yade-dev team mailing list archive

[Danny van der Haven <dannyvdhaven@xxxxxxxxx>]

Dear Bruno,

Thank you for forwarding, that sounds like a very interesting and useful
project!

I have been chatting to Vasileios about this as well, but I'm working on a
generalised package for making level set particles / objects and hope to
finish it in a month or two. I have also had some success in scanning in
some powders with microCT to get particle shapes.

   - The importing of level-set particles into YADE is currently something
   that I don't have a proper file format for; I just write things to a .csv
   file and load that using YADE's python interface. I will publish my script
   for this together with the package I am building.
   - Generating level-set particles from microCT is not a trivial task. If
   they want to supply these in their database, I recommend they wait until I
   have published the package (open source) and use that code.
   - For the package, I can deal with a lot of different input data
   already, as long as the individual particles are clearly labelled. Given
   the starting data is from microCT, the easiest input data is a single file
   per particle containing the binary voxel image of that particle. (The same
   applies to Vasileios' CLUMP library, I think.) Clumps, triangular meshes,
   and potential particles can all be converted to level sets. Converting an
   improper mesh to a level-set object will automatically close the mesh in an
   intuitive way.
   - I think Vasileios' CLUMP library also has a way to make
   meshed/polyhedral particles from images. Not sure if it works for concave
   particles, but an easy way to do this (maybe with a bit of overkill on the
   resolution) is to binarise the image and then apply marching cubes.

Are the people from Sand Atlas already involved with the ON-DEM project (
https://www.cost.eu/actions/CA22132/) ?

With kind regards,
Danny


Op di 30 jul 2024 om 14:20 schreef Bruno Chareyre <
bruno.chareyre@xxxxxxxxxxxxxxx>:

>
> Dear Yade devs,
>
> Benjy Marks/Sydney is providing grain shape data from CT on Sand Atlas
> website
> <https://url.au.m.mimecastprotect.com/s/yQb_C5QPXJiglW59xIzXERg?domain=sand-atlas.scigem.com/>
> and he is interested in making that data compatible with direct imports in
> shape models. It seems to me in requires a bit of work on either Yade or
> Sand Atlas sides, or both.
>
> IIRC Vasileios developed a tool to convert images into shape models
> already, Jérôme/Dany may have ideas for the case of level sets too. Others?
>
> 1/ Which would be the most basic and generic data format for raw data?
> (presumably voxel data)
> 2/ Which are the *available* functionalities to convert raw data into a
> DEM shape model?
> 3/ Which are the *unavailable* functionalities needed to convert raw data
> into a DEM shape model?
>
> Cheers
>
> Bruno
>
>
>
> -------- Forwarded Message --------
> Subject: Re: The Sand Atlas
> Date: Wed, 24 Jul 2024 18:54:53 +0000
> From: Benjy Marks <benjy.marks@xxxxxxxxxxxxx> <benjy.marks@xxxxxxxxxxxxx>
> To: Bruno Chareyre <bruno.chareyre@xxxxxxxxxxxxxxx>
> <bruno.chareyre@xxxxxxxxxxxxxxx>, Bruno.Chareyre@xxxxxxxxxxxxxxxxxxxxxx
> <Bruno.Chareyre@xxxxxxxxxxxxxxxxxxxxxx>
> <Bruno.Chareyre@xxxxxxxxxxxxxxxxxxxxxx>
> CC: Ilija Vego <ilija.vego@xxxxxxxxxxxxx> <ilija.vego@xxxxxxxxxxxxx>
>
> Hi Bruno,
>
> Essentially we have the 3D data from CT scans of the particles and we are
> willing to convert them into whatever shape models yade developers would
> prefer. I'm impressed that yade accepts 5 different shape models! We can
> certainly produce 5 different file types and have them all available if the
> yade team thinks that will be useful. The main point for us is to make all
> of this existing data available and useful for as many people as possible.
>
> Benjy
>
> ------------------------------
> *From:* Bruno Chareyre <bruno.chareyre@xxxxxxxxxxxxxxx>
> <bruno.chareyre@xxxxxxxxxxxxxxx>
> *Sent:* Thursday, July 25, 2024 1:10:28 AM
> *To:* Benjy Marks <benjy.marks@xxxxxxxxxxxxx> <benjy.marks@xxxxxxxxxxxxx>;
> Bruno.Chareyre@xxxxxxxxxxxxxxxxxxxxxx
> <Bruno.Chareyre@xxxxxxxxxxxxxxxxxxxxxx>
> <Bruno.Chareyre@xxxxxxxxxxxxxxxxxxxxxx>
> *Cc:* Ilija Vego <ilija.vego@xxxxxxxxxxxxx> <ilija.vego@xxxxxxxxxxxxx>
> *Subject:* Re: The Sand Atlas
>
>
> Dear Benjy,
>
>
> Thank you for the suggestion, it sounds interesting. It seems it all
> depends on which shape model would be used:
>
> - multisphere approximation
> - raw polyhedron
> - Minkowski polyhedron
>
> - potential particle
>
> - level set
>
> - (other things I can't imagine and which aren't implemented in Yade
> a.t.m.)
>
>
> That's five different "download for" already. :)
> Do I miss something?
>
>
> I'm not the most active in shape models actually. I should probably
> forward your proposition to other devs, or directly to yade mailing list.
>
> But before that could you clarify what sort of data you would provide /
> how close to shape models it would be?
>
> Kind Regards
>
>
> Bruno
>
>
>
> On 23/07/2024 00:51, Benjy Marks wrote:
>
> Hi Bruno,
>
> How are you? I hope you're well.
>
> We are putting together an open source repository called the Sand Atlas
> <https://url.au.m.mimecastprotect.com/s/yQb_C5QPXJiglW59xIzXERg?domain=sand-atlas.scigem.com/>.
> It is a website for hosting 3d models of particles, so that they can be
> used in DEM codes etc. I was wondering if this would be useful for YADE? If
> so, I would like to make it just a single click on our website where users
> can click "Download for YADE" and it gives them correctly formatted files
> so that they can be used seamlessly. We will try to do the same for other
> open source DEM codes too.
>
> The website now is more of a tech demo, many of the links dont work and
> the particles arent meshed that nicely, but this will all hopefully be
> sorted out in the next month. We also have asked around to a bunch of
> researchers and hope to have 50+ particle types available by September.
>
> If you have any feedback about the website, or ways that this kind of data
> might be useful to you or others, please let me know!
>
> thanks,
> benjy
>
> --
>
> *Bruno Chareyre*
>
> *Associate Professor *
>
>
>
>
>
> *Grenoble INP - UGA Institut d'ingénierie et de management / Graduate
> Schools of engineering and management 46 av. Félix-Viallet - 38301 Grenoble
> www.grenoble-inp.fr
> <https://url.au.m.mimecastprotect.com/s/mUDIC6XQ4LfVWGjm1u6CDu6?domain=grenoble-inp.fr>
> *
>
>
>
>
>
> *3SR Lab Soils, Solids, Structures, Risks 1270, rue de la piscine - 38400
> Saint Martin d’Hères www.3sr.univ-grenoble-alpes.fr
> <https://url.au.m.mimecastprotect.com/s/i5P-C71R2NTERW4NQuBAaiU?domain=3sr.univ-grenoble-alpes.fr>
> *
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