Pachyderm Acoustic

Comment

Comment by David Probst on April 26, 2018 at 5:12am

Hi Arthur and Pachyderm Community,

first of all I want to say thank you for providing us with free and open-source acoustic-simulation software. I am a student from Munich currently examining the acoustical effects of more complex, parametrical shapes; Without Pachyderm that would be very, very hard. However, I am running into a few problems and it would be awesome if you could find a few minutes to help me.

I am mainly using Pachyderm to try to find out the Alpha-Values and the Scattering-Coefficient of certain structures. Talking about the scattering analysis, I know that the feature is experimental, but I still think you might be able to clear a few things up. Generally, I understand the "Calculate up to"-Property as a frequency-treshold up to which the programm will calculate the correlation-coefficient. However, when I perform the calculations, Pachyderm does not respect these thresholds.

500hz: Pachyderm calculates 0 - ~7000hz

1000hz: Pachyderm calculates 0 - ~12000hz

2000hz: Pachyderm calculates 0 - ~30000hz

4000hz: Pachyderm calculates 0 - ~55000hz

To add to the confusion the values of the scattering coefficient will also change dependent on the threshold. I will attach all the files, the results and so on for these tests. I tried this with various structures, always had only one object with an assigned material in the center and the box did completely surround the object. Also just on a side note, the program crashes for me, whenever I am performing the analysis with a Mesh (Windows 10, Rhino5).

Furthermore, I could not find a common definition of the scattering coefficient. To me the definition "percentage of rays that is not reflected geometrically (+/- 10°)" makes a lot of sense; Does Pachyderm follow a similiar definition?

Since I am pretty new to CAD in general and definetly not an expert at all in neither acoustics nor simulation I have attached all the files that I used. Even though I have been testing around quite a bit, it might just be a really stupid mistake. I also did the tests with more complex surfaces (which I am actually interested in), but since the problems do already show for this simple rotated surface it might be a good place to start. I know this is a really long text, but I already tried to shorten it as much as I can, leaving a lot of other questions open. Thank you for any help!

ScatteringTests

All the best,

David

Comment by Arthur van der Harten on March 22, 2018 at 12:27pm

Hi Sang,

No worries. The software is not yet ready for Rhino 6... as a matter of fact, I haven't even ordered my copy of 6 yet. I will port it within the next few months if I am able to muster the time to do so.

Arthur

Comment by Sang Bum Park on March 22, 2018 at 12:23pm

Hi Arthur,

Thank you very much sharing Pachyderm Acoustic plugin! I am looking forward to digging it, although I have not used it yet due to Rhino version issue, I guess. Does Pachyderm work with Rhino 6 as well? I have tried to install it but the error message says that it seems not compatible with Rhino 6. I could see them in Grasshopper though. Any idea?

Thanks,

Sang

Comment by oneiric on December 11, 2017 at 12:02am

Hi Authur,

Thanks so much for your reply.

Now I have already know how to save the data and read the data in gh and had no prob with NURBS scene

I would like to know what is the data to be connected to Room in Visualize Pachyderm Rays component? From the hint when I tried to connect brep to Room, I connected NURBS scene to it. It gives me the error saying 'Object reference not set to an instance of object'

Sorry for the trouble to have to explain to me step by step...

Thanks!!!

Comment by Arthur van der Harten on December 5, 2017 at 7:29am

Hi Oneiric,

GL wants one integer for each piece of geometry you put into GG. This integer will be the zero-based position of the layer in the Rhino layer dialog. The layer titled 'default' generally appears first in a new document. That would be layer 0. The next layer you add would be directly below 'default' and would be layer 1, and so on.

What the scene component is looking to do is get the materials you have assigned to that layer in Pachyderm for Rhino. This is the most obvious way, perhaps that Pachyderm for Rhino and Pachyderm for Grasshopper work together. They share resources like materials.

The connection will be deepened in the future, as I develop certain other tools. Stay tuned.

Arthur

Comment by oneiric on December 4, 2017 at 5:21am

Hi Authur,

Thanks for your creation of this plug-in. 

I have read all the tutorial on the website and the comments & discussions here. I do not see how gh and rhino plugin could work together. Is there any example for me to learn more about it ?

Or may I know for NURBS Scene component, what should be plugged into GL? What is the integer id of the layer in the description?

Thank you!

Comment by Abdulaziz Albasseet on September 26, 2017 at 8:57am

Where can i download?

Comment by Han Deng on September 24, 2017 at 11:44am

Hi，I want to figure out how to use it in grasshopper, could you sent me the example file of grasshopper to my email?

hdeng@iastate.edu

Thanks very much!

Comment by Arthur van der Harten on July 23, 2017 at 5:44pm

Hi all,

Daniele and I have worked through the issue. It seems to me that this is not terribly clear in the website documentation, so I will say it here. Your model must be in meters for it to work correctly in Pachyderm. Maybe someday I will fix this, but for now, in order to prevent  an onslaught of bugs, please work in meters.

Rhino makes it pretty easy to fix this. I can be a little trickier in Grasshopper, but still not overly complicated.

kind regards,

Arthur

Comment by Daniele Rizza on July 23, 2017 at 11:25am

Can you send me your email to send you the project?
Or write it at rizza.d@hotmail.it
Thank you

Kind regards,

Daniele 

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