Pd-list March 2005

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166 participants
274 discussions

multiple_window feature of Gem?
by Mike Wozniewski 21 Mar '05

21 Mar '05

Hi. I've found some mention to the "multiple_window" of Gem. How do I get started with this? Are there any docs that describe how to get Gem working in multiple windows? Also, we're trying to run Gem in an immersive environment, with several projectors maintained by different machines. Originally, we were going to have multiple copies of the same Pd/Gem environment running on each machine, with some synchronization controls being sent through the network. But I'm excited about using the multiple_window feature to perhaps have only one machine running the environment, and just sending the other Gem windows to the other machines. Can someone explain how I would go about doing this? At some point, IOhannes said: "it is kind of X-forwarding; my guess was, that since X is forwarding only the openGL-instructions (instead of the window "pixel" contents) this should be fast enough (except when big textures are involved, where we are at the stage of normal pixel-forwarding)" How do I send the multiple Gem windows to various other machines in this lite fashion so that only openGL instructions are sent, and not the full contents? Also, if James Tittle is out there: Did you ever finish your example patch that shows how to do "frustum culled" rendering with multiple windows in Gem? It is quite essential that we be able to display different views of our 3D environment on each of the screens, and that the viewing frustums line up according to screen geometry. Any examples that you have of this would be greatly appreciated. Thanks a ton, Mike Wozniewski

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Re: Writing Csound scores with PD (Spencer Russell)
by Kjetil Svalastog Matheussen 21 Mar '05

21 Mar '05

Spencer Russell: > > Hey Listers, > I'm still pretty new to PD, but it's probably the synthesis > environment that I feel most comfortable in. I've got to write a > piece using Csound, however, for my electronic composition class, > which has to include at least 100 lines in the score file. Now, > being as I already have some random rhythm/note generation > patches created in PD, I thought it'd be great to get them to > write a csound score file for me (algorithmic composition has a > thumbs up from my prof). :) > > does anyone know how I can do this? I know how to use [pack] to > create the messages that would represent lines in the score, but > I basically need an object that recieves messages, and appends > them to a text file, with each messages on its own line. > The k_guile external: http://www.notam02.no/arkiv/src/pd/ ...works fine with common music: http://ccrma.stanford.edu/software/cm/doc/cm.html ...which can output csound scores. You need to know lisp/scheme though. --

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Writing Csound scores with PD
by Spencer Russell 21 Mar '05

21 Mar '05

Hey Listers, I'm still pretty new to PD, but it's probably the synthesis environment that I feel most comfortable in. I've got to write a piece using Csound, however, for my electronic composition class, which has to include at least 100 lines in the score file. Now, being as I already have some random rhythm/note generation patches created in PD, I thought it'd be great to get them to write a csound score file for me (algorithmic composition has a thumbs up from my prof). :) does anyone know how I can do this? I know how to use [pack] to create the messages that would represent lines in the score, but I basically need an object that recieves messages, and appends them to a text file, with each messages on its own line. thanks, spencer

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Fwd: [PD] GEM pix delay loop
by vade 21 Mar '05

21 Mar '05

ugh. someone needs to set the reply-to address in the mailing list robot to default to the PD list... :\ Begin forwarded message: > From: vade <doktorp(a)mac.com> > Date: March 21, 2005 11:25:57 AM EST > To: "B. Bogart" <ben(a)ekran.org> > Subject: Re: [PD] GEM pix delay loop > > Would using pix_separate to separate the pix_data in the chain right > above your [s loop] generate a 'new gemhead' type instance?? (havent > tried it) > > On Mar 21, 2005, at 10:34 AM, B. Bogart wrote: > >> This looks a lot more like a problem for a PDP solution. >> >> I would not think one could send the whole gemlist [s loop] back up >> the >> chain into itself. Remeber that in Gem it is NOT the video data >> passing >> through the gemchain but control data and pointers. >> >> Perhaps some Gem developers may have an idea of how to make this >> work... >> Gem is not the solution to all problems, and if you are working with >> the >> video-data passing through cords mind-set PDP/PiDiP is a better >> choice. >> >> I know Jamie is working on some PDP to Gem bridge stuff, maybe when >> that >> is ready you could combine the two and use PDP only for the pix_ >> stuff. >> >> Also in gridflow the data is actually passing through cords... but I'm >> not sure what OS your running or if Gridflow is the best solution to >> your particular problem. >> >> B. >> >> Ian Smith-Heisters wrote: >>> Hi. >>> >>> I'm trying to create a pix delay loop in GEM, but it doesn't work as >>> expected. >>> >>> [pix_video] >>> | >>> | [r loop] >>> | | >>> [pix_add] >>> | >>> [pix_delay 100] >>> |\ >>> | [pix_gain] >>> | | >>> | [s loop] >>> | >>> [gemlist...] >>> >>> It doesn't seem to do anything at all. I noticed that the [pix_add] >>> help >>> file has pix_ sources with their own gemheads. I tried throwing in >>> [pix_separator]s all over the place, and that didn't help. Any tips >>> or >>> suggestions? I find the whole GEM dataflow a bit odd since it's all >>> pointers (right?), and I'm used to PDP. Is there another way I can go >>> about the same thing? >>> >>> Thanks! >>> -Ian >>> >>> _______________________________________________ >>> PD-list(a)iem.at mailing list >>> UNSUBSCRIBE and account-management -> >>> http://iem.at/cgi-bin/mailman/listinfo/pd-list >>> >

