inka-road

February 10, 2016

3D Scans of Inka Stonework—Live Online at SI X 3D

Capturing 3D data in Cusco, Peru
Jon Blundell, a 3D digitization specialist at the Smithsonian, capturing 3D data points of the Inka archaeological site at Pisac. Pisac, Peru, 2014. Photo by Samy Chiclla.

If you visit Cusco, Peru, the monumental stonework of the Inka capital will give you a sense of the Inka's imperial ambition. If you come to the National Museum of the American Indian in Washington, D.C., the exhibition The Great Inka Road: Engineering an Empire will show you how the architecture of Cusco reflects the empire's understanding of the Andean environment and principles of construction, as well as political administration. 

But what if you never travel to Peru or Washington? You can visit the exhibition website in English and Spanish or read the companion book of essays. Or, for the first time for this museum, you can experiment with a set of three-dimensional digital models of sites in Cusco, created by the 3D staff of the Smithsonian’s Digitization Program Office

The Cusco models are part of a much larger effort to make the research and collections of the Smithsonian Institution more widely accessible. The institution houses more than 138 million objects, artworks, and scientific specimens. At any given time, less than one percent of these objects are on display. Working with the Smithsonian’s 19 museums, nine research centers, and National Zoo to prioritize material for digitization, the Digital Program Office has set a goal of making ten percent of the collections available online, primarily as two-dimensional digital images. Smithsonian X 3D is targeting far fewer objects. But with web browsers now capable of supporting 3D imagery through webGL, Smithsonian X 3D is breaking new ground.

The Smithsonian X 3D website includes models, as well as a gallery of behind-the-scenes videos about 3D technology in a museum and science setting. Smithsonian X 3D's Inka Road page houses 3D images of stonework from five sites around Cusco, with notes and videos keyed to details of each site and, for Saqsaywaman, a brief tour: 

Waka Pachatusan, a sacred site near Cusco on the road to the province of Antisuyu: 

 


A section of Inka stonework along Hatunrumiyoc Street, including the 12-angled stone that epitomizes Inka dry-stone masonry: 

Screen shot of Hatunrumiyoc


A section of the original wall of the Qorikancha, the religious center of the empire: 

Screen shot of the Qorikancha


A section of wall at Saqsaywaman, the temple of the sun in upper Cusco: 

Screen shot of Saqsaywaman


And an Inka double-jamb doorway, one of three still standing:

Screen shot of the double jamb doorway


To create these models, Smithsonian 3D digitization specialist Jon Blundell joined the museum’s Inka Road project team in Cusco during the summer of 2014. Dr. Ramiro Matos (Quechua), an Andean archaeologist and co-curator of The Great Inka Road, and consulting scholars and other museum specialists on the project team worked with Jon to identify sites around the city for 3D imaging. This was the museum’s first use of 3D scanning technology. “Identifying sites was collaborative,” Jon says. “The team knew that 3D scanning was a tool they wanted to deploy to tell the story. It was interesting to work with them to figure out, What is here that would be compelling as a 3D model, could be captured in the time we have, and has a story behind it?” Once the team had selected the sites, Jon used a combination of laser scanning and photogrammetry—a technique that uses digital cameras and specialized software to create 3D data—to record the surface of each site as billions of 3D data points. 

Jon Blundell on Hatunrumiyoc Street
Jon checking his work on the double-jamb doorway. Cusco, Peru, 2014. Photo by Samy Chiclla.

The Smithsonian X 3D team has digitized other large sites—colonial church burials in Jamestown, Virginia, and a field of fossil whales uncovered at Cerro Ballena, Chile—but working in an urban setting presented different challenges. The City of Cusco provided extraordinary access to the places chosen for scanning, allowing the project team to use the streets at the three in-town sites for long periods of time. The manager of the Saqsaywaman Archaeological Park opened the site at sunrise, long before tourists would arrive, so that Jon and his assistants could collected 3D data, and other members of the project team could film interviews with scholars consulting on the project. And the owner of the modern hotel that uses the Inka double-jamb door as an entranceway graciously let the Smithsonian include that site in the project. 

Back at the Smithsonian, Jon used software to layer the information he had captured in the field and build each 3D model. He began by creating a point cloud. Vince Rossi, a program officer on the 3D staff, describes the data behind the point cloud as essentially a text file with XYZ values for each data point. This durable information will remain useful even as the museum community establishes new standards for archiving data and as software developers write new algorithms to make sense of it. 

