algorithmic modeling for Rhino


Pachyderm Acoustic

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

Location: Earth
Members: 179
Latest Activity: Oct 24

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:
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

Discussion Forum

Particles colour in simulation 2 Replies

Hello everyone!I set the particles to downgrade from red at the beggining (a hot colour) to blue at the end (a cold colour), but when I run the simulation some of the first frames turns from red to a…Continue

Started by Catherine Granada. Last reply by Catherine Granada Oct 24.

Absorption designer 1 Reply

Hello everyone. I am trying to get the absorption coefficient of an element with the "Call absorption designer" in PachyDerm_Acoustic - Pachyderm Hybrid Models. When I set a Porous material + Solid…Continue

Started by Catherine Granada. Last reply by Arthur van der Harten Oct 12.

Installation issues 48 Replies

This is a place to ask qustions about installation. Please post your questions here and I will get to them as quickly as I can.Continue

Started by Arthur van der Harten. Last reply by Arthur van der Harten Apr 19.

Sound Simulation_ Reverberation Time calculation_Inconsistant Results

Good morning all,I am currently working on the calculation of the reverberation time of different closed spaces. I have a closed geometry (simplified model of the Hypogeum in Malta), and what I did…Continue

Started by Alejandro Estrella Apr 1.

Comment Wall


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Comment by Arthur van der Harten on November 15, 2022 at 7:19am
Hi kyujin,

For geometrical methods, no. That's what you get.

Other frequencies are possible with the numerical methods, though. Some of that functionally isn't released yet, but if you play with pach_numerictimedomain, you will see what I mean.

Comment by Kyujin on November 15, 2022 at 3:34am

Hi, I was wondering if there's a way to adjust the scope of the octave band frequency. It is set as a default 0=62.5Hz, 7=8000Hz. Does the component allow input of higher/lower frequency? Also, would it be possible to plot 1/3 octave band with this plugin? Thanks in advance!


Comment by Arthur van der Harten on November 7, 2022 at 5:06am
Hi TC,
It depends on what you wanted to achieve. If you are simulating a sound system, then you really need to get the three source objects into the same impulse response. Come to think of it, that would be easier to do in the rhino interface, so I suggest you do your simulation there.

However, if that isn't the case, I wouldn't average but treat them as three separate results.

Comment by TC.A on October 31, 2022 at 9:31pm

Hi, I'm trying to use pachyderm to study an existing space. How do I deal with sources when I have multiple points of sound source (ie multiple speakers within the room)? When I set multiple points in grasshopper, the node StatRec turns red. It does work when I tried graph the Pt node but I get separate results for each source point, should I flip the tree and average the results for each frequency? Thank you very much!

Comment by Kousai Tashani on October 31, 2022 at 4:29am

hello Arthur 
İ sent you an Email please check your email or spam box. 
thank you for your support :)  

Comment by Arthur van der Harten on October 27, 2022 at 9:38am
Hi Kousai,
That's something about your model. It might happen in an extremely hard room, or a space where rays are getting stuck.
Can you send it to me?
Comment by Kousai Tashani on October 27, 2022 at 9:19am

hello Arthur, 
its been ve exciting using the Pachyderm for a week now, 
first of all thank you for developing the plugin. 

I am facing a problem While using pachyderm through rhino. 
in the hybrid mode window and after setting up all the settings I normally click "Calculate solution" 
it takes action in the command line till i see " Preparing threads" and its stuck there. its not going anyfurther. 

is there anyone facing the same issue and having a solution for that? 

grasshopper is working fine so far i guess!! 

thank you all 

Comment by Arthur van der Harten on June 5, 2022 at 6:10pm
The selected color scale works with the 'preview' option. If you use the buttons at the bottom of the form, it uses actual geometry, which does use the current layer.

Variegation allows you to select a characteristic dimension for the surface scattering or roughness. This might be the depth of relief, or have something to do with the size of flat portions. That dimension is the quarter wavelength of above which scatterering is very high, and below which it is very low.

Convergence - minimum convergence takes portions of the impulse response and determines how much it has changed at intervals. When the degree of change is below a certain threshold for 10 consecutive checks, then the simulation can be said to have converged sufficiently.

Let me know if you have questions.

Comment by Daniel Horta on June 5, 2022 at 3:45pm

Furthermore, I would like some insights into how convergence works in Pachyderm. I'm familiarized with the concept of convergence from CFD simulations but it seems to work differently in Pachyderm. Besides that, what we can do to correct a model that doesn't seem to converge when put through "Detailed Convergence". Thank you!

Comment by Daniel Horta on June 5, 2022 at 3:32pm

Hi Arthur, hope everything is fine.

I was wondering if you could explain how we should use the "Variegation (characteristic dimension)" slider. I searched online but didn't manage to find anything about this specific term in articles about the use of scattering coefficients in simulations. Thanks in advance. Cheers!


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