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Re: [PD] feedback control
by matthew jones 21 Mar '05

21 Mar '05

> if so multiply that bands which an adjustable value <1 but wouldn't that have weird effects when the signal you are attempting to remove the feedback from is the sound of you whistling?? Or is this method the one that many feedback supressors use? I thought it was something like mimicking the effect of constantly moving the mic around so that the frequencies at which the system is unstable actually move around, done via slow variable delays or something like that. Thats just a guess though. You could use an adaptive line enhancer, if it was feasible to regularly calculate the inverse of a relatively large matrix and apply long FIR filters... tho on a laptop this is maybe a bit too hopeful. The true way would be to keep the mic fixed in place and measure the response from loudspeakers to the mic, then calculate the optimal response to cancel the signal as it arrives at the microphone with a second source (maybe the right side of a stereo pair) and use an adaptive filter..... but as Thomas says it would require near zero latency and heck, a lot of cpu power! Any ideas/improvements anybody? Matt -=-=-=-=-=-=-=-=-=-=-=- http://www.loopit.org -=-=-=-=-=-=-=-=-=-=-=- ----- Original Message ----- From: "sven" <ml.sven(a)subscience.de> To: <robertgarvin(a)bellsouth.net>; <pd-list(a)iem.at> Sent: Sunday, March 20, 2005 8:45 PM Subject: Re: [PD] feedback control > hi robert, > feedback suppression should be quite easy to achive w/ the vasp external. > fft the incoming signal. check if there are 1 or 2 bands which are much > louder than their neighbours. > if so multiply that bands which an adjustable value <1 and than take the > ifft. > feedback noise is a pure sine (until it's getting so loud that it' > distorts) so > they don't have overtones and cause a significant peak in at most 2 > neighbouring bands. > > sven. > > > _______________________________________________ > PD-list(a)iem.at mailing list > UNSUBSCRIBE and account-management -> > http://iem.at/cgi-bin/mailman/listinfo/pd-list

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Re: [PD] feedback control
by sven 21 Mar '05

21 Mar '05

hi robert, feedback suppression should be quite easy to achive w/ the vasp external. fft the incoming signal. check if there are 1 or 2 bands which are much louder than their neighbours. if so multiply that bands which an adjustable value <1 and than take the ifft. feedback noise is a pure sine (until it's getting so loud that it' distorts) so they don't have overtones and cause a significant peak in at most 2 neighbouring bands. sven.

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pix_write
by wollscheid 21 Mar '05

21 Mar '05

Hi list...! gem questions... when I save a picture with pix_write 2 things happen - automatically 5 zeros are added to file-name. How do I get rid of those? - when opening the picture with another program (like photoshop) it appears inverted and upside down... How can I change this with in GEM? Cheers Achim

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PDP CVS?
by vze26m98 21 Mar '05

21 Mar '05

Anyone know about the status of the CVS server at zwizwa.fartit.com? Tried to get pdp, etc., but stopped by 'cvs login' which wants something from me, I know not what... Best, Tad <vze26m98(a)optonline.net>

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help w/ downloaded externs..
by robertgarvin＠bellsouth.net 21 Mar '05

21 Mar '05

I downloaded the wahwah~ and disto~ externs from http://ydegoyon.free.fr/software.html they sound like they'd be really good if it weren't for the hissy noise in the patch... can someone take a look at the patches and see if there's a way to remove the hiss? Thanks, Robert

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Re: [PD] (yet another) data structures tutorial
by ggkarman＠musicologia.com 21 Mar '05

21 Mar '05

>One thing: You did not supply any file suffixes to both files on >puredata.org, their filenames are "Data" and "Tut" instead of >"Data.pdf" and "Tut.zip". If you find the time, I guess especially >Windows users would love if you could add the missing file endings. >Ciao >-- > Frank Barknecht Ah, ok. I hope it's fixed now Thanks for the fbk. greg.

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Pd-list March 2005