The next refinement was to create a black-and-white 3D surface model for each site from its point cloud; laser scanning and photogrammetry geometry data was combined to produce high-resolution geometry using the strengths of each capture method. Next the photogrammetry data was used to projected color onto the geometry. The result is geometrically detailed, accurately colored models. In Cusco, Jon recorded perhaps 40 to 100 gigabytes of raw data for each site. Before posting the models on Smithsonian X 3D, he used techniques developed for digital animators to compress the data and create 3D models that maintain visual fidelity, yet can be downloaded quickly even on mobile devices. 

“That’s what our office does,” Vince explains. “We’re not inventing new technology. We’re leveraging tools that were developed for other industries and developing workflows—the nitty-gritty process of collecting the data and putting together the tool chain that gives us the products the Smithsonian needs. We’re using existing tools in new ways.” 

The Smithsonian X 3D staff compares 3D on the web today to video a handful of years ago. Museums have long had the technology to scan objects in three dimensions at very high resolution. But the ability to deliver 3D content directly to people online, without requiring viewers to download browser plug-ins, is a recent development. People can also download 3D data from the Smithsonian X 3D website, then visualize it in their own software or use it for their own scientific or creative projects, under the Smithsonian terms of use. “That’s more of an experiment,” Vince says. “We’ve already seen people do exciting things—teachers in the classroom creating 3D prints. More and more public libraries have 3D printers.” 

3D-printed Hatunrumiyoc puzzles aside (yes, Jon, Vince, and the third member of the 3D staff, Adam Metallo, have made them), what does 3D imaging bring to Smithsonian research? It provides scientists with new tools to document fieldwork and gives conservators a fast, accurate way to record and compare the condition of objects in the collections. It also enables researchers, and the rest of us, to do things that are impossible to do with actual museum objects. 

To get a glimpse of what that can mean, we have to leave Cusco and look at the 3D model of the Cosmological Buddha. Keith Wilson, a curator at the Freer and Sackler Galleries, the Smithsonian’s museum of Asian art, explains in one of the tours that accompany the model, what distinguished this sculpture are the narrative scenes that completely cover the monk’s robe. On the Smithsonian X 3D site, we can turn the sculpture around to have a 360-degree view or look at a flat map of the carvings, but that’s just the start. 

“Nothing replaces the experience of seeing the sculpture in the gallery at the Freer–Sackler,” Vince says. “But if we go under the hood and turn off the color, that does interesting things, because the color of the stone was interfering with seeing the geometry of the surface. We can further bring out the geometric detail using an ambient occlusion map, which essentially darkens areas of high curvature and lighten areas of low curvature. We can adjust detail live in the browser. All of a sudden we’re better able to get a much better idea of the carving. This is still an accurate representation of the sculpture. It’s just a different way to visualize what’s really there.” 

Cosmic Buddha

This poster, which is available in large format (500 MB file) via the SI X 3D Download webpage (free and open to the public with registration), shows the components of the digital model of the Cosmological Buddha. From left to right: Photo texture, composite occlusion (note how the surface carvings stand out), geometry, normal map, and individual occlusion channels. A print-ready model of the sculpture in low, medium, and high resolution is downloadable from the same site.


“If we back up and look at 3D technology, it’s really nothing more than a form of measurement. We’ve been able to measure things for thousands of years. If we look at the way research at museums is generally conducted, it has included very accurate point-to-point measurement of landmark points on an object or specimen. With a 3D scan, we’re able to replace those few dozen measurements with tens of millions of data points. We’re able to provide whole new tools to researchers and open up a whole new world of investigation. By putting these models online, we’re also opening that world to the public.”


The Great Inka Road: Engineering an Empire is on view at the National Museum of the American Indian in Washington, D.C., through June 1, 2018.

The SI X 3D website includes more information on digitization projects at the Smithsonian, including a gallery of videos that highlight other 3D projects at the Smithsonian and explain the digitization process in detail. 

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July 15, 2015

The Great Inka Road: Engaging visitors in the Inka creation story

One of the best examples of collaboration and synergy across a project I’ve been part of is the “Origin Story of the Inka,” an interactive book produced for the exhibition The Great Inka Road : Engineering an Empire. This simple touch-screen experience allows visitors to page through a digital book and see and hear the Inka creation story brought to life through brilliant images, with audio for every page in English or Spanish. People can read it online by scrolling down in the Ancestors section of the Inka Road website, and a printed version is for sale in the museum shop.

