[coccoliths] morphometrics for 3D printing

[Young, Jeremy]

Hi Fab

Nice model! I'm not too sure you will find much of that sort of data but:

1. Braaudosphaera can be modelled entirely mathematically so could be a nice place to start.

2. In the particular case of the C. lept distal shield the faces are all rhombohedral calcite a faces so you can derive most of the angles simply from that - but maybe that is what you have done already? Two references for this are Young et al 2004 and Avrahami et al 2022

3. In a way what you are doing is similar to what I did ages ago in 2-D - see Young 1989. If the CAD program is able to eliminate the parts of two solids which overlap then I guess you mostly need to define the leading edge of each element and the profile across the coccolith  

Jeremy

Avrahami, E. M., Houben, L., Aram, L. & Gal, A. (2022). Complex morphologies of biogenic crystals emerge from anisotropic growth of symmetry-related facets. Science. 376: 312-316.
     	    Young, J. R., Henriksen, K. & Probert, I. (2004). Structure and morphogenesis of the coccoliths of the CODENET species. In, Thierstein, H. R. & Young, J. R. (eds) Coccolithophores - From molecular processes to global impact. Springer, Berlin 191-216.
Y          Young, J. R. (1989). Observations on heterococcolith rim structure and its relationship to developmental processes. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series . 1-20.

> On 12 Oct 2023, at 16:39, Fabrice MINOLETTI <fabrice.minoletti at sorbonne-universite.fr> wrote:
> 
> ⚠ Caution: External sender
> 
> 
> Dear all,
> 
> I'm working with (geo)student of the FabLab here in Paris.
> Their objective is to construct 3D models of coccoliths for teaching purpose.
> These models are made with OpenSCad and use simple volumes (squares, cylinders, polygons) and simple operations (rotation, translation, ecc).
> The downside of this approach is that we need quantified morphological parameters as dimensions and angles of the crystal elements.
> Attached are some images of a preliminary test on C.leptoporus to validate the approach. Coccolith interlock quite well to form a full coccosphere.
> 
> Does anyone know were we can find such morphological data?
> For example: angle of kinks, angle between distal shield elements and the plane of coccolith, space between proximal and distal shield, width of tube elements, ecc, ecc
> 
> Do such data even exist?
> 
> Thank you in advance for any help!
> 
> All the Best,
> Fabrice.
> 
> 
> - - - - - - - - - - - - - - - - - -
> Fabrice MINOLETTI, PhD
> Maître de Conférences HDR – Sorbonne Université
> Institut des Sciences de la Terre de Paris (ISTeP - UMR 7193)
> Campus Pierre et Marie CURIE, Paris, France
> 
> 
> - - - - - - - - - - - - - - - - - -
> Fabrice MINOLETTI, PhD
> Maître de Conférences HDR – Sorbonne Université
> Directeur Master STePE Portail SDUEE
> Co-responsable Parcours-type Géosciences et Planétologie (GEO-P)
> Institut des Sciences de la Terre de Paris (ISTeP - UMR 7193)
> Equipe Terre/Mer: Structure et Archive
> Campus Pierre et Marie CURIE
> T56-55 5eme - Case 116 - 4, Place Jussieu 75252 Paris cedex 05
> Tel: +33 (0)1 44 27 27 60
> Site Web http://www.istep.upmc.fr
> <Clept.png><Clept1.png><Clept2.png>_______________________________________________
> Coccoliths mailing list
> Coccoliths at fcnym.unlp.edu.ar
> https://webmail.fcnym.unlp.edu.ar/mailman/listinfo/coccoliths

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://webmail.fcnym.unlp.edu.ar/pipermail/coccoliths/attachments/20231012/c177b13c/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 1484 bytes
Desc: not available
URL: <http://webmail.fcnym.unlp.edu.ar/pipermail/coccoliths/attachments/20231012/c177b13c/attachment.bin>