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</style></div><div>Hi Jeremy,<br>Many many thanks for the tips!</div><div>>>> responses below<br>Best,<br>Fab.<br></div><div><br data-mce-bogus="1"></div><hr id="zwchr" data-marker="__DIVIDER__"><div><br data-mce-bogus="1"></div><div data-marker="__QUOTED_TEXT__">Hi Fab<br><div>Nice model! I'm not too sure you will find much of that sort of data but:</div><br><div>1. Braaudosphaera can be modelled entirely mathematically so could be a nice place to start.</div>>>> 1. Indeed Braarudosphaera is a good choice, along with "simple" Pg nannoliths (fasciculithus, rosette discoasters, etc). Neogene curvy discoasters will be technically more difficult I think along with Helico and all ornamented coccoliths.<br>>>> We aim at the Noelaerhabdaceae lineage (first step = reticulofenestra, and the gephyros by adding bridge elements at different angles and E/G hux by adding slits)<br>>>> Beyond the platic model (which is fun and appealing in a structural geology dept!) the objective is to make students understand which part of the coccos is variable (bridges, bars, slits, ecc) and which part is similar between taxa (basically a flat surface tilted and rotated n times, and then horizontally squeezed to make an oval). <br>Indirectly its the V/R model. <br><br><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>>>>I will check these refs.</div><div data-marker="__QUOTED_TEXT__"><br><div>3. In a way what you are doing is similar to what I did ages ago in 2-D - see Young 1989.</div><div> <!--StartFragment-->>>> I thought about Xray nanotomography papers but missed this (early Anthropocene) ref. I also had a look at the rotating nannofossils page on the ina.tmsoc website but it was difficult to properly make measurement (the models are very nice but… they rotate)</div><div><br data-mce-bogus="1"></div><div> If the CAD program is able to eliminate the parts of two solids which overlap</div><div> <!--StartFragment-->>>> The soft can do that (= the "difference()" command)<br><!--EndFragment--> </div><div>then I guess you mostly need to define the leading edge of each element and the profile across the coccolith </div>>>> Good idea but the result will be a flat distal shield surface, without the small steps between crystals.<br>>>> Anyhow, we will give it a try.<br><br><div>Jeremy</div><br><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><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>
<br>
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>
<br>
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>
<br>
Do such data even exist?<br>
<br>
Thank you in advance for any help!<br>
<br>
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><br>_______________________________________________<br>Coccoliths mailing list<br>Coccoliths@fcnym.unlp.edu.ar<br>https://webmail.fcnym.unlp.edu.ar/mailman/listinfo/coccoliths<br></div></div></body></html>