yes, and i am very thankful because i use pmpd every day (OsX) to generate beautiful control shapes (i.e. natural gesture simulation) jm
> Le 7 août 2017 à 13:56, cyrille henry <[email protected]> a écrit : > > hello, > > I had a look at a modalys-help.pd file. It appear that modalys is not > implemented as a pd abstraction, but as a compiled object. I may be wrong, > but I think this object use modalys file that define all material / shape / > exitator / etc. So it's quite useless without the full modalys software. > > anyway, in order to add my piece of answer to the original question: > about 20 years ago I made my master degree about a bow / string interaction > using a fake motorized bow and a virtual string. > 2 different strings where implemented : > > -The 1st sting was made using virtual 1D mass, spring and damper in a linear > arrangement, just like a spacial discretisation of a real string. This result > of incorrect tuning of high harmonics of the virtual string (regarding a real > string) > > -The 2nd string was made using something also named "modal synthesis" (but > very different from modalys) : it was "just" mass/spring/damper 1D resonator > connected together, a bit like the paper initially send in this thread. > > Since modalys use matrices, I guess that it use more complex interaction > between elements than a simple spring/damper interaction like I use to do. > This result in being able to also simulate the shape of the vibrating > structure. > > Anyway, about 15 years ago I start the pmpd library (physical modelling for > pure data) that provide simple mass / spring / damper simulation. The pmpd~ > object allow this kind of simulation at audio rate. There is an example of > the 1st kind of string simulation. The 2nd string can also be implemented > thanks to this object, but I did not provide any example since I miss the way > to tune the model. > > pmpd~ provide only simple interaction, so I don't use it any-more. I use the > pmpd object that is lot's more complex (but works only at data rate) and a > simple hack to compute audio data. There is also an example in the library > distribution. > > if you are interested, you can try pmpd using apt-get or deken on linux. I > know that Nicolas Montgermont compile pmpd for osX, so a recent binary exist > somewhere. I have no idea about recent build for windows. > > cheers > C > > > > Le 06/08/2017 à 21:58, Jean-Marie Adrien a écrit : >> would be great if it would be in pd abstractions ! >> everything is in the paper though, you are right, and the method is >> incredibly powerful, so the project was in that time to control it with >> gestures data bases and artificial intelligence and so on, all of this being >> existing now, not speaking about multi channel sound diffusion etc. >> I was disappointed when, after having developed the method at IRCAM, i >> discovered (and had to pay for it though) some ten years ago the actual >> modalys thing that was kind of retro engineered after i left IRCAM, from the >> big C++ initial software with was developed between 1984 and 89. >> The math is not so complex, it is just a matrix equation incremented step by >> step, and very straightforward and intuitive discontinuities in time domain >> which correspond to straightforward updates of the matrix, resulting for >> instance from contact between objects and other intuitive events. >> If you simplify the maths, it will probably become more complex i’d say, and >> you will probably hear it, because time domain sound synthesis is quite >> sensitive. >> On the same line, one advantage of modal synthesis is that you can achieve >> impossible physical excitations on imaginary structures, and interpolate >> between all this, having transient sounds and articulations, but even with >> the full math though, you could hear in that case that you were sort of >> tearing the equations, which corresponds to the fact that there is no >> existing physical gesture which you could refer to when exploring impossible >> configurations. >> Math simplification is what happened probably when the available pd modalys >> software was achieved : i was disappointed by this tool and rarely use it. >> Another application has been developed by Apple in Logic with the "sculpture >> » plugin : it is very much main stream, they probably make money with it and >> Im still poor. Bref. >> I’d love the true vintage thing on pd now : it is just implementing a matrix >> equation with updates conditions. >> The point is that, thirty years later, i do not understand anymore a single >> line in C++, although I’ve written many thousands of lines. >> Hmm. I dont believe it myself, how is this even possible ? But i remember >> very well the principles. Id be happy to help if i can anyway. >> jm >>> Le 6 août 2017 à 16:50, Jesse Mejia <[email protected]> a écrit : >>> >>> Yes - I mentioned Ircam's Modalys and that paper in my initial post. >>> Because modal synthesis is so well known, and well documented, I'm >>> surprised there isn't a similar (but free!) pd implementation. Something >>> with abstractions instead of externals would be great. >>> >>> So let's make one. I know it's a bank of resonant bandpasses, but working >>> out their relationships based on the modal characteristics of physical >>> shapes seems to be key, and abstracting those relationships to friendly >>> controls. >>> >>> The math in the papers is a bit beyond me but it looks like it's all there. >>> I can't tell by looking at it if it's something that would be too >>> hard/annoying to do with vanilla.. or if it's describable in a less math >>> heavy way. >>> >>> Alex - newly compiled versions of the stk would be great! I tried and >>> failed at that about a year ago. But the faust implementations compile well >>> from faust to pd. >>> >>>> On Aug 6, 2017, at 3:24 AM, cyrille henry <[email protected]> wrote: >>>> >>>> >>>> >>>>> :) >>>>> indeed and i had myself to _pay_ for it, which is something that probably >>>>> illustrates the "élégance à la française" >>>>> jm >>>> >>>> I did not encourage piracy, but since pd patch can't be protected I guess >>>> that an anonymous source could leak the files without any trouble. >>>> >>>> cheers >>>> c >>>> >>>> _______________________________________________ >>>> [email protected] mailing list >>>> UNSUBSCRIBE and account-management -> >>>> https://lists.puredata.info/listinfo/pd-list >>> >>> >>> _______________________________________________ >>> [email protected] mailing list >>> UNSUBSCRIBE and account-management -> >>> https://lists.puredata.info/listinfo/pd-list _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list
