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

[Julian Brooks]

"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
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20130525/67ebe1d9/attachment.htm>