Pachyderm Acoustic

Information

Pachyderm is a plugin largely used by Designers and Scientists alike to simulate acoustics in buildings, rooms, cities, and other settings.

Website: http://www.orase.org
Location: Earth
Members: 192
Latest Activity: yesterday

Hello Pachyderm Users,

We are going through an exciting period, including the startup of an organization to support the growth of Pachyderm, and extend the educational agenda of the project. In the next few weeks, we will be submitting our long-form 501(c)3 application, which will give us the rights of a not-for-profit organization established in the state of Connecticut. As part of the transition, we are phasing out the old website. The new site will be up in the next few weeks, and you can find it at:

www.orase.org

We are looking forward to the next phase of this project, and we hope that you will be there with us to learn and continue to support us!

kind regards,

Arthur van der Harten

Executive Director

Open Research in Acoustical Science and Education

ORASE

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Comment by Van-Tung Nguyen on July 9, 2025 at 10:25am: I simulated a classroom with identical geometry and material settings, but the simulation results are not accurate and deviate significantly. I would appreciate any help or suggestions to improve this.

Simulation file:

RT simulation (.gh file)

setting & experiment

https://www.sciencedirect.com/science/article/pii/S0003682X21001596

Comment by Aiym on May 5, 2025 at 9:30am: Hello Arthur! Is there a Way to use the tool for Urban design? Using different sources and receivers for Block massing design through noise level optimisation or anything in the urban scale? Can you recommend a tool or process for approaching urban massing through noise input in general?

Comment by Arthur van der Harten on September 21, 2023 at 5:31am: Hi Catherine,

You change it in the usual way. It's just a list of 8 numbers. The default is 120 dB at each of the 8 octave bands, 63 Hz. through 8kHz.

You can either right-click it and mouse down to 'Set Multiple Numbers'. You can also use a number module, and set 8 numbers in it, and then connect it to the 'P' input.

Hope this helps.

Arthur

Comment by Catherine Granada on September 20, 2023 at 3:19pm: Hello Arthur,

I would like to know please how can I change the sound power of my source in Grasshopper, wich is set in 120dB if I am not wrong. Or, is it possible to change that parameter?

Thank you in advance!

Catherine

Comment by Encarni Encinas on April 19, 2023 at 1:30am: Hi All,

I have been trying to add the Pachyderm Acoustics plugin for both Rhino 6 SR10 and Rhino 7 SR19. For both programs I get the loading error when trying to add the plugin, and I don't know why or what I can do to fix it.

If anyone has any hints on how to fix it, it would be of great help to me.
Thanks in advance :)

Encarni

Comment by Arthur van der Harten on March 24, 2023 at 12:41pm: Hi Catherine,
You set materials in the materials tab via absorption and scattering coefficient... Although it isn't the right tool to predict sound isolation.
Arthur

Comment by Catherine Granada on March 24, 2023 at 12:30pm: Hi Arthur,

How can I set the different materials that i'm working with in my simmulation? For example, I want to separate a space with dividing panels wich have different geometries and materials (wood, glass, metal, plastic) and want to see how the sound behaves in each case. Is it possible to do that?

Thank you in advance.

Comment by Daniel Horta on December 7, 2022 at 12:16pm: Hi Arthur, it's me again... sorry haha!

I was having a problem that every time I would try to convolve some IR given by a simulation I would notice a very distinct separation almost like a pre-delay that I thought didn't make sense for the space I've simulated.

So I checked the IR .wav file and found this:

This big gap at the beginning is normal? Why so? When I convolve the IR without this gap the auralization sounds much more credible.

Thank you!

Comment by Kyujin on December 5, 2022 at 5:20am: Hi Arthur,

After running the simulation, I'm trying to analyze what the results imply. Is there a way where you can get the data of rays that were taken into account for calculation? The simulation was done with trace specified number of rays. If it's possible in Rhino instead of grasshopper, it would still be a great help to know. Thanks:)

Kyujin

Comment by Daniel Horta on December 1, 2022 at 8:24pm: Thank you very much for the super fast reply, Arthur!!

I really appreciate not just the incredible software that you offer completely for free but also your dedication to the education surrounding it and acoustics in general.

Coming from an education in Architecture at a school that doesn't offer extensive education in acoustics people like you make the process of understanding these complicated concepts way easier and enjoyable

Cheers,

Daniel