8 capas.eng

According to the Inka myth of origin, Inti, the sun, sent two of his children—Manco Capac and Mama Ocllo—to bring order and civilization to humankind. The pair emerged from Lake Titicaca and headed north to found a city. The city was Cusco. Their path was the first Inka Road.

8 capas
Sample screens, in English and Spanish, from "The Inka Creation Story." Design by Juanita Wrenn/WrennWorks, illustrations by Alejandra Egaña and Paz Puga, Ojitos Producciones.

The museum’s production team worked together to shorten the story into a form that would work well for visitors in the gallery. Illustrations by Alejandra Egaña and Paz Puga—partners in Ojitos Producciones, based in Chile—bring the story to life. Using reference visuals of museum objects and other Inka material culture, they produced images based on Inka iconography and colors. Their delightful compositions fit within the scholarly context of the exhibition and, we hope, will excite the imagination of younger visitors. These illustrations so inspired the exhibition team that we reached out to Alejandra and Paz to create drawings used to visualize aspects of Inka engineering elsewhere in the exhibition.

Juanita Wrenn of WrennWorks designed and programmed a simple, intuitive interactive experience accessible to even early readers. Juanita, who is based in North Carolina, surprised the team by offering to bring an early prototype to the museum, to make sure that what she was producing would work on the gallery touch-screen monitors. Her visit reflects her passion and her dedication to getting all the details right.

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The interactive book's narrator and her proud mother.

For bilingual audio and sound design we relied on the expertise of the museum’s staff. Veronica Quiguango (Quechua), a collections specialist at the museum’s Cultural Resources Center, offered the talents of her six-year-old daughter. We set up a recording session engineered by NMAI Media Group senior producer Gussie Lehman, and our narrator amazed us by enthusiastically recording the stroy, in English and Spanish, in a single session. She has so much energy we had to take a couple breaks to let her get up and run around the studio a little bit. We felt lucky to capture a wonderfully unique performance that shows off this young person’s fantastic personality. We may eventually add narration in Quechua, since her mother is fluent and she is working on that language as well!

With a wonderful narration in hand, we turned to NMAI Media group producer Mark Christal to add a bit of ambience and sound design. Mark recorded sounds of water, footsteps on a gravel road, and electronic effects combined with music from NMAI Cultural interpreter José Montaño (Qulla [Aymara]) to provide audio details to match the colorful illustrations and the power of the myth.

This project has surpassed our expectations with brilliant contributions from international artists, technicians, staff, and certainly the youngest narrator we have ever worked with. We know that it is an important part of the Inka Road exhibition, helping visitors of all ages access the story of the origin of the Inka Empire and understand the importance of the city of Cusco. Collaborative projects like these are especially exciting, since each contribution complements the others and we end up with something that no single person here could have imagined.

—Dan Davis 

Dan Davis is the manager of the NMAI Media Group.

The Great Inka Road: Engineering an Empire is on view at the National Museum of the American Indian in Washington, D.C., through June 1, 2018.

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I paged through this interactive in both languages several times. I couldn't get enough! I grew up with this legend. Every elementary school student in Peru must learn it. The narration and sound effects were utterly captivating. I just wanted to find your narrator and give her a big hug! The illustrations are simply beautiful, and so appealing! I feel a coloring book coming. You really captured, in a most charmed way, this well loved origin story and have made it even more accessible for generations to come. Buen trabajo!

Amazing post.Very informative...Thanks for sharing.

hi , i read this articles The illustrations are simply beautiful, and so appealing , especially the interactive book you produced for the exhibition its amazing ..

June 24, 2015

Live symposium webcast June 25 & 26—The Great Inka Road: Engineering an Empire

Chinchaysuyu-suspension-bridge-peru
Q’eswachaka suspension bridge, Apurímac River, Canas Province, Cusco, Peru, 2014. Photo by Doug McMains, NMAI 

On June 25 and 26, the National Museum of the American Indian will present a live webcast of the symposium The Great Inka Road: Engineering an Empire. The symposium celebrates the exhibition of the same title, opening at the museum in Washington, D.C., on Friday, June 26.

The Great Inka Road, a sacred network of roads 40,000 kilometers (nearly 25,000 miles) long, connected a confederation of more than 100 Native nations in six modern countries—Argentina, Bolivia, Chile, Colombia, Ecuador, and Peru—and linked them to Cusco, the imperial capital. In 2014, UNESCO recognized this monumental achievement by including the Inka Road on the World Heritage list.

During the symposium, engineers, archaeologists, and other experts and scholars will discuss the political, economic, and religious ideas that enabled the Inka to consolidate power, and the communications, transportation, and agricultural infrastructure that made it possible for them to administer a vast and diverse empire.

