[PD] How to map moving points in 3D space (x, y, z) to quad panning?

Julian Brooks jbeezez at gmail.com
Sat May 25 11:55:55 CEST 2013


Aaah - late night existential ennui.

Time to start fresh and figure this out.


On 25 May 2013 03:08, Julian Brooks <jbeezez at gmail.com> wrote:

> "translate y into x as my pmpd masses are fixed on that axis"
>
> What I meant to say was translate 'z' into 'y' (as y is fixed).
>
> But is this correct, can anyone confirm I'm on the right path?
>
> The numbers that pmpd is spitting out on the z plane travel between -4 and
> 4 and I'm presuming that they should then be mappable as in effect the y
> plane for quad panning?
>
>
>
> It works in theory if continuing the grid theory of 4 speakers on, in
> effect x and y, (in my head at least), though I'm still struggling to get
> this going in any meaningful way.
>
>
> On 24 May 2013 22:56, Julian Brooks <jbeezez at gmail.com> wrote:
>
>> Hi IOhannes,
>>
>> I think I was attempting to wrap my head around starting from scratch
>> with this but actually I should see it through and carry on with Lorenzo's
>> external, try to figure out where I'm going wrong - I have made use of it a
>> few years ago and it worked well.
>>
>> I think part of it is that Lorenzo's example patch has used [grid] (which
>> actually makes lots of sense) but I don't have it on my install.  So
>> attempting to translate it into vanilla is a ssttretchh.
>>
>> Gonna bite the bullet and build a few libs and externals.
>>
>> I think as well that I was approaching this wrong.  Instead of thinking
>> in 3D I can just translate y into x as my pmpd masses are fixed on that
>> axis (don't know why I didn't think of it earlier tbh, but there you go).
>>
>> Regards,
>>
>> Julian
>>
>>
>> On 24 May 2013 18:50, IOhannes zmölnig <zmoelnig at iem.at> wrote:
>>
>>> On 05/24/2013 04:43 PM, Julian Brooks wrote:
>>>
>>>> Hi all,
>>>>
>>>> So yeah - that (the subject).
>>>>
>>>> I would like to map some 3D moving sources (from Pmpd) in quad.
>>>>
>>>> I had been hoping to make use of Lorenzo's [panner_1x4~], from here
>>>> https://gitorious.org/pd-**panner-4ch<https://gitorious.org/pd-panner-4ch>
>>>> but I just can't wrap my head around the maths involved.
>>>>
>>>> Anyone have any experience with this, or alternate strategies - the
>>>> leanest
>>>> possible please as it's on the RPi.
>>>>
>>>> Speakers are in a square/diamond and very close together - 25cm or so.
>>>>
>>>> It doesn't have to be very accurate and I would just like to have the
>>>> impression that the five pmpd generated sound sources are moving around
>>>> but
>>>> my attempts so far sound cack.
>>>>
>>>> Also presuming that as we're not doing ambisonic type malarkey that the
>>>> y-axis is pretty much redundant but, well, dunno?
>>>>
>>>> Had a dig around here and hurleur but nothing obvious jumped out at me.
>>>>
>>>> Tips, tricks, pointers or tutorials most gladly accepted
>>>>
>>>>
>>>
>>> i'm not sure what your problem is, but probaby zexy's [cart2sph] will
>>> help mapping the cartesian XYZ coordinates to spherical distance/direction
>>> coordinates. for panning you will usually use the direction coordinate(s)
>>> only.
>>>
>>> fgmasr
>>> IOhannes
>>>
>>>
>>
>
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