"Warp" <war### [at] tagpovrayorg> wrote in message
news:3d87ea2f@news.povray.org...
>
>   It shouldn't be too difficult to make a macro which creates that kind
> of surface as a mesh using the two splines. (It would probably render 10
> times faster as a mesh, as well.)
>

Thanks for the idea!

 In order to be 10 times faster, would you have to "store" the coordinates
of the mesh first as an INC or would I lose speed if it were "calculated"
anew for each frame of an animation?

The application is that I want to make a railroad.   I want to make the
rails, and want to identify the path of the rails with a spline.  The
question then is what to make it out of:   a sphere sweep seems
impractically slow in parsing/rendering, especially if it's "big".

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