[Bf-committers] An easy to use damped spline
Mikhail Rachinskiy
wellmaderice at gmail.com
Thu Jan 1 19:09:05 CET 2015
Hi Campbell, I think by “Nurbs Weights” Ronan ment this:
http://wiki.blender.org/index.php/Doc:2.4/Manual/Modeling/Curves#Weight
Which is not working since 2.5
But (for me) this is not really an issue since Blender's control point
weight interpolation isn't nearly accurate anyway:
http://www.blender.org/forum/viewtopic.php?p=3426&sid=811ac0150dae2688cd55939d8410423f
I'd be happy if surfaces were completly removed from Blender (since they're
by fact useless) and developer concentraited on getting curves (both Bezier
and Nurbs) to a decent Maya/3dsMax level, and getting libs such as
openNURBS to be able to import nurbs as meshes in Blender (like Modo does).
How is the GSoC openNURBS integration project is going on by the way?
Haven't heard about it lately.
--
Regards,
Mikhail Rachinskiy
jewelcourses.com
rachinskiy.com
On Thu, Jan 1, 2015 at 5:02 PM, Campbell Barton <ideasman42 at gmail.com>
wrote:
> On Tue, Dec 30, 2014 at 12:41 AM, Ronan Ducluzeau <zeauron at gmail.com>
> wrote:
> > I just want to remind that currently nurbs weights are not working in
> > master since 2.5.
>
> Tested, they work for nurbs curves & surfaces, but rather you use the
> bug tracker if you found some case where they fail.
>
> > If someone is interested into improving Blender's nurbs; there is a lot
> to
> > do, anyways.
> >
> > 2014-12-29 1:47 GMT+01:00 Campbell Barton <ideasman42 at gmail.com>:
> >
> >> Heres a patch on Blender,
> >> Removed the restriction of power-of-2 curve resolution.
> >> https://developer.blender.org/P183
> >>
> >> However I don't see any significant advantage this offers over
> >> existing nurbs calculation method, even though its quite efficient, it
> >> would need to be extended to support different orders (currently
> >> hard-coded to order-4), cyclic curves, nurbs weights etc...
> >>
> >> Just posting the patch for reference if anyone likes to check on the
> code.
> >>
> >> On Mon, Dec 29, 2014 at 8:03 AM, Campbell Barton <ideasman42 at gmail.com>
> >> wrote:
> >> > Its available here:
> >> > http://download.blender.org/ftp/ton/dspline.pdf
> >> >
> >> > On Mon, Dec 29, 2014 at 7:28 AM, joe <joeedh at gmail.com> wrote:
> >> >> Do you have a link to a paper?
> >> >> On Sep 28, 2014 10:45 AM, "Fred" <f.harthoorn at ziggo.nl> wrote:
> >> >>
> >> >>> Hi Campbell Barton,
> >> >>>
> >> >>> The amount of interpolation dots is 2^i, at the start of the demo
> i =
> >> >>> 4 (16 dots)
> >> >>> if you change i = 7 (the limit in the demo) than there are 128
> >> >>> interpolation dots.
> >> >>>
> >> >>> if I had set the limit in the demo to 10 then 1024 interpolation
> dots
> >> >>> was possible.
> >> >>>
> >> >>> If the spline is used in a 3 dimensional space,
> >> >>> to compute an interpolated dot position takes: dim * 10 clock
> cycles
> >> =
> >> >>> 30 clock cycles.
> >> >>> I hope that it is fast enough.
> >> >>>
> >> >>> If you like to have a curve to the last plotted dot you have to put
> two
> >> >>> dots on each other at the end.
> >> >>> You will see that it is symmetrical again.
> >> >>>
> >> >>> Please change the number to 7 in the demo and you see a curved line
> in
> >> >>> stead of dots.
> >> >>>
> >> >>> Much more is possible with this spline because the first, second and
> >> >>> third derivative (parameterized ) of the curve
> >> >>> is available in real time.
