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: 171
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:
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

Very cool, but Error "Index was outside the bounds of the array." 4 Replies

Hi, I am intrigued by Pachyderm. Thanks for creating and sharing it. Oddly, I am experimenting with not a room but a portable semi-transmission-line speaker enclosure. I want to see what's going on…Continue

Started by Brenda EM. Last reply by Arthur van der Harten Dec 1.

Chrash for getting the simulation mapping method 4 Replies

Hello to every one.I am getting a simulation of a residential complex in pachyderm. I need to say that I have tried a lot to model the project clear. because due to I was working with rhino 6 till…Continue

Tags: crash, software, and, system

Started by Alireza Mohammadi. Last reply by Alireza Mohammadi Nov 3.

Real Time Auralization 3 Replies

Dear all, for those of you interested in real time auralization, I recently made this GH file to use the outputs from the Pachyderm image source tracer to send auralization data to Max-MSP and Spat-5…Continue

Started by Alban Bassuet. Last reply by Arthur van der Harten Oct 28.

issue Could not load file or assembly 1 Reply

Hi, I'm facing this issue:1. Solution exception:Could not load file or assembly 'Pachyderm_Acoustic, Version=, Culture=neutral, PublicKeyToken=null' or one of its dependencies.I've installed…Continue

Started by Gabriele Stancato. Last reply by Arthur van der Harten Oct 15.

Comment Wall


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Comment by Antonio Treglia on January 16, 2017 at 3:16am

Sometimes it works, even if it's very ustable, but when I go to "Analysis" tab I receive this message: "Index is outside the matrix" and I can't see anything. Then, when I select a parameter (for example T-30, the software continues to crash). 

Comment by Antonio Treglia on January 16, 2017 at 2:50am


I followed the instructions on the site, I assigned the material (using one of the default materials) and I use 200000 rays for the simulation, but when I launched it, Rhinoceros crashed.

I tried to change the number of rays, the materials and other parameters, but the result is the same, the software crashes every time. What do you think is the problem?

Comment by Arthur van der Harten on January 12, 2017 at 6:23pm

Hi Antonio,

You do not need a closed box around the structure, though you will probably need a very high number of rays to get a good result from the model.

It might make sense for you to use the Rhinoceros interrface before you use the Grasshopper interface. (type Pachyderm_Acoustic in the command prompt to get started. Follow the instructions on the Pachyderm website)

There is an example in the Pachyderm RC12 archive:

Again, the Rhino and Grasshopper plugins talk to eachother, so you should have them both loaded, and you should have the Rhino model open before opening the grasshopper model.


Comment by Antonio Treglia on January 12, 2017 at 3:41am

Hi Arthur,

I'm sorry, I'm trying to set the model but I probably do something wrong. I saw that I need a source and at least one receiver for the simulation, but I don't know how to proceed. 

First of all, I have a simplified model of the stadium, and obviously it's an opened structure (you can see a part of it in the image below). To  the plug-in works, I need to create a kind of closed box around the structure?

Then, if it's possible, could you send me an example of a model where I can see how it works?

I'm really sorry but I'm completely new in this kind of software and analysis, and nobody in the department knows how to use this plug-in. Thanks for the patiance and the availability.

Comment by Arthur van der Harten on January 7, 2017 at 6:33pm


Try with 200,000 rays, and please post a screenshot of your impulse response. (You will find this on the third tab of the Hybrid method interface).

Comment by Antonio Treglia on January 7, 2017 at 9:35am

The total volume of the stadium is very huge, around 1,5 million mq. 
It will be minor than that, because I guess I'llconcentrate on the bleachers and the field, but it remains an high value.

Comment by Arthur van der Harten on January 7, 2017 at 7:20am

Hi Antonio,

For large spaces like that, Ray-tracing programs like that in Pachyderm are the only practical way to simulate sound. Yes it will work, but you will probably need a very large number of rays to adequately sample the space. What amount of volume are we talking about?


Comment by Antonio Treglia on January 7, 2017 at 7:11am


I'm starting to learn the plug-in, but before going on, I would ask you if it'll be useful for my project: I'm using acoustic analysis to recover the Rotterdam Stadium, changing it in a multifuncional building. I need to create a model of the stadium in GH to simulate the acoustics for different functions (as concerts, motor ride...), so I could use the results to improve the design and optimize the structure for all of these activities.

By the way, the literature about the acoustics of opened sport facilities is insufficient and I don't know if Pachyderm could help me in this research. Do you know if it works in a building with that dimensions?


Comment by Antonio Treglia on December 30, 2016 at 8:58am

I didn't find the .pset file but moving the "For Rhinoceros" folder on the Desktop it works. Thanks.

Comment by Arthur van der Harten on December 30, 2016 at 5:24am

Hi Antonio,

You will need the versions of the grasshopper and rhino plugins to be consistent, as they reference each other.
The .pset file is generated the first time you run Pachyderm for Rhino. Could you please confirm for me that it is there? If so, please delete it (so that Rhino can make its own). Make certain you have installed everything from v2 in your installation folder. 
Other than this, maybe your computer has locked the files, and you should go through the properties for each file and hit the 'unblock' button.
Let me know if you have gotten it working or if I can be of further help. 

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