Hi mike,

Lars Petter in the thread: 'questions on parametric objects
and 3d splines'
is looking for your SweepSpline macro's. The zip file you
posted in november seems to be broken.

	Andrel

Mike Williams wrote:

> Wasn't it Tyler Eaves who wrote:
> 
> 
>>5. Lathe/prism hybrid. 
>>   It would be super handy to have an object that could be shaped 
>>   both in the x-z plane and have an 'edge shape'. I'm thinking of an
>>   implementation like this. First the object is built as a prism,
>>   then the edge shape is build at each point along the outside, 
>>   pointing along the surface normal. This would be really useful
>>   for all sorts of archetectural things, such as moldings, tabletops,
>>   etc, and I'm sure many organic things as well...
> 
> 
> While you're waiting for this to be implemented as a POV primitive, you
> can use a parametric isosurface (or, for speed, closely approximated
> with Ingo Janssen's param.inc). See my "Prismatic Lathe" example at
> <http://www.econym.demon.co.uk/isotut/splines.htm#plathe>
> 
> Or you could use my sweepspline.inc to approximate this with a mesh2.
> It's at the bottom of  <http://www.econym.demon.co.uk/isotut/more.htm>
> It uses three splines to specify the shape - one for the 2d curve that's
> used as a cross section, one for the 3d spline that the shape is swept
> along, and a 1d spline that describes how the scale varies along the
> length of the sweep.
> For a lathe/prism hybrid, the 3d spline would be a straight line.
> 
> 
>>7. Spline curves
>>   What I mean by this is taking a 2d curve, as used in a prism, etc,
>>   and drawing it 'along' a spline. Useful for making troughs, gutters,
>>   many organic things, etc, especially if a start scale and end 
>>   scale could be specified.
> 
> 
> While you're waiting for this to be implemented as a POV primitive, you
> can use my sweepspline.inc (see above).
> 
> If you only want to linearly interpolate between a start scale and end
> scale, then use a simple linear spline for the 1d "Waist" spline rather
> than a more complicated spline.
>

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