> >> >>>
> >> >>> I think that much more can be invented with this spline technique.
> >> >>> I think that with some research tangent handles can be constructed
> as
> >> >>> well (if you like them?).
> >> >>> What I did in the demo was the most simple way of using it.
> >> >>>
> >> >>> The essence is: a 3th degree curve in two (x,y) or more directions
> is
> >> >>> differentiated three times, and then again integrated 3 times.
> >> >>> With floating point this is impossible , because it is not exact,
> the
> >> >>> curve runs away.
> >> >>> But with integer computing it is exact and the spline exact a 3th
> >> degree
> >> >>> curve.
> >> >>>
> >> >>> It can also be used in ten or more directions, but more then 3
> >> >>> dimensions (x,y,z) is not practical.
> >> >>>
> >> >>> Fred.
> >> >>> --------------------------------------
> >> >>> Fred schreef op 28-9-2014 om 18:30:
> >> >>> > That is in the demo the case, because I programmed that the first
> >> plot
> >> >>> > point is actually two points.
> >> >>> > the spline uses 4 points p0, p1, p2, p3 and the interpolation is
> >> >>> > between p1 and p2.
> >> >>> >
> >> >>> > Campbell Barton schreef op 28-9-2014 om 17:42:
> >> >>> >> Checked the test application, and not sure if this is intended
> but a
> >> >>> >> simple triangle has uneven distribution.
> >> >>> >>
> >> >>> >> see: http://www.graphicall.org/ftp/ideasman42/fred_curve.png
> >> >>> >>
> >> >>> >> On Mon, Sep 29, 2014 at 1:32 AM, Dan McGrath <
> >> danmcgrath.ca at gmail.com>
> >> >>> wrote:
> >> >>> >>> Cool, got them. Will take a look later. o/
> >> >>> >>>
> >> >>> >>> Dan
> >> >>> >>>
> >> >>> >>> On Sun, Sep 28, 2014 at 11:28 AM, Fred <f.harthoorn at ziggo.nl>
> >> wrote:
> >> >>> >>>
> >> >>> >>>> Ok, It is uploaded to the directory incoming
> >> >>> >>>>
> >> >>> >>>> Dan schreef op 28-9-2014 om 17:15:
> >> >>> >>>>> You could always upload it to our anonymous ftp via
> >> >>> download.blender.org
> >> >>> >>>>> (or ftp.blender.org) and put it into the incoming directory
> (use
> >> >>> passive
> >> >>> >>>>> mode). From there was can fetch the files via
> >> >>> >>>>> http://download.blender.org/ftp/incoming/
> >> >>> >>>>>
> >> >>> >>>>> Dan
> >> >>> >>>>>
> >> >>> >>>>> On Sun, Sep 28, 2014 at 11:05 AM, Fred <f.harthoorn at ziggo.nl>
> >> wrote:
> >> >>> >>>>>
> >> >>> >>>>>> Campbell Barton
> >> >>> >>>>>>
> >> >>> >>>>>> I have tried to send it but it is rejected. So send me an
> >> addres for
> >> >>> >>>>>> upload.
> >> >>> >>>>>>
> >> >>> >>>>>> fred
> >> >>> >>>>>>
> >> >>> >>>>>>
> >> >>> >>>>>> Campbell Barton schreef op 28-9-2014 om 16:51:
> >> >>> >>>>>>> Could the project files be posted to a public URL?, Id like
> to
> >> be
> >> >>> able
> >> >>> >>>>>>> to look into this. but probably wont have time over the
> coming
> >> >>> weeks.
> >> >>> >>>>>>>
> >> >>> >>>>>>> The main source file compiles for me with minor edits on
> >> >>> >>>>>>> Linux/FreePascal, but the demo relies on `Window` unit,
> which I
> >> >>> assume
> >> >>> >>>>>>> is provided by delphi/windows.
