I would like to define a curve which I can sweep out around the y-axis,
almost like a lathe object. However, I'd also like to change the curve at
various angles about the Y-axis. I don't believe this capability currently
exists. Might this be a future capability, or does a patch add this?

Jon

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In article <3856a988@news.povray.org>, "Jon S. Berndt" <jsb### [at] hal-pcorg> 
wrote:

> I would like to define a curve which I can sweep out around the y-axis,
> almost like a lathe object. However, I'd also like to change the curve at
> various angles about the Y-axis. I don't believe this capability currently
> exists. Might this be a future capability, or does a patch add this?

Hmm, using a 3d spline(with angle for the 3rd dimension) to control the 
points of the spline-interesting idea. I think it might be very 
difficult to write this as a patch, though.
However, it would be possible to write a macro to generate a mesh, using 
one of the spline patches would make that a lot easier.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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Chris Huff <chr### [at] yahoocom> wrote in message news:chrishuff_99-

> In article <3856a988@news.povray.org>, "Jon S. Berndt" <jsb### [at] hal-pcorg>
>
> > I would like to define a curve which I can sweep out around the y-axis,
> > almost like a lathe object. However, I'd also like to change the curve
at
> > various angles about the Y-axis. I don't believe this capability
currently
> > exists. Might this be a future capability, or does a patch add this?

>
> Hmm, using a 3d spline(with angle for the 3rd dimension) to control the
> points of the spline-interesting idea. I think it might be very
> difficult to write this as a patch, though.
> However, it would be possible to write a macro to generate a mesh, using
> one of the spline patches would make that a lot easier.

For now, I will probably create the surface in either smooth_triangle
sections, or a conglomeration of panels, or something...

I'm still thinking about it.

Jon

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Jon S. Berndt <jsb### [at] hal-pcorg> wrote:
> I would like to define a curve which I can sweep out around the y-axis,
> almost like a lathe object. However, I'd also like to change the curve at
> various angles about the Y-axis. I don't believe this capability currently
> exists. Might this be a future capability, or does a patch add this?

Perhaps Daniele Varrazzo's Striscia can help
(http://members.xoom.com/dvarrazzo) with this sort of extrusion modelling?
Otherwise bicubic patches offer the advantage of small file sizes and high
quality, whether hand coded or created using sPatch/Moray, etc.

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On Wed, 15 Dec 1999 12:39:40 +1000, Chris Colefax wrote:
>Jon S. Berndt <jsb### [at] hal-pcorg> wrote:
>> I would like to define a curve which I can sweep out around the y-axis,
>> almost like a lathe object. However, I'd also like to change the curve at
>> various angles about the Y-axis. I don't believe this capability currently
>> exists. Might this be a future capability, or does a patch add this?
>
>Perhaps Daniele Varrazzo's Striscia can help
>(http://members.xoom.com/dvarrazzo) with this sort of extrusion modelling?
>Otherwise bicubic patches offer the advantage of small file sizes and high
>quality, whether hand coded or created using sPatch/Moray, etc.

As well as the advantage of being intuitive to specify parameters for by hand,
if you use bezier splines for the curves that define the object.

-- 
These are my opinions.  I do NOT speak for the POV-Team.
The superpatch: http://www2.fwi.com/~parkerr/superpatch/
My other stuff: http://www2.fwi.com/~parkerr/traces.html

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