AFMG Network Forum

Guillaume.M · Member

Hi there,

I currently try to modelize the PA performance in a complexe train station.
I finished the model (5000 verticles, 3100 faces, >30 loudspeakers) and I can not get any clean architectural or standard rendering. I just have a few faces displayed on screen.

The graphic card of my laptop is maybe not enough powerfull? (NVIDIA 5200 M from a Latitude E6530).

How can I manage to get those renderings?

Thanks and regards,

Guillaume

AFMG Frank Siegmann · Member

Hi Guillaume,

did you import the model from another CAD format? If yes, export it one time to a DXF file and just re-import it again. That should fix the problem.

Kind Regards
Frank Siegmann
AFMG

kbasaran · Member

I have the same problem when I import large models from SketchUp and yes, Frank's solution does work. Is any other solution possible, like solving it in SketchUp in the first place?

Guillaume.M · Member

Hi Frank,

Yes I imported the model from skp. I tried with exporting/re-importing, the standard rendering is a little bit better, but I still have the major part of my model who is invisible.

Is there any subtlety I did not catch?

Thanks,

Guillaume[/quote]

Jim Mobley · Member

Hi Guillaume,

In Edit project, type a Z to go to straight down view. Do you now see the whole project? If so, you have a scaling problem, likely you've imported a model created in centimeters or millimeters as though it was meters, making your room several kilometers long.

Either re-scale the room in EASE: Tools > Rescale room, or re-import with the correct scaling.

Guillaume.M · Member

Hi Jim,

In Edit project, the room is perfect. I can see all the project.
I do not have any scale issue with my model.

Regards,

Guillaume

AFMG Pedro Lima · Forum Moderator

Guillaume, Hi

Would it be possible to send me the model for a quick review?

please send to pedro.lima [at] afmg dot eu.

Sincerely,
Pedro

Guillaume.M · Member

Hi Pedro,

File sent.

Regards,

Guillaume

AFMG Pedro Lima · Forum Moderator

Guillaume,

At first I thought maybe you would like to simulate direct sound, only.

But I have noticed that you have also applied materials to your Faces. Please have in mind that EASE expects an Acoustical Model, rather than an Architectural model.

The drawing has far too many details and has almost 3000 Faces. Even if you manage to solve that error, mapping and simulations involving reflections will probably not be practical.

The simulation time when including reflections is largely dependent on the number of Faces, especially for raytracing. An acoustical model is a simplified model where the simulations can be made practical without interfering significantly in the final result.

In addition to that, there are some inconsistencies as:
- Inverted Faces
- Face that must be Two-Fold that are not
- Faces covering the “outside” area of your “room” , as for instance the face below the main floor. Sound will not travel to it and thus is not necessary for the simulation, etc.

Also, sometimes one acoustical space is simulated at a time. To improve performance you can separate the top and floor areas into two different EASE projects.

Please refer to the EASE tutorial available here for more information about building a model:
http://ease.afmg.eu/index.php/documents.html

There are also some text books on this subject that might be usefull:
Auralization: Fundamentals of Acoustics, Modelling, Simulation, Algorithms ... - Michael Vorländer
Chapter 11 is one of the chapters you can take a look at.

I hope this helps.

Best Regads,
Pedro

Guillaume.M · Member

Hi Pedro,

I read the chapter and delete a thousand of faces. In addition, I removed all details below 0.5m.

The simulation is stile long, but I can manage to see everything on screen.

Thanks and regards.

Guillaume