"Robert McGregor" <rob### [at] mcgregorfineartcom> wrote:
> "Kenneth" <kdw### [at] gmailcom> wrote:
> > For *years*, I've been trying to convince the venue's owners to put *some*
> > kind of sound-absorbing panels (or whatever) on the L-shaped walls that
> > surround us. But they don't seem to think it's important. *sigh* :-(
> > I haven't given up, though!
>
> I hear you, I've been through the exact same thing. A couple of years ago I
> finally convinced the owner at my local "super-reverberant" regular gig venue to
> let me make hang some of my absorber panels on the walls. It made such a big
> difference that he paid me to make and install  25 of them :)
>

Ha! Congratulations. The owner of that venue is obviously more pro-active, and
listens to reason.

Sound absorbing vs. sound scattering: I have to admit that I never thought about
the differences(!) Thanks for the brain-boost ;-)  My previous ideas about
modifying my local venue's L-shaped corner involved using lots of
randomly-oriented carpeted/padded panels, sticking out from the walls. (Based on
low cost.) But perhaps the panels should have hard surfaces(?) I obviously need
to do more research, ha. (Not that I have much chance of implementing the idea,
sad to say.)

Post a reply to this message

"Kenneth" <kdw### [at] gmailcom> wrote:

> Sound absorbing vs. sound scattering: I have to admit that I never thought about
> the differences(!) Thanks for the brain-boost ;-)  My previous ideas about
> modifying my local venue's L-shaped corner involved using lots of
> randomly-oriented carpeted/padded panels, sticking out from the walls. (Based on
> low cost.) But perhaps the panels should have hard surfaces(?) I obviously need
> to do more research, ha. (Not that I have much chance of implementing the idea,
> sad to say.)

Yes, there's a lot to learn about acoustics, it's a really complex topic.
General rule: absorption > diffusion

This is a site that I've referenced for years regarding the effectiveness of
various absorption materials (I prefer mineral wool over fiberglass):

http://www.bobgolds.com/AbsorptionCoefficients.htm


Here's a great short video (from a studio legend) on making some absorber
panels, very similar to the methods I use:

https://www.youtube.com/watch?v=EdFQ4LOpCMk


I don't know where you're located but here's a link to a Florida company that
sells all kinds of materials, from bundles of mineral wool panels and fabric to
fully built professional panels of all kinds:

https://www.acoustimac.com/


These are the raw mineral wool panels that I use:

https://www.acoustimac.com/acoustic-insulation-materials/acoustic-insulation/mineral-wool-acoustic-insulation/roxul-rb8
-2in


You can also order an equivalent product from Grainger if you have one of those
near you, but the price is about the same as having Acoustimac ship it to me
here in North Carolina (and I don't have to drive and pick it up).

Hope this helps!

Cheers,
Rob

Post a reply to this message

Robert McGregor wrote on 31/12/2020 22:30:
> Hi all,
> 
> I've been building some new acoustic treatments for my recording studio and
> worked out a design for a 2D Quadratic Residue Diffuser (QRD) based on the prime
> number 19, but had no idea what it would actually look like. So, I fired up
> POV-Ray (a year-long hiatus) and after creating a simple 2d array of wood
> lengths I was able to get this pretty decent visualization in no time.
> 
> The physical unit will be 2 x 4 feet and the math says it should diffuse
> soundwaves from ~430Hz to ~5400 Hz, which is just what I need for the rear wall
> of my control room. Now I just need to actually go out to the workshop to cut
> and glue 700+ pieces of wood. Luckily the snow has been very light so far this
> season.
> 
> Cheers,
> Rob
> 

A beautiful image!
Paolo

Post a reply to this message

"Robert McGregor" <rob### [at] mcgregorfineartcom> wrote:
> Hi all,
>
> I've been building some new acoustic treatments for my recording studio and
> worked out a design for a 2D Quadratic Residue Diffuser (QRD) based on the prime
> number 19, but had no idea what it would actually look like. So, I fired up
> POV-Ray (a year-long hiatus) and after creating a simple 2d array of wood
> lengths I was able to get this pretty decent visualization in no time.
>
> The physical unit will be 2 x 4 feet and the math says it should diffuse
> soundwaves from ~430Hz to ~5400 Hz, which is just what I need for the rear wall
> of my control room. Now I just need to actually go out to the workshop to cut
> and glue 700+ pieces of wood. Luckily the snow has been very light so far this
> season.
>
> Cheers,
> Rob

