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A bit late for the sword of the week award, but this is
the result of the weekend's work.
Blade done in sPatch, guard is the intersection of a
cylinder and a heightfield and the hilt is CSG of
3 cylinders and 6 boxes.
Gail
--
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* http://www.rucus.ru.ac.za/~gail/ * Insert cup and press any key *
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Attachments:
Download 'Sword.jpg' (13 KB)
Preview of image 'Sword.jpg'
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Gail Shaw wrote:
>
> A bit late for the sword of the week award, but this is
> the result of the weekend's work.
>
> Blade done in sPatch, guard is the intersection of a
> cylinder and a heightfield and the hilt is CSG of
> 3 cylinders and 6 boxes.
>
> Gail
> --
> *******************************************************************
> * gsh### [at] monotixcoza * ERROR: COFFEE.COM not found *
> * http://www.rucus.ru.ac.za/~gail/ * Insert cup and press any key *
> *******************************************************************
> My Software never has bugs, It just develops random features
> *******************************************************************
>
> [Image]
It has a wicked look to it. The metallic finish is off a little but one
could let that go if they were on the wrong end of that point. Seriously
though it is a little too white and could use a little more of a silver
glint to it.
Personally I would bring the final curve at the tip up a little more
abruptly than it currently is and counter sharpen the top of the blade
for about 1/2 to 3/4 of an inch from the tip back towards the hilt.
See my poor diagram for an example.
This will give the blade two cutting edges at the tip for extra
penetrating power plus it adds structural strength to the tip region.
It also keeps the point from abruptly ending at a flat squared surface
which puts to much reliance on a thin unsupported edge. The counter
bevel relieves this by creating "V" shapes back to back forming a
diamond shape which is stronger than a pyramid or 3 point wedge shape.
Once initial penetration of the victim is achieved the single cutting
edge can finish without the aid of the four surface point. It is a common
arrangement with long knives and fine blades such as this and is hardly
noticeable from a distance. It is quite noticeable without it. It looks
nicely wicked as is but the shape of the tip offers poor utility and would
break easily if used for anything more the ceremonial dress or slicing
sausage and bread for dinner. If I had a scanner I would scan in some
images from a sworders catalogue I have here that shows the common blade
shapes and points for swords of this type. Maybe in a couple of months
I'll have one on line (sigh).
--
Ken Tyler
mailto://tylereng@pacbell.net
Post a reply to this message
Attachments:
Download 'blade.jpg' (7 KB)
Preview of image 'blade.jpg'
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I always thought that would be a _real_ accomplishment of sword-modelers,
would be the accuarate representation of a Katana. Probably the type whose
edge and back of blade followed the radius of different circles would be
easiest. However, the blades are actually very complex shapes, and the fact
that the metal is not uniform throughout the blade but is purposly hardened
to different crystalline structures in different parts of the blade makes
for some quite beautiful, and very hard to procedurally model!, textures.
And let's not even THINK about doing a wapped handle accuratly,and as far as
the orbate tsuaba got........ *shudder*
Still - it is probably _the_ sword modellers ultimate challenge. Someday
when I have a few months spare time, I may start pulling textbooks on
Japanese sword smithing off the shelf a give it a whirl, but not today.
The image? Damn close in any case :) Best approximation of that style of
blade I've seen I think :)
Post a reply to this message
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Charles Krause wrote:
>
> I always thought that would be a _real_ accomplishment of sword-modelers,
> would be the accuarate representation of a Katana. Probably the type whose
> edge and back of blade followed the radius of different circles would be
> easiest. However, the blades are actually very complex shapes, and the fact
> that the metal is not uniform throughout the blade but is purposly hardened
> to different crystalline structures in different parts of the blade makes
> for some quite beautiful, and very hard to procedurally model!, textures.
> And let's not even THINK about doing a wapped handle accuratly,and as far as
> the orbate tsuaba got........ *shudder*
>
> Still - it is probably _the_ sword modellers ultimate challenge. Someday
> when I have a few months spare time, I may start pulling textbooks on
> Japanese sword smithing off the shelf a give it a whirl, but not today.
>
> The image? Damn close in any case :) Best approximation of that style of
> blade I've seen I think :)
I have longed for the talent to accurately model an edged weapon. I have
a couple of small books on the subject, one for knives the other mostly
french cutlass and broad swords, and buy the occasional magazine off of
the rack when something catches my fancy.
The textures would be a bit of a challenge but I think I could master
that with little effort. What has had me stumped is how to hollow grind
a curving edge without leaving scratches of blemishes from the operation.
Some of the finest cutting blades in the world have what is called a hollow
grind above the cutting edge.
It forms a gully of sorts that is actually deeper than the majority of
the taped thickness of the bevel leading to the sharpened edge. The
advantage of the hollow grind for those curious to know is that when the
material that is being cut into passes the keen sharpened edge of the
cutting tool the material has a very smooth edge that adheres to the flat
smooth surface of the blade. This causes jerky or start and stop cutting
sessions and is a nuisance.
The hollow ground blade limits this by allowing the material to start to
heal back towards itself and then is quickly angled outward breaking its
suction like grip to the surface of the blade. This action gives much
smoother cutting through materials much thicker than the height of the
blade and serves as a self cleaning process as well. In consequence this
reduced build up of compounds that will foul the cutting operation leading
to successful cutting operation with a repeatability that is refreshing.
