respect! pio
Piotr Arłukowicz, PhD, BFCT University of Gdańsk, Faculty of Mathematics, Physics and Informatics, Dept. of AI, Wit Stwosz 57, 80-952 Gdańsk, room 121, tel.: +48585232151, https://inf.ug.edu.pl/~piotao Polish Blender Course: http://polskikursblendera.pl/ [PL] 2014-12-27 11:39 GMT+01:00 Campbell Barton <[email protected]>: > Ugh, never mind, floating point splines aren't any trouble :) > > https://gitlab.com/ideasman42/fred-curve/blob/float_spline/pspline.c > > > > On Sat, Dec 27, 2014 at 9:23 PM, Campbell Barton <[email protected]> > wrote: > > Heres an initial port of the PSpline.pas to C, > > (single C file, prints 2d curve to stdout). > > > > https://gitlab.com/ideasman42/fred-curve/blob/HEAD/pspline.c > > > > This is the n-dimensional variant, but for the test it only prints 2d > values. > > > > My main concern with this method of calculating splines is it relies > > on integer values and bit-shifting. For Blender we would want it to > > calculate floating point values, I didnt investigate yet how well this > > method could be used with floats, would be interesting to check on > > next. > > > > On Mon, Sep 29, 2014 at 3:45 AM, Fred <[email protected]> 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 <[email protected]> > wrote: > >>>>> Cool, got them. Will take a look later. o/ > >>>>> > >>>>> Dan > >>>>> > >>>>> On Sun, Sep 28, 2014 at 11:28 AM, Fred <[email protected]> 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 <[email protected]> > 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 < > [email protected] > >>>>>>>> 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 <[email protected]> > 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 <[email protected]> > 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 <[email protected] > > > >>>>>> 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 < > >>>>>> [email protected]> > >>>>>>>>>>>>> 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 - [email protected] - 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" <[email protected]> > 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 > >>>>>>>>>>>>>>>>>>>> [email protected] > >>>>>>>>>>>>>>>>>>>> > http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>>> _______________________________________________ > >>>>>>>>>>>>>>>>>>> Bf-committers mailing list > >>>>>>>>>>>>>>>>>>> [email protected] > >>>>>>>>>>>>>>>>>>> > http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>>> _______________________________________________ > >>>>>>>>>>>>>>>>>> Bf-committers mailing list > >>>>>>>>>>>>>>>>>> [email protected] > >>>>>>>>>>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>>>>>>>>>>> _______________________________________________ > >>>>>>>>>>>>>>>>> Bf-committers mailing list > >>>>>>>>>>>>>>>>> [email protected] > >>>>>>>>>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> _______________________________________________ > >>>>>>>>>>>>>>>> Bf-committers mailing list > >>>>>>>>>>>>>>>> [email protected] > >>>>>>>>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> _______________________________________________ > >>>>>>>>>>>>>>> Bf-committers mailing list > >>>>>>>>>>>>>>> [email protected] > >>>>>>>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>> _______________________________________________ > >>>>>>>>>>>>>> Bf-committers mailing list > >>>>>>>>>>>>>> [email protected] > >>>>>>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>>>>>>>> > >>>>>>>>>>>>> _______________________________________________ > >>>>>>>>>>>>> Bf-committers mailing list > >>>>>>>>>>>>> [email protected] > >>>>>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>>>>>>> > >>>>>>>>>>>> _______________________________________________ > >>>>>>>>>>>> Bf-committers mailing list > >>>>>>>>>>>> [email protected] > >>>>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>>>>>> > >>>>>>>>>>> _______________________________________________ > >>>>>>>>>>> Bf-committers mailing list > >>>>>>>>>>> [email protected] > >>>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>>>>> > >>>>>>>>>> _______________________________________________ > >>>>>>>>>> Bf-committers mailing list > >>>>>>>>>> [email protected] > >>>>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>> _______________________________________________ > >>>>>>>> Bf-committers mailing list > >>>>>>>> [email protected] > >>>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>>> > >>>>>>> _______________________________________________ > >>>>>>> Bf-committers mailing list > >>>>>>> [email protected] > >>>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>>> > >>>>>> _______________________________________________ > >>>>>> Bf-committers mailing list > >>>>>> [email protected] > >>>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>>>> > >>>>> _______________________________________________ > >>>>> Bf-committers mailing list > >>>>> [email protected] > >>>>> http://lists.blender.org/mailman/listinfo/bf-committers > >>>> > >>> _______________________________________________ > >>> Bf-committers mailing list > >>> [email protected] > >>> http://lists.blender.org/mailman/listinfo/bf-committers > >>> > >> > >> _______________________________________________ > >> Bf-committers mailing list > >> [email protected] > >> http://lists.blender.org/mailman/listinfo/bf-committers > > > > > > > > -- > > - Campbell > > > > -- > - Campbell > _______________________________________________ > Bf-committers mailing list > [email protected] > http://lists.blender.org/mailman/listinfo/bf-committers > _______________________________________________ Bf-committers mailing list [email protected] http://lists.blender.org/mailman/listinfo/bf-committers
