#Photogrammetry 3D Model

[pointprecise2022]

Photogrammetry 3D Model

Point Precise uses photogrammetry and your iPhone’s device sensors to convert your scans into precise 3D point clouds.

[wangleline]

Made this in blender

[wild-e-eep]

If you need the 3d for extra twiggishness, here it is.

(warning: it is a 78Mb download, I need to look into reducing my 3d scan file sizes.)

This distinctively warty lichen is Melanohalea exasperata (with several friends) on a lushly populated oak twig.

It can be tricky to find as it mostly grows high up in the tree canopy - so far I've only enountered it on branches that have recently fallen to the ground.

[ryojikagi]

Iwazaru (jap. 言わざる) - “does not speak” https://skfb.ly/oWPNS

[tueq]

The Offer That Can't Be Refused

[southeastasianarchaeology]

Get Certified in Photogrammetry with CyArk's Heritage Documentation Training Grant

CyArk's new grant offers free 3-week virtual training in photogrammetry for cultural heritage preservation. Earn a certificate & software licenses.

CyArk has introduced the Heritage Documentation Training Grant, aimed at empowering individuals with digital documentation skills for cultural heritage preservation. The grant offers a three-week intensive virtual training program, complete with complimentary photogrammetry software licenses and 20 hours of live sessions. Participants will earn a certificate in photogrammetry and apply their…

[blueiscoool]

Rare 16th-Century Shipwreck Discovered at Record Depth in French Waters

The wreck was laden with hundreds of ceramic pitchers and plates.

French archaeologists have discovered the remains of a 16th-century merchant vessel 1.6 miles below the surface of the Mediterranean Sea, the deepest such find ever made in French waters.

Back in March, the French Navy was carrying out a routine mission off the southeastern coast to explore and monitor the country’s resources, ranging from deep-sea minerals to subsea cables, when an unusually large shape appeared on sonar. It sent an underwater drone fitted with a camera to investigate which soon revealed high-resolution images of a shipwreck laden with hundreds of ceramic pots. The sunken vessel has initially been named Camarat 4 in reference to the nearby Cap Camarat headland which lies less than 10 miles south of Saint Tropez.

Next, the Navy forwarded the images to France’s Department of Underwater and Submarine Archaeological Research (DRASSM), the branch of the French Ministry of Culture which is responsible for underwater archaeology. DRASSM sent its own remotely operated vehicle to explore the site further and announced in early June that Camarat 4 is a 98-foot-long and 23-foot-wide merchant ship that sank nearly 500 years ago.

“Time has stood still here in the deep sea since the 16th century,” DRASSM said in a statement. “The wreck was beyond the reach of salvaging operations and at this depth the vessel has been preserved from all forms of degradation, most notably looting. It represents a unique research opportunity.”

High-quality images allowed experts to closely analyze the cargo of the ship which is comprised of roughly 200 polychrome earthenware pitchers and 100 plates. The pitchers sport pinched spouts and ribbon-shaped handles. Some boast geometric or botanical designs, and others bear the letters “HIS,” representing the first three letters of Jesus Christ’s name in Greek. Together, these elements are characteristic of 16th-century ceramic production in Liguria, a coastal region in northwest Italy near to the French border. DRASSM also identified an anchor, iron bars, six cannons, and two cauldrons.

For centuries, this stretch of the Mediterranean was a heavily travelled maritime route and Camarat 4 joins Lomellina, a Genoese ship that sank in 1516, and the Sainte-Dorothéa, a 50-gun Danish frigate that sank in 1693, that have been discovered in the area.

The next stage will see DRASSM build a multidisciplinary team including historians, geologists, and archaeologists and work to create a 3D model of the ship using photogrammetry, the process of stitching together hundreds of images. Some of the questions experts hope to answer include: is there more undiscovered cargo, how did ship sink, and why does it only have one anchor?

Beyond exploring Camarat 4 for historical interest, DRASSM also intends to use the upcoming project to raise awareness about the ills of sea pollution. Tellingly, alongside the 500-year-old ceramics were plastic bottles and yogurt pots.

By Richard Whiddington.

[6000yearstogether]

What they are doing here is called Photogrammetry!

It means that they are doing a 360° scan of his body so they can create a 3D model!

If you want to read more about this process, you can look into this site, it explains it perfectly:

https://www.newworlddesigns.co.uk/full-body-photogrammetry-scanning/

[andmaybegayer]

Are there any primitives or operations you wished parametric CAD software had?

This is tricky, because parametric CAD is what I learned to design on so its feature set feels "natural".

I don't really think so! Most of the obvious innovations are already covered, SolidWorks can take a model back and forth between parametric and primitives modelling in its own weird way, Inventor has really great design for manufacture features, from what I've seen SolidEdge has done some clever stuff with the solver to help you design parts that are customizable as you go down the chain. Who knows what's going on in NX these days, not me. There's definitely some holes in the sense of individual packages lacking features, but almost anything you can ask has been implemented somewhere, by someone.

Good quality design for manufacture tools really do help, I remember doing sheet metal stuff in Inventor back before they cut off free Inventor access and being able to see your generated sheet and bend allowances so clearly was great, and now even OnShape has pretty solid design helpers.

