<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Fab<div><br></div><div>Nice model! I'm not too sure you will find much of that sort of data but:</div><div><br></div><div>1. Braaudosphaera can be modelled entirely mathematically so could be a nice place to start.</div><div><br></div><div>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</div><div><br></div><div>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 </div><div><br></div><div>Jeremy</div><div><br></div><div><span style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px; background-color: rgb(255, 255, 255);">Avrahami, E. M., Houben, L., Aram, L. & Gal, A. (2022). Complex morphologies of biogenic crystals emerge from anisotropic growth of symmetry-related facets. </span><i style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px;">Science. </i><span style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px; background-color: rgb(255, 255, 255);"></span><b style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px;">376</b><span style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px; background-color: rgb(255, 255, 255);">: 312-316.</span></div><div><div style="text-indent: -40.799999px;"><span style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px; background-color: rgb(255, 255, 255);"> <span class="Apple-tab-span" style="white-space:pre"> </span> Young, J. R., Henriksen, K. & Probert, I. (2004). Structure and morphogenesis of the coccoliths of the CODENET species. </span><i style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px;">In</i><span style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px; background-color: rgb(255, 255, 255);">, Thierstein, H. R. & Young, J. R. (eds) </span><i style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px;">Coccolithophores - From molecular processes to global impact. </i><span style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px; background-color: rgb(255, 255, 255);">Springer, Berlin 191-216.</span></div><div style="text-indent: -40.799999px;"><span style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px; background-color: rgb(255, 255, 255);">Y Young, J. R. (1989). Observations on heterococcolith rim structure and its relationship to developmental processes. </span><i style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px;">In</i><span style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px; background-color: rgb(255, 255, 255);">, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. </span><i style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px;">British Micropalaeontological Society Publication Series </i><span style="font-family: Geneva, Tahoma, sans-serif; font-size: 10.2px; text-indent: -40.799999px; background-color: rgb(255, 255, 255);">. 1-20.</span></div><div><br><blockquote type="cite"><div>On 12 Oct 2023, at 16:39, Fabrice MINOLETTI <fabrice.minoletti@sorbonne-universite.fr> wrote:</div><br class="Apple-interchange-newline"><div>
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<div>Dear all,<br>
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I'm working with (geo)student of the FabLab here in Paris.<br>
Their objective is to construct 3D models of coccoliths for teaching purpose.<br>
These models are made with OpenSCad and use simple volumes (squares, cylinders, polygons) and simple operations (rotation, translation, ecc).<br>
The downside of this approach is that we need quantified morphological parameters as dimensions and angles of the crystal elements.<br>
Attached are some images of a preliminary test on C.leptoporus to validate the approach. Coccolith interlock quite well to form a full coccosphere.<br>
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Does anyone know were we can find such morphological data?<br>
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<br>
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Do such data even exist?<br>
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Thank you in advance for any help!<br>
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All the Best,<br>
Fabrice.</div>
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Fabrice MINOLETTI, PhD<br>
Maître de Conférences HDR – Sorbonne Université<br>
Institut des Sciences de la Terre de Paris (ISTeP - UMR 7193)<br>
Campus Pierre et Marie CURIE, Paris, France</div>
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Fabrice MINOLETTI, PhD<br>
Maître de Conférences HDR – Sorbonne Université<br>
Directeur Master STePE Portail SDUEE<br>
Co-responsable Parcours-type Géosciences et Planétologie (GEO-P)<br>
Institut des Sciences de la Terre de Paris (ISTeP - UMR 7193)<br>
Equipe Terre/Mer: Structure et Archive<br>
Campus Pierre et Marie CURIE<br>
T56-55 5eme - Case 116 - 4, Place Jussieu 75252 Paris cedex 05<br>
Tel: +33 (0)1 44 27 27 60<br>
Site Web http://www.istep.upmc.fr<br>
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<span id="cid:F0BB2192-7C75-48E2-948E-20C71CAC9C32"><Clept.png></span><span id="cid:7EDDEA3C-F844-4305-84D3-8BE864143A17"><Clept1.png></span><span id="cid:DFBD7794-CF5C-49D6-B25C-D50BF0D67827"><Clept2.png></span>_______________________________________________<br>Coccoliths mailing list<br>Coccoliths@fcnym.unlp.edu.ar<br>https://webmail.fcnym.unlp.edu.ar/mailman/listinfo/coccoliths<br></div></blockquote></div><br></div></body></html>