> >> >>> >>>>>>>
> >> >>> >>>>>>> On Mon, Sep 29, 2014 at 12:36 AM, Dan McGrath <
> >> >>> danmcgrath.ca at gmail.com
> >> >>> >>>>>> wrote:
> >> >>> >>>>>>>> Hey,
> >> >>> >>>>>>>>
> >> >>> >>>>>>>> Just save out the delphi project and zip it up and email it
> >> to me
> >> >>> >>>> direct
> >> >>> >>>>>>>> via email I guess (the mailing list wouldn't allow such a
> >> large
> >> >>> >>>>>>>> attachement). I was attempting to compile it on linux, so
> the
> >> >>> compiled
> >> >>> >>>>>>>> dll's wouldn't be of much use to me unfortunately.
> >> >>> >>>>>>>>
> >> >>> >>>>>>>> Thanks!
> >> >>> >>>>>>>>
> >> >>> >>>>>>>>
> >> >>> >>>>>>>> Dan
> >> >>> >>>>>>>>
> >> >>> >>>>>>>> On Sun, Sep 28, 2014 at 10:06 AM, Fred <
> f.harthoorn at ziggo.nl>
> >> >>> wrote:
> >> >>> >>>>>>>>
> >> >>> >>>>>>>>> Hi Dan,
> >> >>> >>>>>>>>>
> >> >>> >>>>>>>>> Of course I can send you the project.
> >> >>> >>>>>>>>> I have made two versions:
> >> >>> >>>>>>>>> 1) The spline is embedded in de demo:
> >> >>> >>>>>>>>> 2) The spline is an external .dll, de demo calls
> PSpline.dll
> >> >>> >>>>>>>>>
> >> >>> >>>>>>>>> Which one do you prefer?
> >> >>> >>>>>>>>>
> >> >>> >>>>>>>>> Fred.
> >> >>> >>>>>>>>> ----------------
> >> >>> >>>>>>>>>
> >> >>> >>>>>>>>>
> >> >>> >>>>>>>>>
> >> >>> >>>>>>>>> Dan McGrath schreef op 28-9-2014 om 15:42:
> >> >>> >>>>>>>>>> So is/was Turbo Pascal (limited in features; eg: objects
> >> but no
> >> >>> >>>>>> classes)
> >> >>> >>>>>>>>>> and FreePascal+Lazarus (supports almost everything Delphi
> >> does
> >> >>> >>>> still?
> >> >>> >>>>>>>>>> http://wiki.freepascal.org/Lazarus_For_Delphi_Users).
> >> >>> >>>>>>>>>>
> >> >>> >>>>>>>>>> Anyway, just thought it was neat to see code in pascal
> (an
> >> >>> elegant
> >> >>> >>>>>>>>>> language, imho). Curious though, why not just give the
> whole
> >> >>> delphi
> >> >>> >>>>>>>>> project
> >> >>> >>>>>>>>>> and resource files so your forms can be built etc.? The
> code
> >> >>> seems
> >> >>> >>>> to
> >> >>> >>>>>>>>>> compile with some modifications here, but without the {$R
> >> *.DFM}
> >> >>> >>>>>> (*.lfm
> >> >>> >>>>>>>>> in
> >> >>> >>>>>>>>>> fp), one would have to manually rebuild the form :(
> >> >>> >>>>>>>>>>
> >> >>> >>>>>>>>>>
> >> >>> >>>>>>>>>>
> >> >>> >>>>>>>>>> On Sun, Sep 28, 2014 at 8:55 AM, Fred <
> f.harthoorn at ziggo.nl
> >> >
> >> >>> wrote:
> >> >>> >>>>>>>>>>
> >> >>> >>>>>>>>>>> It's true, but Delphi is object oriented.