Robert
Have you tried gluing blocks like this together.  If not perhaps a read of this
thread may prove helpful

https://www.ukworkshop.co.uk/threads/warping.127595/#post-1424579

AQ

Post a reply to this message

Am 31.12.2020 um 22:30 schrieb Robert McGregor:
> Hi all,
> 
> I've been building some new acoustic treatments for my recording studio and
> worked out a design for a 2D Quadratic Residue Diffuser (QRD) based on the prime
> number 19, but had no idea what it would actually look like. So, I fired up
> POV-Ray (a year-long hiatus) and after creating a simple 2d array of wood
> lengths I was able to get this pretty decent visualization in no time.
> 
> The physical unit will be 2 x 4 feet and the math says it should diffuse
> soundwaves from ~430Hz to ~5400 Hz, which is just what I need for the rear wall
> of my control room. Now I just need to actually go out to the workshop to cut
> and glue 700+ pieces of wood. Luckily the snow has been very light so far this
> season.
> 
> Cheers,
> Rob
> 
Very nice indeed!

 From colors and mood it reminds a little bit your old catenoid-scene 
(IRTC August 2005). As ever your textures are superb. Can you imagine to 
share your code?

Best regards
Michael

Post a reply to this message

Paolo Gibellini <p.g### [at] gmailcom> wrote:
> A beautiful image!

Thank you Paolo :)

Post a reply to this message

"Anthraqunione" <nomail@nomail> wrote:

> Robert
> Have you tried gluing blocks like this together.  If not perhaps a read of this
> thread may prove helpful
>
> https://www.ukworkshop.co.uk/threads/warping.127595/#post-1424579
>

No, I have never tried gluing up anything this complex. Thanks for the link, I
will read through all those posts.

Post a reply to this message

MichaelJF <mi-### [at] t-onlinede> wrote:

> Very nice indeed!
>
>  From colors and mood it reminds a little bit your old catenoid-scene
> (IRTC August 2005). As ever your textures are superb. Can you imagine to
> share your code?

Thank you Michael, I would never have made a connection with that old image,
but I guess I must have a certain innate "style" :)

I just uploaded the scene file to p.t.s-f:

http://news.povray.org/povray.text.scene-files/thread/%3Cweb.6002126d63494fcb87570eab0%40news.povray.org%3E/


Cheers,
Rob

Post a reply to this message

"Robert McGregor" <rob### [at] mcgregorfineartcom> wrote:
> "Mr" <nomail@nomail> wrote:
> > Both look great ! Would you mind it if I Shared the pictures on Facebook with
> > proper credit and your small explanation of what they are?
>
> Thanks "Mr" - sure, go ahead and share.
>
> > If so I would ask you: Did you use front end 3D editor(s) or not at all?
> > depending on it I would share on one group or the other.
>
> I did not use any 3D modelers for these images, I think that's what you're
> asking? I used only POV-Ray SDL via Chris Cason's awesome POV-Ray for Windows
> integrated text editor/renderer.
>
> > I like to advertise elsewhere as I noticed many people
> > don't come here and still enjoy  getting to see what is actually achieved with
> > POV.
>
> Please feel free to share my website that is filled with my POV-Ray imagery as
> well: www.mcgregorfineart.com
>
> Cheers,
> Rob

Thanks, done here https://www.facebook.com/groups/739767156410999  (sorry for
those without a FB account if it's not visible).

Post a reply to this message

Am 15.01.2021 um 23:20 schrieb Robert McGregor:
> MichaelJF <mi-### [at] t-onlinede> wrote:
> 
>> Very nice indeed!
>>
>>   From colors and mood it reminds a little bit your old catenoid-scene
>> (IRTC August 2005). As ever your textures are superb. Can you imagine to
>> share your code?
> 
> Thank you Michael, I would never have made a connection with that old image,
> but I guess I must have a certain innate "style" :)
> 
> I just uploaded the scene file to p.t.s-f:
> 
>
http://news.povray.org/povray.text.scene-files/thread/%3Cweb.6002126d63494fcb87570eab0%40news.povray.org%3E/
> 
> 
> Cheers,
> Rob
> 
> 
> 
> 
Many, many thanks,

I was most surprised by your ligthing and will think a little bit about 
your use of environment light. I never used it this way. Usually one has 
highly reflective objects like Ash's teapot some weeks ago here. In your 
case this light brightens the scene a bit while loosing contrast on the 
other hand. But it has a very nice additional effect to blur the 
shadows. May be this approach works better in POV than an area light.

Best regards
Michael

Post a reply to this message