Help needed please
I am trying to calculate a set of regular distance points along the path of 
a conical spiral helix.
I need these to ultimately run a smooth camera around the scene I'm working 
on.

So if you have a general spiral helix  where
 R is the large radius
 r is the small radius
 H is the height
 n is the number of turns of the spiral

Anyone know
       a) How long is the total spiral ?
       b) How to calculate (x,y,z) for a given distance along the spiral 
(not angle) ?

If this is one of those blindingly obvious things, I'll apologise now.

Thanks Bob

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