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Old 16th July 2019, 07:14 AM   #111
mabat is offline mabat  Czech Republic
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What I meant was the simulation trustworthiness. I know that domes may actually work fine (although with much less headroom than CD).

I can easily make the throat driving element in a shape of a dome tweeter. I'm just not so sure about how the acoustic results will match the reality. Anyway, let's try. I guess I will just use some weighting for the surround output contribution.
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Old 16th July 2019, 12:30 PM   #112
mrk7 is offline mrk7  Australia
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Originally Posted by mabat View Post
simulation trustworthiness...
.


Have you built anything based on the Ath4 software to validate the modelling thus far?
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Old 16th July 2019, 12:53 PM   #113
Gaga is offline Gaga  Europe
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Well...
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Have you built anything based on the Ath4 software to validate the modelling thus far?
...when it comes to conformance of modelling and measurement of the final built, then ABEC has to be discussed, not Ath4. Ath4 just makes it easier to built an ABEC model, i.e. helps with the input to ABEC. Here based on an OS-waveguide.

When it comes to AEBC: This software can do very precise modelling, depending on the level of detail of the model and some experience...
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Old 16th July 2019, 12:54 PM   #114
mrk7 is offline mrk7  Australia
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Has anyone had success creating a high quality CAD solid part from an Ath4 project stl file?



So far I've tried using Meshmixer to convert a hi-resolution mesh to a solid but always end up having to sacrifice detail in order for Meshmixer to be able to successfully convert it into a solid.


Any tips or tricks would be great!
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Old 16th July 2019, 12:57 PM   #115
Gaga is offline Gaga  Europe
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Has anyone had success creating a high quality CAD solid part from an Ath4 project stl file?
Patrick has some experience here. I was not very successful to start from a *.stl-file so far. I very much prefer *.step-files.
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Old 16th July 2019, 01:04 PM   #116
mabat is offline mabat  Czech Republic
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Originally Posted by mrk7 View Post
Have you built anything based on the Ath4 software to validate the modelling thus far?
From the previous experience with different OS waveguides I can see a lot of resemblence, especially regarding the axial ripple and diffraction issues. That I would quite believe but I yet have to build a horn based on ath4 exactly 1:1.

This is one existing horn built based on ath4 algorithm:
hifi.slovanet.sk :: Zobrazi? t?mu - Projekt STH12 (2p - 12"+1"@STH zvukovod by MaBat) (see measurements down the page)

So when ABEC shows nice and smooth polars, I would believe it couldn't get much better...
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Old 16th July 2019, 01:09 PM   #117
mabat is offline mabat  Czech Republic
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Patrick has some experience here. I was not very successful to start from a *.stl-file so far. I very much prefer *.step-files.
I believe you could well proceed with point cloud(s). Just give me few days to finish.
We have already done that with jzagaja, it worked nicely: hifi.slovanet.sk :: Zobrazi? t?mu - Zvukovody STH - teorie a praxe
(But I still don't know how to do that - I'm not a CAD user.)
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Old 16th July 2019, 01:12 PM   #118
Gaga is offline Gaga  Europe
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I believe you could well proceed with point cloud(s). Just give me few days to finish.
Thanks a lot for your work again, just take the time you need. I'll try starting from a point cloud then...
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Old 21st July 2019, 03:50 AM   #119
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by Gaga View Post
Patrick has some experience here. I was not very successful to start from a *.stl-file so far. I very much prefer *.step-files.
As Gaga has taught me so much, it's only fair that I make a stab at this!

Here's what I came up with:

3D Modeling Tips and Tricks
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Old 21st July 2019, 09:19 AM   #120
mabat is offline mabat  Czech Republic
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That is great, Patrick (or John). The first step, i.e. converting STL to solid, can also be easily automated. I'll definitely do that, to generate the STL as solid right away, I just have been quite busy for the last several months so not much work has been done on ath4.

What also seems needed is to have an increasing number of points as approaching the mouth to have the STL smooth enough everywhere. It "only" requires a complete rewriting of the code that generates the mesh - something I saw from the start but tried to avoid for as long as possible. I didn't consider STL as a format suitable for 3D modeling, but it seems a lot of people will want to use it directly as it is. It should also help with the BEM however.
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