[Paraview] Camera Animation - Interpolate or Path

[Terry Jordan]

I have tried using both these modes to create an animated camera that will zoom into the top section of a riser, then pan down, and then zoom back out.  Using interpolate I can easily set the keyframes but the interpolation appears to not be linear.  Is there anyway to make it linear?  Using the path I can pare the spline down to 4 points and place them in the appropiate location, but the spline is not linear.  Is there anyway to make the spline linear?
 
Both have a similar problem, and I don't see anyway to achieve my objective.
 
Thanks in advance.
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