> >> >>> >>>>>>>>>>>
> >> >>> >>>>>>>>>>> Dan McGrath schreef op 28-9-2014 om 14:53:
> >> >>> >>>>>>>>>>>> Standard Pascal, Turbo Pascal, Freepascal, Delphi; same
> >> >>> language,
> >> >>> >>>>>>>>>>> different
> >> >>> >>>>>>>>>>>> dialect :)
> >> >>> >>>>>>>>>>>>
> >> >>> >>>>>>>>>>>> On Sun, Sep 28, 2014 at 8:43 AM, Fred <
> >> f.harthoorn at ziggo.nl>
> >> >>> >>>> wrote:
> >> >>> >>>>>>>>>>>>> Actually it is Delphi
> >> >>> >>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>> Dan McGrath schreef op 28-9-2014 om 14:35:
> >> >>> >>>>>>>>>>>>>> Pascal, with inline assembler to boot! \o/ :)
> >> >>> >>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>> On Sun, Sep 28, 2014 at 6:46 AM, Ton Roosendaal <
> >> >>> >>>> ton at blender.org>
> >> >>> >>>>>>>>>>> wrote:
> >> >>> >>>>>>>>>>>>>>> Hi,
> >> >>> >>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>> Fred told me he's not interested in getting
> involved,
> >> or
> >> >>> >>>> setting
> >> >>> >>>>>> up
> >> >>> >>>>>>>>> a
> >> >>> >>>>>>>>>>>>>>> project for his work.
> >> >>> >>>>>>>>>>>>>>> He's retired now and just thought we might be
> >> interested
> >> >>> in a
> >> >>> >>>>>>>>> research
> >> >>> >>>>>>>>>>>>>>> topic he did.
> >> >>> >>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>> I've copied files he sent to me here;
> >> >>> >>>>>>>>>>>>>>> http://download.blender.org/ftp/ton/
> >> >>> >>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>> It's a Dutch pdf and two pascal files.
> >> >>> >>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>> -Ton-
> >> >>> >>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>>
> >> --------------------------------------------------------
> >> >>> >>>>>>>>>>>>>>> Ton Roosendaal - ton at blender.org -
> >> www.blender.org
> >> >>> >>>>>>>>>>>>>>> Chairman Blender Foundation - Producer Blender
> >> Institute
> >> >>> >>>>>>>>>>>>>>> Entrepotdok 57A - 1018AD Amsterdam - The
> >> Netherlands
> >> >>> >>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>> On 28 Sep, 2014, at 9:28, Aditia A. Pratama wrote:
> >> >>> >>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>>> HI Fred,
> >> >>> >>>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>>> Can you record a screencast/video demo to show how
> it
> >> >>> works?
> >> >>> >>>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>>> Regards,
> >> >>> >>>>>>>>>>>>>>>> On Sep 28, 2014 2:14 PM, "Fred" <
> f.harthoorn at ziggo.nl
> >> >
> >> >>> wrote:
> >> >>> >>>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>>>> I forgot to say, I have a two dimensional demo but
> >> it is
> >> >>> >>>>>> working
> >> >>> >>>>>>>>> on
> >> >>> >>>>>>>>>>> a
> >> >>> >>>>>>>>>>>>>>>>> windows computer.
> >> >>> >>>>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>>>> Jacob Merrill schreef op 28-9-2014 om 02:07:
> >> >>> >>>>>>>>>>>>>>>>>> would this make it so you can record F-curves
> over
> >> time
> >> >>> >>>>>> better?
