[vtkusers] Animation of a growing curve

[Maksim Surov]

Hi, all. I'd like to animate a phase trajectory of DE such that in each
moment of time I add a small chunk to the curve. It should look like a
"growing curve".

I guess there are 2 ways:
1. Generate all the points by vtkParametricSpline, draw the curve, and set
opacity = 0; in each time moment change opacity for a part of the curve
2. Generate a new curve, adding one new point to the spline curve.

Anyway these look ugly for me.


-- 
*Best regards, *
*Maksim Surov*
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