Categories
3D

On Sketchfab and Cultural Heritage

Sketchfab screenshot

When I first started out with learning 3D visualisation techniques and software back in 2001 I longed for a way to share my models online. In the early days there was VRML and other, proprietary, methods (Superscape, Shockwave 3D, etc) but these required either big browser plugins with limited capabilities or in the case of VRML, very low polygon (simple) models. My 100,000 polygon reconstruction of the Tudor palace at Oatlands which I built from archaeological and contemporary visual evidence was never going to make it online back then.

Without providing a history of the technology used to present 3D models online – I’ve probably tried most methods through the years – we now have a splendid service called Sketchfab. I’m certain that someone has used the YouTube analogy here. Putting video online used to be hard until YouTube and the many similar services that came and went. Now you can open a Sketchfab account, upload your models, edit how you’d like them to initially appear, and share your links or embed them in your website or social media timeline. There are many sophisticated tools to change how your model appears, from its textures, to the environment and lighting, background photo, visual effects, and interactive annotations.

In the world of cultural heritage Sketchfab opens up a whole range of possibilities. Annotations allow numbered points to be attached to geometry and through the use of Markdown, those annotations can include embedded photos and hyperlinks.

Here we see a model of Hoa Hakananai’a from the British Museum’s Sketchfab account (3D capture by my colleagues at Archaeovision) with annotations to explain some of the carvings on the statue.

I’m currently working on an interactive plan of a shipwreck where annotations contain links and are used as the launch to pages with further information. It’s a really nice way to explore it without, or indeed before, any diving.

Sketchfab also contains a really good user community, including a dedicated cultural heritage group.

There’s always room for improvement. I’d love to see a point-to-point measuring tool, and I hope that the download facility one day allows for charging for models – that way people who can’t afford to give away their content can perhaps earn a bit of income, which could be good for freelancers and for Sketchfab via a commission model.

Other than that, Sketchfab is pretty amazing. Go and sign up – it’s free.

Here’s a lovely statue-menhir from the island of St Martins on the Isles of Scilly that I scanned in 2015. Sketchfab’s now ubiquity allows models to be embedded within WordPress by just pasting the link into a new line in the editor. Very handy.

 

Categories
Archaeology

Animal Headed Saints

Discovery News Homepage 9 December 2015
Discovery News Homepage 9 December 2015

Today sees the release of the January/February 2016 edition of British Archaeology. It features an article by Prof Michelle Brown and I on the early medieval cross-base at Gulval Church and its unusual depictions of the Four Evangelists.

Whilst my copy of the magazine has yet to be delivered the story has been picked up by Discovery News in a piece entitled “Medieval Monument Depicts Animal-Headed Saints“. Use the arrow buttons or square page buttons to navigate through the story.

Findings also suggest that people from the U.K. at this time were traveling to the Middle East, and vice versa, negating a prior belief that contact between this region and the U.K. was interrupted from about the end of the Roman Empire in the West in 476 A.D. to the start of the Medieval Crusades in 1095 A.D.

Subscribe to British Archaeology and find out about the latest issue.

Read about my initial discovery in my post “A Medieval Discovery at Gulval Church, Cornwall“. The British Archaeology and Discovery stories cover subsequent research with Michelle.

Categories
Digitisation

Announcing cornishmemory.com – a new resource for Cornwall’s audio-visual heritage

cornishmemory.com logoSince November 2014 some of my time has been spent working with Azook CIC,  a “not-for-profit social enterprise dedicated to growing cultural confidence amongst Cornish communities by connecting people with their cultural heritage”. Initially working on the MemoryFish project looking at fishing heritage in Cornwall, I began to help them rebuild cornishmemory.com so that it would have capacity to display tens of thousands of historic photos, films and audio recordings from around Cornwall. Many of these items have been digitised from private and pubic collections with the support of the Heritage Lottery Fund as part of Azook’s Re:collect project.