A thing small shops and hobbyists would probably like is better handling of point clouds and photogrammetry for matching parts, since you're much more likely to be working with parts and projects where you didn't do all the design, I've spent many hours trying to accurately model a mating feature, but even that's like. Pretty good these days, importing 3D scans into an editor is pretty standard and the good CAD packages will even let you pick up holes and clean up point clouds directly from the scan.

I'm not that much of a mech eng, and never really was, my CAD is mostly self taught for simple tasks, real mechanical designers no doubt have better opinions on this, @literallymechanical probably has thoughts on T-splines.

[trollbite]

Friends, this has been an exciting (and tiring) journey of learning. My thoughts below.

1. Hand sculpt in Fimo polymer clay.

2. Raw 3D scan by photogrammetry.

3. Refined model (using Blender).

4. Resin print.

First of all, sculpting in polymer clay is such a great experience compared to epoxy putties. There is no prep time because the material is ready to go and I can stop anytime because the working time is infinite. Wonderful! I had hoped to get much closer to a finished model on the physical sculpt, but I just lack the skill at this point. Also, knowing I would scan it, I didn't worry too much about things that I could easily fix digitally. I would like to try and sculpt at 2x scale. 

3D scanning with photogrammetry sucks. There are many steps you have to get right and many pictures to take. Processing the images also takes a few hours and if you get something wrong, you might need to start over. My scan is very rough but it was good enough.

I 3D sculpted in Blender. It's open source and I love that. I didn't think I was going to do so many changes, but once I started it was hard to stop tweaking it. I wanted to make it as good as a model done by pros and that is very hard. This is my fourth print and there are still things I want to change, but I want to paint this one first. The screen is very deceiving: it's so much easier to spot problems when I hold the model in my hand. That was frustrating, because I don't really like the process of resin printing. Anyway, I think painting will reveal what else needs changing.

Will I sell it? Probably yes. If so, it will be STLs at this point. But I did try to keep the undercuts to a minimum just to see if I could make something that could be cast in 1-2 pieces.

Will I do more? I hope so, but it has been exhausting and I want a break. I really want to see it painted at this point.

[metalobrukht]

@harris0247

[timdrakequotes]

Black Bat: How are your matches?

Red Robin: Nothing yet. We don’t really have a clear angle of the suit for the software to pull from. So I’m trying to build a 3D model from different angles. Which is way easier said than done.

Black Bat: It’s what you do. You’ll figure it out.

Red Robin: What does that mean?

Black Bat: It means you’re good at it. It’s part of your niche. And they all know it.

Red Robin: I get the feeling we’re not really talking about photogrammetry here.

Black Bat: Sorry, just thinking out loud…

--Tim Drake with Cassandra Cain (Batman: Gates of Gotham #2 – Part Two: The Four Families of Gotham)

[wild-e-eep]

Exciting progress on 'photogrammetry of very small things' this evening: I have devised a simple, but effective rostrum for photographing tiny subjects from every angle.

Rostrum made from a flower pot, 2 cardboard circles and a wine cork. Lighting from a very small torch fastened to the rig by a rubber band; there is a white sticky label on the light to make the lighting more diffuse.

Subject: a shrivelled, dry Cladonia caespiticia specimen. Small… and very frilly. The ruler is in cm, not inches.

Here is one of the 60 source photos used to construct the 3d model.

...and the result:

A really quite detailed 3d model generated from 60 photos taken from various angles. I used Apple's free 3d Scanner App which is easy to use and the results seem okay so far. :0)

Follow this link to see the model in a 3d viewer.

Here's another one done on a cloudy day with no artifical lighting:

This is a seastorm lichen - Cetrelia cetraroides - you can view it in 3d here.

You can download the model files from this dropbox if you would like to view them with a VR headset or other 3d application.

[ryojikagi]

Kikazaru (jap. 聞かざる) - “does not hear” https://skfb.ly/oWOwQ

[pivsketch]

drawing crossed arms is tricky so i opened up some 3d models on sketchfab and drew my TAGCEN guys crossing their arms. from various angles. perhaps i will learn something

if you dont know: tons of people do photoscan/photogrammetry stuff and upload it to sketchfab as a 3d model that you can freely rotate around and view in your browser. its really good for reference!!

[mindblowingscience]

Research in recent decades has revealed a great deal about the cultural complexity of Neanderthals. However, relatively little is known about their symbolic or artistic expression. Only a short list of symbolic productions are attributed to Neanderthals, and the interpretation of these is often the subject of debate. In this study, Marquet and colleagues identified markings on a cave wall in France as the oldest known Neanderthal engravings. The cave is La Roche-Cotard in the Center-Val de Loire of France, where a series of non-figurative markings on the wall are interpreted as finger-flutings, marks made by human hands. The researchers made a plotting analysis and used photogrammetry to create 3D models of these markings, comparing them with known and experimental human markings. Based on the shape, spacing, and arrangement of these engravings, the team concluded that they are deliberate, organized and intentional shapes created by human hands. The team also dated cave sediments with optically-stimulated luminescence dating, determining that the cave became closed off by infilling sediment around 57,000 years ago, well before Homo sapiens became established in the region. This, combined with the fact that stone tools within the cave are only Mousterian, a technology associated with Neanderthals, is strong evidence that these engravings are the work of Neanderthals.

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