Here is the result of my recent experimenting
with lathe macros (cubic_spline).

One macro generates the basic 2D lathe co-ordinates
(as in my postings to this news group 23. May 
and 25. May).

And then some other macros I made recalculates
these co-ordinates for further "twists" and does
all the necessary cuts, "tilts" and translations.

I believe that the re-calculated lathe co-ordinates 
can also be used and for prism shapes connected
to such lathe shapes. (I have not done this yet.)


Any comments or suggestions ?


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html


Btw: This twisted lathe has a "minor radius" 
defined by this function:

2/3*cos(4*Phi) - 1/3*sin(6*Phi - pi/2)

Post a reply to this message

Attachments:
Download 'lathemacro05_08.jpg' (35 KB)

Preview of image 'lathemacro05_08.jpg'

Remarkable object.  Is it made up of tens, hundreds, or thousands of
individual pieces?

Post a reply to this message

Bob Hughes wrote:
> 
> Remarkable object.  Is it made up of tens, hundreds, or thousands of
> individual pieces?

It's made of 10 individual lathe pieces.

:)


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

Post a reply to this message

Ah, okay, thanks.  I was going to guess that and then figured the spline might
be consuming more.

Bob

"Tor Olav Kristensen" <tor### [at] hotmailcom> wrote in message
news:3939AE63.538A520A@hotmail.com...
|
| > Is it made up of tens, hundreds, or thousands of individual pieces?
|
| It's made of 10 individual lathe pieces.
|
| :)

Post a reply to this message

very cool.  could be used for curved hand rails, snakes going over
terain, or something like that.  is it random? or do you have control?

Tor Olav Kristensen wrote:
> 
> Here is the result of my recent experimenting
> with lathe macros (cubic_spline).
> 
> One macro generates the basic 2D lathe co-ordinates
> (as in my postings to this news group 23. May
> and 25. May).
> 
> And then some other macros I made recalculates
> these co-ordinates for further "twists" and does
> all the necessary cuts, "tilts" and translations.
> 
> I believe that the re-calculated lathe co-ordinates
> can also be used and for prism shapes connected
> to such lathe shapes. (I have not done this yet.)
> 
> Any comments or suggestions ?
> 
> Tor Olav
> --
> mailto:tor### [at] hotmailcom
> http://www.crosswinds.net/~tok/tokrays.html
> 
> Btw: This twisted lathe has a "minor radius"
> defined by this function:
> 
> 2/3*cos(4*Phi) - 1/3*sin(6*Phi - pi/2)
> 
>   ------------------------------------------------------------------------
>  [Image]

Post a reply to this message

ryan constantine wrote:
> 
> very cool.  

Thank you.


> could be used for curved hand rails, snakes going over
> terain, or something like that.  is it random? or do you have control?

No it's not random. 

These are real lathe objects (in plain POV-Ray 
v3.1) where each is made up by many 2D control 
points (macros re-calculates these points for 
each lathe segment.)

Other macros cuts the lathe objects into segments 
and puts them into their positions.

I have control, but at the moment I have not 
finished the "front end" macro so it's a little 
bit cumbersome to gain exact control over the 
overall shape.


--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

Post a reply to this message

Yess! I'd like to see the finished macro for this. It's almost like a new
primitive!

Simen.

>Here is the result of my recent experimenting
>with lathe macros (cubic_spline).

Post a reply to this message

This would be really nice for roads, rails, etc. following a terrain
surface in height and slope (for example using megapov's hf_height_at
feature).  

I am waiting for a public version :)

Christoph

--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

Bob Hughes wrote:

> Ah, okay, thanks.  I was going to guess that and then figured the spline might
> be consuming more.

Yes. I had a feeling that you had already guessed the answer,
and that you just wanted to be sure.

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

Post a reply to this message

Simen Kvaal wrote:

> Yess! I'd like to see the finished macro for this. It's almost like a new
> primitive!

I have thought about doing this with torii for a long time.
But when I discovered how I could make a macro pass
an array of 2D points to a lathe, then I just had to try
it with lathes.

And when I saw that it worked, I said the same as you:
Yess!

It will take some time to finish the macro, so I'll post the
source code for the image as it is now.

And when I think that the macro set is finished, I'll post
again.


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

Post a reply to this message