Grasshopper

algorithmic modeling for Rhino

Pachyderm Acoustic

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Pachyderm Acoustic

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

Website: http://www.perspectivesketch.com/pachyderm
Location: Earth
Members: 4
Latest Activity: on Monday

Discussion Forum

Installation issues 1 Reply

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. Last reply by Devang Chauhan on Monday.

Auralization

Pachyderm incorporates auralization (the rendering audible of a simulated room). Please feel free to share your creations here, and/or ask questions.Continue

Started by Arthur Dec 30, 2016.

Materials Designer

Pachyderm incorporates a Materials designer which uses a transfer matrix system to calculate the absorption of a given finish material assembly. Feel free to ask questions about this here.Continue

Started by Arthur Dec 30, 2016.

Pachyderm Numeric_Time_Domain

This is a location where we can discuss anything to do with the Numerical simulation tools available in Pachyderm. Please feel free to play around, comment, ask questions, make suggestion, etc.Continue

Started by Arthur Dec 30, 2016.

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Comment by Antonio Treglia on Monday

After the installation it is more stable.

I use the simple model that I showed you: with only one material for all the objects, reflection order=1, number of rays=200000, cot=10000ms (less than that appears the message "indice oltre i limiti della matrice") this is the result of the analysis.

 

Comment by Antonio Treglia on Monday

I'm using the 64-bit Rhino in Windows, and I have 16Gb RAM, I don't think that is the problem. I noticed that the crash comes when starts "calculating image set..".

I'll try to install again pachyderm and also Rhinoceros if it's necessary.

Comment by Arthur on Monday

My colleages at the office and I use the plugin often. It shouldn't be unstable. The only times I encounter this with users is generally if they are running in Parallels on a Mac, and that is a Rhino issue. Another possibility is that you don't have enough RAM to do what you want to do, or you are running in 32 bit, in which case the RAM you can use is limited (try again in 64-bit Rhino). If that is not the case, here are a few things to try:

1. check that none of the libraries are blocked. (right click all files in the installation and go to properrties, and if there is an unblock button in propertites, click it and apply.)

2. delete the .pset file in the pachyderm directory. (Pachyderm will make a new one).

3. Delete your Pachyderm directlory, and install again from the RC12 archive I provided earlier.

As for the blank receivers dropdown, I had forgotten about that issue. Just click in the white space of the dropdown and type the number of the receiver you want, and press tab. Then uncheck and check a source. That should work as a temporary workaround. (don't put in a number that does not match a receiver in the model, or it will crash). This will be fixed in a later version.

Comment by Antonio Treglia on Monday

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 Monday

Hi,

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 on Friday

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:

https://dl.dropboxusercontent.com/u/21521713/Pachyderm2.0.0.1%20RC1...

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.

--Arthhur

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 on January 7, 2017 at 6:33pm

Hi,

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 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?

Arthur

 

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