[PD] PMPD on RPi
Julian Brooks
jbeezez at gmail.com
Mon Mar 11 16:58:45 CET 2013
Hi again,
"use link rigidity (K) in order to make the 2 masses to bounce one on the
other."
I was under the impression that you had to use interactors so that the
masses would bounce off each other (obviously not!)
How would I do that with links (K), is it in an example patch?
Main problem atm is that I like the sound of the patch on my laptop, even
with the technical mistakes, and it just doesn't sound so good on the Pi:(
I did have GEM for visualisation but that all got ripped out a while ago
knowing I would be hopefully porting to the Pi so it's now very hard to
know what's happening - back to the drawing board.
Jb
On 11 March 2013 14:48, Cyrille Henry <ch at chnry.net> wrote:
>
>
> Le 11/03/2013 14:48, Julian Brooks a écrit :
>
> Still getting occasional explosions with D & D2 at 32 & 8 respectively. K
>> for both links is now 15.
>>
>> If anyone has further suggestions please let me know.
>>
> i did find some strange things in your patch.
> there is a iCircle while most masses use iSphere, i think they should all
> use the same interactor in order to have a symetrical interaction.
>
> also, interactor create force, i would better use link rigidity (K) in
> order to make the 2 masses to bounce one on the other.
>
>
>
>
>> I'm really very curious, Cyrille, what you mean by 'accuracy can be the
>> answer'?
>>
> well, i wanted to point ou that the accuracy of the math is important.
>
> if you do abstraction that mimic mass/link, you can do physical model
> without pmpd. But it has been proven that it's not as accurate as
> externals. And this accuracy can create instabilities in some situation
> (specially when the system is close to an instable point).
>
> i have no idea why math should be less accurate on the Rpi, but that could
> be the answer on why your patch was working on a laptop, and not on the Pi.
>
> cheers
> c
>
>
>> I'm very aware that I've made all the settings 'by ear' so to speak, so
>> I'm not follwing any formulas here.
>>
>> Cheers,
>>
>> Julian
>>
>> On 11 March 2013 12:47, Julian Brooks <jbeezez at gmail.com <mailto:
>> jbeezez at gmail.com>> wrote:
>>
>> Hey Cyrille,
>>
>> Many thanks for testing.
>>
>> Good to know pmpd is working on the pi.
>>
>> Thanks for the spot about the link being set too high (D2), I have
>> set it to 15 as per your recommendation.
>>
>> I'm now experimenting with D and D2 to try and get a similar
>> soundworld as per my original patch. Still getting occasional
>> blow-ups/distortion for no apparent reason but at least something is
>> happening, which is so much better than what I had before.
>>
>> Interestingly it makes absolutely no difference to the resultant
>> sound whether Pd on the Pi is running via vnc and in gui mode or straight
>> from command line with -nogui.
>>
>> Progress though. Hurrah.
>>
>> Will report back with further progress.
>> (if anyone has an inclination to check the patch and offer
>> advice/assistance/**recommendations I would be hugely grateful)
>>
>> Very best wishes,
>>
>> Julian
>>
>>
>>
>>
>> On 11 March 2013 11:23, Cyrille Henry <ch at chnry.net <mailto:
>> ch at chnry.net>> wrote:
>>
>> hello,
>>
>> so, i've test your patch on my laptop : it work.
>> i compile pmpd on the rpi, test your patch and it don't run.
>> so i can confirm the problem, sending you pmpd binary will not
>> help
>>
>> basic pmpd example works on the Rpi. it's hard to fully test
>> because most examples need Gem.
>>
>> On the Rpi, the pmpd part of your patch did became unstable. i
>> can see the same behaviors on my laptop if I increase D2 a bit to much.
>> So, your patch is quite sensitive, and easily became unstable.
>> It look like the pi math is not accurate enough to keep your
>> patch stable.
>> when removing few masses, and playing with parameters, i was able
>> to get back to a stable situation.
>>
>> in fact, changing in btch_link_2 rigidity of the link from 125 to
>> 15 is enough to get the patch stable again. (after waiting for few second).
>> btw, i did not understand how a link with 125 rigidity connect to
>> mass weight 100 can not be instable.
>>
>>
>> So although pmpd did not work the same way on my laptop and on
>> the Rpi, i was not able to spot a problem on the Rpi.
>>
>> Accuracy can be the answer.
>> I'll be glad to here from peoples that know more than me on this
>> topic.
>>
>> cheers
>> c
>>
>>
>>
>>
>>
>> Le 11/03/2013 10:31, Julian Brooks a écrit :
>>
>> Bugger- sorry.
>>
>> Attached now
>>
>> BTW - Please be very careful with the audio level if testing
>> on RPi. It's very loud!
>>
>> Julian
>>
>> On 11 March 2013 09:23, Cyrille Henry <ch at chnry.net <mailto:
>> ch at chnry.net> <mailto:ch at chnry.net <mailto:ch at chnry.net>>> wrote:
>>
>> the vanilla-urn is missing.
>>
>> Le 11/03/2013 10:18, Julian Brooks a écrit :
>>
>> Hi Cyrille,
>>
>> Many thanks for assistance...
>>
>> The simplest solution I think is for me to send you
>> the whole patch.
>>
>> A simple example of my problem:
>>
>> Main patch is:
>> '1.BitChime_pd-list.pd'
>>
>> On my laptop the output going to [s mass1] from
>> within [btch_mass01_sph 0 1 0] in [pd mass_n_link] is between 0-1.
>>
>> On the RPi the same output is between 1-10000.
>>
>> Obviously this has some severe effects on the volume
>> as the pmpd collisions are driving the audio.
>>
>> Apart from pmpd the patch is vanilla.
>>
>> If anyone else can confirm the same behaviour it
>> would be appreciated.
>>
>> (Hey Antoine, just spotted your post, thanks for
>> weighing in)
>>
>> Best wishes,
>>
>> Julian
>>
>>
>>
>>
>>
>> On 10 March 2013 19:22, Cyrille Henry <ch at chnry.net<mailto:
>> ch at chnry.net> <mailto:ch at chnry.net <mailto:ch at chnry.net>> <mailto:
>> ch at chnry.net <mailto:ch at chnry.net> <mailto:ch at chnry.net <mailto:
>> ch at chnry.net>>>> wrote:
>>
>>
>>
>> Le 10/03/2013 20:12, Julian Brooks a écrit :
>>
>> Hi all,
>>
>> Does anyone have a copy of the most recent
>> PMPD compiled for the RPi that they can forward to me please?
>>
>> I'm having a few issues with a patch that
>> works fine on my laptop but is badly borked on the RPi and I think I've
>> narrowed it down to the PMPD lib that I've compiled.
>>
>> The version I've compiled seems to have
>> built but it's not working correctly.
>>
>>
>> i dit not compile pmpd but i could if needed.
>> But i don't think that i will make any diference.
>> could you explain the problem that i can test
>> here?
>>
>> cheers
>> c
>>
>>
>>
>>
>>
>> The patch runs at about 50% on the RPi (10% on
>> my laptop) so I'm hoping that should be ok.
>>
>>
>> Will report back after further testing.
>>
>> Many thanks in advance,
>>
>> Julian
>>
>>
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