The hollow grind operation is relatively easy on the right machining
equipment and the odd scratch of two can be eliminated by buffing it out
on a buffing and polishing wheel. Pov csg operations are not quite as
forgiving in this regard and forming a uniform indent in a curved surface
is uniquely challenging. Added to that is the limitation of having no way
to polish out any blemishes left by csg operations as you would be capable
of in the real world.
I think that I will continue to evaluate my thoughts about this for a
while before thinking about thoughtfully attempting a well thought out
approach to this thought provoking yet stimulating little problem.
--
Ken Tyler
mailto://tylereng@pacbell.net
Post a reply to this message
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Charles Krause wrote in message <370a0952.0@news.povray.org>...
>The image? Damn close in any case :) Best approximation of that style of
>blade I've seen I think :)
>
Thanks. I think the only way to do a katana blade accurately would
be to use something like sPatch to model it and uv-mapped material maps
to texture. If I need a highly detailed katana (the pic was medium-low
detail)
I may play with the idea.
Gail
*******************************************************************
* gsh### [at] monotixcoza * ERROR: COFFEE.COM not found *
* http://www.rucus.ru.ac.za/~gail/ * Insert cup and press any key *
*******************************************************************
My Software never has bugs, It just develops random features
*******************************************************************
Post a reply to this message
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Hmm, i didn't realise your fashination for killing things... Now I see.. :-)
--
//Spider
[ spi### [at] bahnhofse ]-[ http://www.bahnhof.se/~spider/ ]
What I can do and what I could do, I just don't know anymore
"Marian"
By: "Sisters Of Mercy"
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Well, you won the award. A great sword.
--
//Spider
[ spi### [at] bahnhofse ]-[ http://www.bahnhof.se/~spider/ ]
What I can do and what I could do, I just don't know anymore
"Marian"
By: "Sisters Of Mercy"
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Spider wrote in message <370A65D0.7C4CF71D@bahnhof.se>...
>Hmm, i didn't realise your fashination for killing things... Now I see..
:-)
>
>
<grin> now you know.
Where did you say you lived.... <g>
Gail
*******************************************************************
* gsh### [at] monotixcoza * ERROR: COFFEE.COM not found *
* http://www.rucus.ru.ac.za/~gail/ * Insert cup and press any key *
*******************************************************************
My Software never has bugs, It just develops random features
*******************************************************************
Post a reply to this message
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Boy doesn't it just put a real crimp in your day when sword doesn't come out of
your victim cleanly:-)
Ken wrote:
> Charles Krause wrote:
> >
> > I always thought that would be a _real_ accomplishment of sword-modelers,
> > would be the accuarate representation of a Katana. Probably the type whose
> > edge and back of blade followed the radius of different circles would be
> > easiest. However, the blades are actually very complex shapes, and the fact
> > that the metal is not uniform throughout the blade but is purposly hardened
> > to different crystalline structures in different parts of the blade makes
> > for some quite beautiful, and very hard to procedurally model!, textures.
> > And let's not even THINK about doing a wapped handle accuratly,and as far as
> > the orbate tsuaba got........ *shudder*
> >
> > Still - it is probably _the_ sword modellers ultimate challenge. Someday
> > when I have a few months spare time, I may start pulling textbooks on
> > Japanese sword smithing off the shelf a give it a whirl, but not today.
> >
> > The image? Damn close in any case :) Best approximation of that style of
> > blade I've seen I think :)
>
> I have longed for the talent to accurately model an edged weapon. I have
> a couple of small books on the subject, one for knives the other mostly
> french cutlass and broad swords, and buy the occasional magazine off of
> the rack when something catches my fancy.
> The textures would be a bit of a challenge but I think I could master
> that with little effort. What has had me stumped is how to hollow grind
> a curving edge without leaving scratches of blemishes from the operation.
> Some of the finest cutting blades in the world have what is called a hollow
> grind above the cutting edge.
> It forms a gully of sorts that is actually deeper than the majority of
> the taped thickness of the bevel leading to the sharpened edge. The
> advantage of the hollow grind for those curious to know is that when the
> material that is being cut into passes the keen sharpened edge of the
> cutting tool the material has a very smooth edge that adheres to the flat
> smooth surface of the blade. This causes jerky or start and stop cutting
> sessions and is a nuisance.
> The hollow ground blade limits this by allowing the material to start to
> heal back towards itself and then is quickly angled outward breaking its
> suction like grip to the surface of the blade. This action gives much
> smoother cutting through materials much thicker than the height of the
> blade and serves as a self cleaning process as well. In consequence this
> reduced build up of compounds that will foul the cutting operation leading
> to successful cutting operation with a repeatability that is refreshing.
> The hollow grind operation is relatively easy on the right machining
> equipment and the odd scratch of two can be eliminated by buffing it out
> on a buffing and polishing wheel. Pov csg operations are not quite as
> forgiving in this regard and forming a uniform indent in a curved surface
> is uniquely challenging. Added to that is the limitation of having no way
> to polish out any blemishes left by csg operations as you would be capable
> of in the real world.
>
> I think that I will continue to evaluate my thoughts about this for a
> while before thinking about thoughtfully attempting a well thought out
> approach to this thought provoking yet stimulating little problem.
>
> --
> Ken Tyler
>
> mailto://tylereng@pacbell.net
Post a reply to this message
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Thomas Lake wrote in message <370B317C.F62CF3DA@home.com>...
>Boy doesn't it just put a real crimp in your day when sword doesn't come
out of
>your victim cleanly:-)
>
Yeah - that's why the steretypical 'killing stroke' with a Katana (and NOT
because of HIGHLANDER, thankyouverymuch, it has historical basis) is to just
lop off the head with a single stroke :P
:)
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