Kenneth nous illumina en ce 2009-03-13 13:32 -->
> "clipka" <nomail@nomail> wrote:
> 
>> Not bad (well, the render time *is* :))
>>
>> But the real things have a slightly different mesh: Instead of one direction
>> converging at the poles, it is centered around a different axis. If you know
>> what I mean. So when seen from the top, it looks like a (more or less) perfect
>> square grid.
> 
> Yes, now that you mention it, I think you're right. I wonder how they form the
> wire mesh into a ball (or hemisphere, as the case may be, which is probably
> easier) without a visible 'pole' showing? If just a hemisphere, I guess you
> could simply press the pre-made mesh into a bowl-shaped form or mold, and
> accept the slight distortion (?)
> 
> KW
> 

The mesh is just pressed against a ball. The center is undistorded, there is 
also about no distortion going up-down and sideway. The diagonals are distorted.
Then, a metal ring is placed around and welded in place. The exess parts are 
then cut away. End result: an hemisphere. Two are fitted together, the back one 
having a hole cut into it to fit the body of the mycrophone.

-- 
Alain
-------------------------------------------------
   My wife's such a bad cook, the dog begs for Alka-Seltzer.
   	Rodney Dangerfield

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Kenneth wrote:
> "clipka" <nomail@nomail> wrote:
> 
>> Not bad (well, the render time *is* :))
>>
>> But the real things have a slightly different mesh: Instead of one direction
>> converging at the poles, it is centered around a different axis. If you know
>> what I mean. So when seen from the top, it looks like a (more or less) perfect
>> square grid.
> 
> Yes, now that you mention it, I think you're right. I wonder how they form the
> wire mesh into a ball (or hemisphere, as the case may be, which is probably
> easier) without a visible 'pole' showing? If just a hemisphere, I guess you
> could simply press the pre-made mesh into a bowl-shaped form or mold, and
> accept the slight distortion (?)
> 
> KW
> 
	For reference:
http://elderly.com/images/new_instruments/MIK/PG58_microphone.jpg

		Jerome
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mailto:jeb### [at] freefr
http://jeberger.free.fr
Jabber: jeb### [at] jabberfr
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49bb5237$1@news.povray.org...
>>
> For reference:
> http://elderly.com/images/new_instruments/MIK/PG58_microphone.jpg
>
> Jerome

THE  worldwide professionnal reference for voice microphone is Shure SM58
http://www.polymix-dj.com/catalog/images/SSH-SM58-LCE-B.jpg
Note that it does not come with any switch .
Switching a mike on/off is a too serious case to let it at user good will (a 
sound engineer POV :-)
No shiny finish either... a microphone must be sort of stealth.

Marc

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Alain <ele### [at] netscapenet> wrote:

>
> The mesh is just pressed against a ball. The center is undistorded, there is
> also about no distortion going up-down and sideway. The diagonals are distorted.
> Then, a metal ring is placed around and welded in place. The exess parts are
> then cut away. End result: an hemisphere. Two are fitted together, the back one
> having a hole cut into it to fit the body of the mycrophone.
>

That makes sense. I've never actually looked close-up at my own Shure
microphone, to see just how the mesh hemispheres are constructed, and what mesh
distortions they may have. Now I'm curious!

Ken W.

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"Kenneth" <kdw### [at] earthlinknet> wrote:
> Yes, now that you mention it, I think you're right. I wonder how they form the
> wire mesh into a ball (or hemisphere, as the case may be, which is probably
> easier) without a visible 'pole' showing? If just a hemisphere, I guess you
> could simply press the pre-made mesh into a bowl-shaped form or mold, and
> accept the slight distortion (?)

As a matter of fact, I don't recall having ever seen a microphone that has more
than a hemisphere - not without some "equator" kind of thing, that is.

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"m_a_r_c" <jac### [at] wanadoofr> wrote:
> Note that it does not come with any switch .
> Switching a mike on/off is a too serious case to let it at user good will (a
> sound engineer POV :-)

Yeah. Did a bit sound engineering in a church. Mike on/off switches are of the
devil...

Unfortunately we also had some wireless mikes that came with a mute switch on
the transmitter. Pastoral staff knew well enough to not mess with them (in fact
they insistend in not having to bother about it), but guests familiar with those
toys would occasionally mute them until they were heading for the pulpit... or,
occasionally, until we interrupted them to please turn the thing back on again
so we could give them some amplification ;)

Fortunately, those wireless mikes at least didn't give you that "Pop!" that
tells every sane person that PA systems do *not* like those switches to be
operated without prior warning to the sound engineer (which would in fact make
the switch perfectly redundant)...


> No shiny finish either... a microphone must be sort of stealth.

Hum... then why do they leave the mesh bare metal?

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clipka wrote:
> "Gaf" <nomail@nomail> wrote:
>> A simple isosurface microphone thing with radiosity and focal blur. Render time
>> 86 hour.
> 
> Not bad (well, the render time *is* :))
> 
> But the real things have a slightly different mesh: Instead of one direction
> converging at the poles, it is centered around a different axis. If you know
> what I mean. So when seen from the top, it looks like a (more or less) perfect
> square grid.
> 
> Why not use sphere sweeps? I fancy they'd be faster.
> 
> 

So, you got me interested.
Here's a test of a sphere_sweep version of a deformed mesh cap.
Render time: 1hr29min. (dual core, 3.7b31) Radiosity on, no focal blur.

cshake

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Attachments:
Download 'microphonecap.png' (262 KB)

Preview of image 'microphonecap.png'

CShake <cshake+pov### [at] gmailcom> wrote:
> Here's a test of a sphere_sweep version of a deformed mesh cap.

Looking good! Now all you need to do is get some "cushion deformation" into the
mesh (if you know what I mean; looking head-on, the wires should appear to
"bend outward" where they're closer to the mike's central axis), so that they
hit the "equator" at a shallower angle, and then you'll have the real thing.


> Render time: 1hr29min. (dual core, 3.7b31) Radiosity on, no focal blur.

Hum, let's see what focal blur makes of it...

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m_a_r_c wrote:

> 49bb5237$1@news.povray.org...
>> For reference:
>> http://elderly.com/images/new_instruments/MIK/PG58_microphone.jpg
>>
>> Jerome
> 
> THE  worldwide professionnal reference for voice microphone is Shure SM58
> http://www.polymix-dj.com/catalog/images/SSH-SM58-LCE-B.jpg
> Note that it does not come with any switch .
> Switching a mike on/off is a too serious case to let it at user good will (a 
> sound engineer POV :-)
> No shiny finish either... a microphone must be sort of stealth.
> 
	Being no sound engineer, I'll take your word for it. I only linked
the picture for the view it offers of the steel mesh.

		Jerome
- --
mailto:jeb### [at] freefr
http://jeberger.free.fr
Jabber: jeb### [at] jabberfr
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49bd220d@news.povray.org...
> Being no sound engineer, I'll take your word for it. I only linked
> the picture for the view it offers of the steel mesh.
>
It was just a personal point of view, anybody can use (and model) the 
microphone he wants :)


Marc

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