The new version of cornishmemory.com is built using an open source platform called Omeka, which is designed for “scholars, museums, libraries, archives, and enthusiasts”.  I customised it for their needs and populated it with over 31,000 items, assisted by many open source tools along the way, such as LibreOffice and OpenRefine.

There are lots of improvements and additional functionality planned for 2016 (Creative Commons licensing, metadata enhancement, temporal searching, Google site search, more content, etc).

Visit cornishmemory.com if you are interested in any aspect of the the history of Cornwall.

Categories
Archaeology

Neolithic Breton-Style Rock Art at Boscawen-ûn Stone Circle

Plate 77 from Péquart & Le Rouzic 1927, showing the twin feet motif on stone 8 at Dolmen du Petit-Mont.
Plate 77 from Péquart & Le Rouzic 1927, showing the twin feet motif on stone 8 at Dolmen du Petit-Mont.

Today members of the Cornwall Archaeological Society will have received copies of the latest newsletter. I didn’t expect to be featured on the front page!

Below is the text from the newsletter which I wrote after an intensive couple of days research in the Society of Antiquaries library. I have many more thoughts and notes on the matter and will write a follow-up post.

A Reinterpretation of the Rock Art at Boscawen-ûn Stone Circle

In 1986 Ian Cooke first recorded, on the north-east side of the central stone at Boscawen-ûn stone circle, the presence of a pair of carvings interpreted as representations of neolithic stone axes. This remarkable discovery is relatively obscure and beyond the initial plans to record their location, and beyond Peter Herring’s excellent report in 2000, little research has been undertaken.

In early July 2015 the author was kindly taken to Boscawen-ûn by Adrian Rodda and shown the carvings. During this visit the central stone was recorded using photogrammetry, a technique which uses photographs to create a highly detailed 3D surface model.

Close analysis of the resulting 3D model of the central stone revealed the carvings clearly. The model was straightened so that they could be inspected more closely. Surface colour was removed and digital techniques were employed to accentuate any surface features. The results were surprising.

Depth image of the NE (inner leaning face) of the central stone.
Depth image of the NE (inner leaning face) of the central stone.

The carvings appear to represent not two stone axes but a pair of feet, soles outwards, carved in low relief. A row of ‘toes’ can be discerned, especially on the right-hand foot.

Accessibility shaded image of the carvings.
Accessibility shaded image of the carvings.

They bear a striking resemblance, albiet weathered and on coarse Lands End granite, to those recorded at Dolmen du Petit-Mont at Arzon in Brittany. Barbara Bender noted in 1986 that the stone bearing the feet motif had disappeared. Presumably it was removed or destroyed in WWII. However the author has discovered a photograph in Péquart & Le Rouzic’s 1927 Corpus des Signes Gravés des Monuments Mégalithiques du Morbihan, which is reproduced here. The feet are quite similar in appearance, albeit slightly smaller at 230mm (ours are about 450mm long).

Plate 77 from Péquart & Le Rouzic 1927, showing the twin feet motif on stone 8 at Dolmen du Petit-Mont.
Plate 77 from Péquart & Le Rouzic 1927, showing the twin feet motif on stone 8 at Dolmen du Petit-Mont.

This is not the only surprise at Boscawen-ûn. The data has revealed about 500mm above the feet a pair of circular features, also in low relief, which appear very similar to carvings interpreted as breasts on some allée-couvertes in Brittany (Tressé, Prajou-Menhir, etc).

Along with the presence of the possible cromlêh noted by Dr Borlase, perhaps we could consider that the stone circle was, for reasons unknown, constructed with reused stone from a much larger chambered tomb which incorporated decorated stones in the Breton style. Those symbols may have had potent significance, enough to position them in the centre of a new monument. Reuse of decorated and standing stones is known in Brittany (see Scarre 2011, p147). Many of the inner faces of the stones at Boscawen-ûn are flat – perhaps once lining a small passage or chamber.

