Fredrik Eriksson <fe79}--at--{yahoo}--dot--{com> wrote:
> On Fri, 20 Nov 2009 02:21:27 +0100, Warp <war### [at] tagpovrayorg> wrote:
> >
> >   I don't think making a perspective transformation to a set of vertex
> > points is any more expensive than rotating that same set of vertex  
> > points.

> It think it was. A single division probably took at least several hundred  
> cycles on hardware from that time.

  I don't understand why calculating a few hundreds of divisions would
take 2 minutes, even in the 70's.

  Perhaps if they used a completely naive division algorithm implemented in
an interpreted language like BASIC...

-- 
                                                          - Warp

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