.
>

Two problems remain:

1)  Three of the points are constant, yet all of the points in the 
animation move.  The origin is moving!  How do I stop that?

2)  How do I change the point of view?  The default one is not good.

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