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On 7 Apr 2003 12:48:16 -0400, ingo <ing### [at] tag povray org> wrote:
> Tension, Continuity & Bias (TCB) or Kochanek-Bartels spline
> http://www.cubic.org/~submissive/sourcerer/hermite.htm#ma5.3
Done with detailed control over incoming and outgoing tangent vectors.
http://news.povray.org/ltad9voejvpq5fc1j1i0h5fq73t0l3a48t%404ax.com
ABX
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On 7 Apr 2003 12:48:16 -0400, ingo <ing### [at] tag povray org> wrote:
> > You mean akima_spline with requirement of 5 control points? Found it.
>
> Don't know about the 5 points. It is said that the Akima spline looks more
> "natural" or "hand drawn" than other splines.
Do you have any application with Akima spline available ? Can you try following
set:
0,<0,0>
1,<0,2>
2,<2,1>
3,<0,0>
4,<-1,2>
5,<-2,1>
6,<-1,-1>
7,<0,0>
For me it looks like
http://news.povray.org/4qmk9v8lqb1nf22p3nfgcbcpco85g53rib%404ax.com
but I hardly see the most left part of this spline smooth.
ABX
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in news:8umk9vghh0lg5p11tkanefo80rtldimhpl@4ax.com ABX wrote:
> Do you have any application with Akima spline available ?
I have none, sorry.
> For me it looks like
> http://news.povray.org/4qmk9v8lqb1nf22p3nfgcbcpco85g53rib%404ax.com
> but I hardly see the most left part of this spline smooth.
>
If you start drawing the spline somewhere else, is it still the last but
one point that gets a sharp bend, or is it always point <-1,-1>?
Ingo
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On 14 Apr 2003 10:47:42 -0400, ingo <ing### [at] tag povray org> wrote:
> > Do you have any application with Akima spline available ?
>
> I have none, sorry.
Fortunatelly I found solution:
http://news.povray.org/povray.binaries.images/31227/222064/akima_spline.png
ABX
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in news:cv7n9v427bnjhtkp6ff118fn2r497k7h4h@4ax.com ABX wrote:
> Fortunatelly I found solution:
>
That looks a lot better :)
Ingo
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On 7 Apr 2003 12:48:16 -0400, ingo <ing### [at] tag povray org> wrote:
> X-spline
basic_x_spline type
http://news.povray.org/d49r9v82qqo751ldl88ki24a71pbqlae3g%404ax.com
ABX
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On Wed, 16 Apr 2003 20:50:34 +0200, ABX <abx### [at] abx art pl> wrote:
> > X-spline
>
> basic_x_spline type
> http://news.povray.org/d49r9v82qqo751ldl88ki24a71pbqlae3g%404ax.com
extended_x_spline type
http://news.povray.org/povray.binaries.animations/31278/222366/extended_x_spline.mpg
http://news.povray.org/povray.binaries.images/31279/222367/extended_x_spline.png
ABX
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in news:odpt9vk3db9stlv425uh6ckjvie7qbn1sk@4ax.com ABX wrote:
> On Wed, 16 Apr 2003 20:50:34 +0200, ABX <abx### [at] abx art pl> wrote:
> extended_x_spline type
> http://news.povray.org/povray.binaries.animations/31278/222366/extende
> d_x_spline.mpg
> http://news.povray.org/povray.binaries.images/31279/222367/extended_x_
> spline.png
>
X_celent. Both scenes show pretty good what x-splines are capable of.
With all those new spline types I think it could be usefull to have an SDL
option to determine the type of a declared spline. Although I don't see an
immediate application for it now, it could be used to trigger switches in
a macro.
#declare SPL = spline {
general_x_spline
<...> ...
}
#declare TYPE = splinetype(SPL);
where splinetype returns a value or a string that identifies the type of
spline used.
Ingo
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On 17 Apr 2003 14:53:09 -0400, ingo <ing### [at] tag povray org> wrote:
> X_celent. Both scenes show pretty good what x-splines are capable of.
Now "general_x_spline" subject shows even more. Look into p.b.i and p.b.a.
> With all those new spline types I think it could be usefull to have an SDL
> option to determine the type of a declared spline.
I made something in that direction, too.
ABX
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in news:i9dqavkjvl22c72bet11m7hv91uoi7f09m@4ax.com ABX wrote:
A delayed reaction,
> Now "general_x_spline" subject shows even more. Look into p.b.i and
> p.b.a.
Saw the and I like what I saw :)
>> With all those new spline types I think it could be usefull to have
>> an SDL option to determine the type of a declared spline.
>
> I made something in that direction, too.
Great! thanks,
Ingo
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