[vtkusers] Visualize Velocity and Acceleration Vectors Together

[Joey Mukherjee]

>I draw arrows of velocity and acceleration vectors on the same image, but
>it's a mess.
>Any suggestions?

Don't draw all of them.  Use SetMaximumPoints and SetOnRatio to draw just some 
of the points.  

Joey

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+     Joey Mukherjee                 "The price of freedom is eternal      +
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