The symposium and live webcast will be presented Thursday, June 25, from 1:30 to 5:30 pm, and Friday, June 26, from 9 am to 5:30 pm. Friday's program will feature Spanish-speaking scholars; live webcasts will be offered in Spanish and with simultaneous translation into English.

The webcasts will be archived on the museum's YouTube channel a bit later in the summer.

Symposium program

NMAI live webcasts

#InkaRoad

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June 22, 2015

On the Inka Road: Conserving an Incensario

This ceramic (NMAI 20/6313) is one of approximately 150 objects within the exhibition The Great Inka Road: Engineering an Empire, opening at the National Museum of the American Indian in Washington on Friday, June 26. This object, called an incensario, is from the Tiwanaku culture in the Katari Valley of Bolivia and dates to AD 600 to 900. 

Incensarios are incense burners or lamps, often associated with mortuary practices. Tiwanaku incensarios are characterized by their hyperboloid shape; scalloped rim; zoomorphic head and tail depicting a feline, condor, or llama; and elaborate design motifs, which portray geometric designs, feline faces, condors, and other beings of symbolic significance. 

Incensario 1 Incensario 2

Left to right: Tiwanaku incensario (incense burner, NMAI 20/6313), recto (front) and verso (back) before treatment. 


This incensario with feline head and tail and feline and condor design motifs was poorly reconstructed at some point before entering the collection of the Museum of the American Indian, now Smithsonian's National Museum of the American Indian. Sherds were misaligned, detracting from the ceramic’s beauty and detail. 

Incensario 3
Conservator (and blog-writer) Beth Holford cleaning the surface of the incensario with a soft brush.

In discussions with curator Ann McMullen and staff conservator Emily Kaplan, we decided that taking the ceramic apart and reconstructing it would enable the museum to present the incensario's original aesthetics without distraction. We anticipated that this process would take many hours in the Conservation Lab. Fortunately, I was able to start several months before the Conservation team began work on the rest of the objects for the Inka Road exhibition. 

Initial treatment included a surface cleaning and removal of old paint and fill material so that the adhesive holding the sherds together would be more accessible. Examination under ultraviolet light revealed an orange and white fluorescence, suggesting that at least one of the adhesives was likely shellac. Shellac can cause problems for conservators because it becomes less reversible as it ages. This was the case with this vessel, and it was necessary to use a mix of solvents as well as a paint stripper to soften the adhesive enough to deconstruct the ceramic. 

Incensario 4 Incensario 5Right to left: The left side of the incensario in visible light, then in ultraviolet light; the orange and white fluorescence was a clue that shellac might have been used to make earlier repairs. 

Once the ceramic was in pieces, I could remove the remaining adhesive residue mechanically— using a scalpel and working under magnification—so that the edges of the sherds were exposed and a more precise reconstruction could be accomplished. 

Incensario 6The object in pieces: all the adhesive has been removed from the ceramic.

Incensario 7

The vessel was reconstructed with a more conservation-appropriate adhesive—one that is chemically stable and readily reversible. Areas of loss were filled with a stable acrylic spackle. Select locations were painted with reversible acrylic paints in order to provide visitors to the exhibition with a more complete and aesthetically continuous appearance. 

These areas include locations where the original ceramic was missing, as well as locations where the slip design had been lost. Discussions with Ann McMullen helped identify areas of design that could be safely interpreted from similar designs on this vessel as well as others in this and other collections. Our goal was to preserve the incensario's cultural, historic, and aesthetic integrity, but we wouldn't mind if visitors were also thrilled by how wonderful it looks.

Incensario 8

Incensario 9
Incensario stages Tiwanaku-jaguar

Top right: Beth reconstructing the ceramic. 2nd row, left to right: The incensario before and after loss compensation and inpainting. 3rd row, left to right: The incensario before, during, and after treatment. Bottom row: The incensario as it appears in the companion book to the exhibition: Ceremonial incense burner in the form of a puma, AD 600–900. Tiwanaku, Bolivia. Ceramic, paint. 26 × 34.5 × 21.7 cm. Photo by Ernest Amoroso, NMAI. (20/6313)

—Beth Holford

Beth Holford is an independent conservator with Holford Objects Conservation, LLC.

Unless otherwise credited, all photographs are courtesy of NMAI Conservation.

The Great Inka Road: Engineering an Empire will be on view at the National Museum of the American Indian in Washington, D.C., from June 26, 2015, to June 1, 2018.

