Someone asked, just a day or two ago, how to make a baseball seam. 
Funny they should ask.  Seems like someone asks once every 3 or 4
months, and so I wrote up a web page about it.   This page shows some
simple equations to describe the curve that a baseball seam follows, and
shows a sample image along with complete source code.

See this at

http://www.newcolor.com/darenw/dswpov/bbseam.html


-- 

Daren Scot Wilson
Member, ACM
dar### [at] pipelinecom
www.newcolor.com
---
"If you saw the poisons we put on them you wouldn't ask that
 question. You'd never eat another ..."
What is this farmer talking about?
Find out at http://www.ratical.com/LifeWeb/Erthdnce/chapter21.html

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Looks very nice.  Unfortunately, you have done a good job on softball seams.
Baseball (hardball) seams do not project out of the surface of the ball.
They also are sewed in a fashion so there are no extruding lumps between
threads.  Perhaps if you could turn your softball seams inside out you might
get a better fit with a hardball.

Jim


Daren Scot Wilson wrote in message <35E### [at] pipelinecom>...
>Someone asked, just a day or two ago, how to make a baseball seam.
>Funny they should ask.  Seems like someone asks once every 3 or 4
>months, and so I wrote up a web page about it.   This page shows some
>simple equations to describe the curve that a baseball seam follows, and
>shows a sample image along with complete source code.
>
>See this at
>
>http://www.newcolor.com/darenw/dswpov/bbseam.html
>
>

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> 
> Baseball (hardball) seams do not project out of the surface of the ball

True, and I don't care.  It was the curve that the seam follows that I
wanted to describe.  How to make that curve look like a seam is *your*
job! <g>

Note that there were a couple of typos in the web page, to be fixed by
midnight.   When I cut and pasted the .pov source, I forgot that it
included < and > which HTML takes a special interest in.  

-- 

Daren Scot Wilson
dar### [at] pipelinecom

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Nice work!  I think Mr. Kress missed the point of your original posting, but
I for one appreciate your sharing this with the group.

One teensy request though, would you mind providing a version of your
bbseam.pov for the generic POV renderer? No offense, but I try to avoid
customizing my POV environment unless its a feature I want to commit to, and
continue to maintain as I upgrade to newer POV releases.

Thanks,
-- Dave

Daren Scot Wilson wrote in message <35E43721.4DC45F4E@pipeline.com>...
>>
>> Baseball (hardball) seams do not project out of the surface of the ball
>
>True, and I don't care.  It was the curve that the seam follows that I
>wanted to describe.  How to make that curve look like a seam is *your*
>job! <g>
>
>Note that there were a couple of typos in the web page, to be fixed by
>midnight.   When I cut and pasted the .pov source, I forgot that it
>included < and > which HTML takes a special interest in.
>
>--
>
>Daren Scot Wilson
>dar### [at] pipelinecom

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Gee, just checked out your site.  I didn't picture you as looking like that
(I never was much good at imagining what people look like!)

On to the point!  I think it's great that you've posted the code for the
curve.  It's cool!!!  Thanks for doing everyone here a great favour!  Thanks
for sharing it with us!  (Us, meaning: me, young and naive to the rest of
the world :-)

--
Lance Birch
http://come.to/the.zone
Remove the smiley to e-mail.

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> would you mind providing a version of your
> bbseam.pov for the generic POV renderer?

Well, OK.  I can cut the dispersion stuff and provide that file as well.
Gimme a day or two.

-- 
Daren Scot Wilson
Member, ACM
dar### [at] pipelinecom
www.newcolor.com
--

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Thanks - I know I'm being a wimp!

Daren Scot Wilson wrote in message <35E5B6CE.7ABB8CEC@pipeline.com>...
>> would you mind providing a version of your
>> bbseam.pov for the generic POV renderer?
>
>Well, OK.  I can cut the dispersion stuff and provide that file as well.
>Gimme a day or two.
>
>--
>Daren Scot Wilson
>Member, ACM
>dar### [at] pipelinecom
>www.newcolor.com
>--

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Thanks for the gush, Lance!   It was a fun, and quick, math project, but
took a lot longer than I was planning on to get the POV code written. 
I'm addicted to tweaking the lighting forever.

Any other space curves or surface anyone wants to see?   Is there a web
page devoted to interesting curves, etc. aimed at computer graphics
geeks?   I'll be happy to start one, if I can gather enough material for
it.

BTW, you may have noticed the POV code had a couple extra parameters not
explained in the web page's text.  They're there just for you to tweak
and see what comes out - have fun!

For anyone who tuned in late, the baseball seam curve is at
http://www.newcolor.com/darenw/dswpov/bbseam.html

---
Daren Scot Wilson
Member, ACM
dar### [at] pipelinecom
www.newcolor.com
---

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>Any other space curves or surface anyone wants to see?   Is there a web
>page devoted to interesting curves, etc. aimed at computer graphics
>geeks?   I'll be happy to start one, if I can gather enough material for
>it.
>
>Daren Scot Wilson


One nice gallery of mathematical surfaces that i've found is at
http://www.uib.no/People/nfytn/mathgal.htm

Adrian Pederson

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Wow, great idea!  I hadn't thought of it until you mentioned it, but this
would be a great application for peano, dragon, etc. curves. These are
considered "space filling" curves, which would make really interesting
textures when applied to a sphere. Although its easy to create images of
these curves, then texture-map them over the sphere. But by generating them
mathematically, you would a) guarrantee that the texture is seamless, and b)
be constructed of interesting objects, as you've demonstrated in your
example image.

Daren Scot Wilson wrote in message <35E5BC91.7EB2FC9A@pipeline.com>...
>Any other space curves or surface anyone wants to see?   Is there a web
>page devoted to interesting curves, etc. aimed at computer graphics
>geeks?   I'll be happy to start one, if I can gather enough material for

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