> >> >>> >>>>>>>>>>>>>>>>>> right now recording in the engine gets slower the
> >> >>> longer it
> >> >>> >>>>>> runs,
> >> >>> >>>>>>>>>>>>>>>>>> _______________________________________________
> >> >>> >>>>>>>>>>>>>>>>>> Bf-committers mailing list
> >> >>> >>>>>>>>>>>>>>>>>> Bf-committers at blender.org
> >> >>> >>>>>>>>>>>>>>>>>>
> >> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>>>> _______________________________________________
> >> >>> >>>>>>>>>>>>>>>>> Bf-committers mailing list
> >> >>> >>>>>>>>>>>>>>>>> Bf-committers at blender.org
> >> >>> >>>>>>>>>>>>>>>>>
> >> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>>>> _______________________________________________
> >> >>> >>>>>>>>>>>>>>>> Bf-committers mailing list
> >> >>> >>>>>>>>>>>>>>>> Bf-committers at blender.org
> >> >>> >>>>>>>>>>>>>>>>
> >> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>>>>>>>>>> _______________________________________________
> >> >>> >>>>>>>>>>>>>>> Bf-committers mailing list
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> >> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>>> _______________________________________________
> >> >>> >>>>>>>>>>>>>> Bf-committers mailing list
> >> >>> >>>>>>>>>>>>>> Bf-committers at blender.org
> >> >>> >>>>>>>>>>>>>>
> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>>> _______________________________________________
> >> >>> >>>>>>>>>>>>> Bf-committers mailing list
> >> >>> >>>>>>>>>>>>> Bf-committers at blender.org
> >> >>> >>>>>>>>>>>>>
> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>>>>>>>>
> >> >>> >>>>>>>>>>>> _______________________________________________
> >> >>> >>>>>>>>>>>> Bf-committers mailing list
> >> >>> >>>>>>>>>>>> Bf-committers at blender.org
> >> >>> >>>>>>>>>>>>
> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>>>>>>>
> >> >>> >>>>>>>>>>> _______________________________________________
> >> >>> >>>>>>>>>>> Bf-committers mailing list
> >> >>> >>>>>>>>>>> Bf-committers at blender.org
> >> >>> >>>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>>>>>>
> >> >>> >>>>>>>>>> _______________________________________________
> >> >>> >>>>>>>>>> Bf-committers mailing list
> >> >>> >>>>>>>>>> Bf-committers at blender.org
> >> >>> >>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>>>>>
> >> >>> >>>>>>>>> _______________________________________________
> >> >>> >>>>>>>>> Bf-committers mailing list
> >> >>> >>>>>>>>> Bf-committers at blender.org
> >> >>> >>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>>>>
> >> >>> >>>>>>>> _______________________________________________
> >> >>> >>>>>>>> Bf-committers mailing list
> >> >>> >>>>>>>> Bf-committers at blender.org
> >> >>> >>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>> _______________________________________________
> >> >>> >>>>>> Bf-committers mailing list
> >> >>> >>>>>> Bf-committers at blender.org
> >> >>> >>>>>> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>>
> >> >>> >>>>> _______________________________________________
> >> >>> >>>>> Bf-committers mailing list
> >> >>> >>>>> Bf-committers at blender.org
> >> >>> >>>>> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>>
> >> >>> >>>> _______________________________________________
> >> >>> >>>> Bf-committers mailing list
> >> >>> >>>> Bf-committers at blender.org
> >> >>> >>>> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>>>
> >> >>> >>> _______________________________________________
> >> >>> >>> Bf-committers mailing list
> >> >>> >>> Bf-committers at blender.org
> >> >>> >>> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >>
> >> >>> > _______________________________________________
> >> >>> > Bf-committers mailing list
> >> >>> > Bf-committers at blender.org
> >> >>> > http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>> >
> >> >>>
> >> >>> _______________________________________________
> >> >>> Bf-committers mailing list
> >> >>> Bf-committers at blender.org
> >> >>> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >>>
> >> >> _______________________________________________
> >> >> Bf-committers mailing list
> >> >> Bf-committers at blender.org
> >> >> http://lists.blender.org/mailman/listinfo/bf-committers
> >> >
> >> >
> >> >
> >> > --
> >> > - Campbell
> >>
> >>
> >>
> >> --
> >> - Campbell
> >> _______________________________________________
> >> Bf-committers mailing list
> >> Bf-committers at blender.org
> >> http://lists.blender.org/mailman/listinfo/bf-committers
> >>
> > _______________________________________________
> > Bf-committers mailing list
> > Bf-committers at blender.org
> > http://lists.blender.org/mailman/listinfo/bf-committers
>
>
>
> --
> - Campbell
> _______________________________________________
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