 #InkaRoad

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June 18, 2015

On the Great Inka Road: Conserving an Arybalo

Arybalo 1GuamanPomaJune


Left:
Inka arybalo (ceramic vessel, NMAI 14/5679) awaiting conservation. Right: Illustration of Hawkay Kuski, the rest from harvest, showing an Inka woman pouring a'qa (maize beer) from an arybalo into qeros (cups). Pen and ink drawing by Felipe Guaman Poma de Ayala (Quechua, ca. 1535–1616). From El primer nueva corónica y buen gobierno (The First New Chronicle and Good Government, 
1615). Royal Library, Copenhagen GKS 2232 4º.

 

During the last few years, conservators have been busy working on the objects that will be on view in the exhibition The Great Inka Road: Engineering an Empire, opening Friday, June 26, at the National Museum of the American Indian in Washington, D.C. Objects illustrated in the book that accompanies the exhibition—including this arybalo, or ceramic vessel—had to be conserved early so that they would look their best for museum photographer Ernest Amoroso. 

Arybalos, distinctive vessels found in every part of the Inka Empire, were typically used for holding maize beer—chicha in Spanish, or a'qa in Quechua, a language older than the Inka and still widely spoken in the Andes. At 112.5 cm tall, this particular arybalo (NMAI 14/5679) is one of the largest known in the world and would have helped people celebrate in a big way. Note the pointed base and flared neck, characteristics of all arybalos that made pouring from them easier. The handles were made to be strung with rope for easier carrying.  

In addition to the characteristics that made arybalos such great containers, this one had an unexpected feature: a round hole in the vessel's back. My colleagues in Conservation and I were perplexed until we took a closer look at the arybalo's cracks, which were visible as dark lines around the hole and through the designs on the front. 

Arybalo 2 Arybalo 3
Left: The back of the arybalo and the puzzling hole. Right: A crack running across the side of the arybalo and through the designs on the front. 

By studying the cracks, we realized that at an unknown date the vessel broke and was put back together using shellac and metal wire. This was a typical repair practice for antiquities collectors and restorers during the late 19th and early 20th centuries. Holes were drilled on the edges of broken pieces, then metal wire was inserted through the front and twisted in the interior, putting the pieces back together in a manner similar to stapling. The previous restorer filled in the cracks and the wired areas using plaster, then painted the repairs to match the surrounding ceramic. Over time, the color in the restored areas darkened and became distracting.

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Arybalo conservation 5

Left: One of the wire repairs. Right: An earlier plaster restoration: the blue arrow points to painted plaster that darkened over time; the red arrow, to a wire mend and damaged ceramic exposed after the plaster repair was removed.


This arybalo, however, is too large for anyone to reach the repairs via the neck and twist the metal wires tight, so restorers cut an access hole into the back of the arybalo. The hole, therefore, was not part of the original function of the object. The metal-wire repair technique is no longer used by conservators because it damages original surface, and there are adhesives available today that are strong enough to hold ceramics. 

During this restoration, conservators removed the plaster repairs using cotton swabs dampened with water. Conservator Beth Holford and I then applied a conservation-grade acrylic spackle fill to the cracks and over the exposed metal wires. After making sure the fills were even with surrounding ceramic, we painted them to blend in with the original designs. 

Arybalo  6

Arybalo 7 Arybalo 8

Top: Conservator (and blog-writer) Fran Ritchie and conservation colleague Beth Holford working on the arybalo. Above: A new repair made with conservation-grade acrylic spackle, before and after it has been painted to blend in with the original pattern. 

Total time spent treating the arybalo to this point? More than 50 hours. Come see the conserved arybalo in The Great Inka Road, on view at the National Museum of the American Indian in Washington, D.C., from June 26, 2015, to June 1, 2018!

Team arybalo NMAI 145679
Top, from left to right:
 Conservator Emily Kaplan, Collections specialist Veronica Quiguango, mountmaker Shelly Uhlir, Fran Ritchie, and Collections specialist Tony Williams prepare to transport the arybalo, now ready for its close-up, to the museum's photo studio. Above: Inka arybalo, AD 1450–1532. Peru. Ceramic, paint. Photo by Ernest Amoroso, NMAI. (14/5679) 

—Fran Ritchie

Fran Ritchie worked on The Great Inka Road as an Andrew W. Mellon Fellow in conservation at the National Museum of the American Indian. She is currently a conservator at the American Museum of Natural History in New York.

Unless otherwise credited, all photos are courtesy of NMAI Conservation.

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