mamlambo Posted February 24 Share Posted February 24 I've always wondered what a crab concretion would look like when it was CT scanned and had the chance to do so recently thanks to the friendly people at Pacific Radiology here in New Zealand. The concretion contains a Tumidocarcinus giganteus crab from the Miocene of New Zealand. Here is the concretion I scanned, the legs were visible on the side so I knew a crab was inside: One of the slices of the crab after I loaded the DICOM images into 3D slicer. There were 203 slices. By segmenting the images, telling the program what is rock and what is not rock, you can create a 3D image for import into Blender or other 3D images to prepare it for 3D printing. The 3D mesh was made up of 770 142 triangles. After making it manifold (water-tight), I imported it into Cura to generate the GCODE for my 3D printer. It also adds supports to be able to print overhangs. Here is the 3D printed crab sitting outside the concretion. It is accurate in size. I also scanned a penguin concretion which is on my Sketchfab profile (https://sketchfab.com/3d-models/fossil-penguin-ct-scan-segmentation-take-2-dd9cb20684d4471dad2757ab8a53a548) Here is the video of the process: You can look at the 3D model on Sketchfab: https://sketchfab.com/3d-models/ct-scan-of-fossil-crab-inside-concretion-25f26cb23a6046419521ed2422d5741d 2 19 Link to comment Share on other sites More sharing options...
Pagurus Posted February 24 Share Posted February 24 Unbelievable. But heck, I was amazed when my dad brought home our first black and white TV. 2 Start the day with a smile and get it over with. Link to comment Share on other sites More sharing options...
Coco Posted February 24 Share Posted February 24 Hi, Incredible ! Coco 1 ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
Brian James Maguire Posted February 24 Share Posted February 24 Fantastic stuff! Really cool 1 Link to comment Share on other sites More sharing options...
jdp Posted February 25 Share Posted February 25 That penguin is fantastic. Crab's nice too 1 Link to comment Share on other sites More sharing options...
Ludwigia Posted February 25 Share Posted February 25 Amazing what it's sometimes possible to create nowadays! 1 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Yoda Posted February 25 Share Posted February 25 Amazing what can be done these days! 1 MotM August 2023 - Eclectic Collector Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted February 25 Share Posted February 25 I hope you do eventually prep the crab -- it looks great. Mark. Fossil hunting is easy -- they don't run away when you shoot at them! Link to comment Share on other sites More sharing options...
jpc Posted February 25 Share Posted February 25 cool. When you say you segmented it, did you manually go through all 203 slices, or does 3D slicer do that for you? I have only started to mess with the program... downloaded it but have not found time to use it. Heck, I should go try it instead if doing this.... Link to comment Share on other sites More sharing options...
mamlambo Posted February 25 Author Share Posted February 25 1 hour ago, jpc said: cool. When you say you segmented it, did you manually go through all 203 slices, or does 3D slicer do that for you? I have only started to mess with the program... downloaded it but have not found time to use it. Heck, I should go try it instead if doing this.... When you apply a segmentation, it can do some of the work for you but with fossils there sometimes isn't great contrast between the rock and the fossil so you have to go in and do some manually. It doesn't take too long. Link to comment Share on other sites More sharing options...
mamlambo Posted February 25 Author Share Posted February 25 4 hours ago, Mark Kmiecik said: I hope you do eventually prep the crab -- it looks great. I have a few bigger ones that I have to do first Link to comment Share on other sites More sharing options...
aplomado Posted February 26 Share Posted February 26 Well, that certianly looks easier than the way dirt-dauber does it! Link to comment Share on other sites More sharing options...
LordTrilobite Posted February 27 Share Posted February 27 Nice! Great to see such effective use of CT scanning and 3d printing. 1 Olof Moleman AKA Lord Trilobite Link to comment Share on other sites More sharing options...
jpc Posted February 27 Share Posted February 27 Wow... I just looked at your penguin concretion 3d you mentioned in the first post... that is a great specimen! 1 Link to comment Share on other sites More sharing options...
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