More research is in progress and a more detailed article is in preparation.

References

Barbara Bender with Robert Caillaud. The Archaeology of Brittany, Normandy and the Channel Islands: An introduction and Guide. London: Faber and Faber, 1986.

Peter Herring. Boscawen, St Buryan, Cornwall: archaeological assessment. Truro: Cornwall County Council, 2000.

Martha et Saint-Just Péquart & Zacharie Le Rouzic. Corpus des Signes Gravés des Monuments Mégalithiques du Morbihan. Paris A. Picard & Berger-Levrault, 1927.

Chris Scarre. Landscapes of Neolithic Brittany. OUP. 2011.

Categories
Archaeology

A busy summer

Mermaid of Zennor medieval bench end
The medieval mermaid bench-end at the church of St Senara, Zennor, Cornwall.

I haven’t blogged since March, and since I have some data processing in the background and can do little else while I wait, I thought I’d post a little update.

I have been working for most of the week with Azook, rebuilding cornishmemory.com, the web front-end to their Re:collect digital archive of historic photographs, films and audio from across Cornwall. The updated site will launch in a few weeks with much larger images, better search, an API, and lots of great features. I have also been continuing to work on the MemoryFish project digitising historic photographs if Cornwall’s fishing industry. If that isn’t enough, I have helped Azook to tweak some of their workflows and effect some useful changes internally. I’m really enjoying being in at the deep end of digitisation and hope to continue to work with them on future projects.

When not working with Azook, I’m continuing to work with the Morrab Library. Having designed their digitisation facilities, which I believe are among the best in Cornwall, implemented their database and workflows, I’m also using the system myself to digitise some wonderful 19th century lantern slides. The Morrab Library have applied for some funding to allow us to digitise a unique collection of over a thousand glass plate negatives of archaeological subjects and Cornish cultural events such as the first Gorsedd in 1928. If it works out, these will all be made available online.

Heading back to more ‘direct’ archaeology, I have been busy here too. In the middle of July I visited Professor Charles Thomas FSA with Jacky Nowakowski FSA where we had a chance to visit the church of St Clement near Truro. We recorded the medieval cross in the churchyard using photogrammetry to further investigate the inscriptions. Interpretation is ongoing.

I have also been up to London to use the Society of Antiquaries library to research in interesting find I have made at a stone circle here in west Cornwall. More on that when I have finished the research, but it’s quite an exciting find.

As I type, I am processing both photogrammetry and Reflectance Transformation Imagine (RTI) data for a privately commissioned analysis of a stone thought to contain fine carvings. I am not convinced, but it important to assess the stone carefully. At 50mm x 40mm I have 13 million measurement points and a very nice mesh.

I have also undertaken a commission for the National Maritime Museum Cornwall (our largest and busiest museum) to 3D capture the famous medieval mermaid bench-end at the church of St Senara in Zennor. This was a tricky task because of low light levels, high specularity from the church windows on its highly polished wood surface, and many eager visitors. Despite the challenges, the results are fantastic. I provided the model in a format ready for 3D printing, which will be reproduced half size full colour out of solid resin for a forthcoming exhibition.

I’m also preparing an article for publication with Professor Michelle Brown FSA on the Gulval Evangelists to explore the significance of the find more fully.

And then there’s the Tywardreath Priory project, where we hope to launch a public archaeology project to locate and fully investigate a Benedictine priory in the village. I helped out with the open day during the Festival of Archaeology 2015, explaining 3D technologies, LiDAR, and the wider landscape archaeology.

Busy times!

Categories
3D Archaeology

Interactive 3D Models on Sketchfab

Publishing 3D models online used to be a pain. It always relied upon plugins, and the results could never be very detailed. Sketchfab has changed all of that, and made publishing beautifully detailed 3D models a breeze. You could use the analogy that Sketchfab is a kind of YouTube for 3D models. It is also a social network in that favourites, comments and forum discussions are all part of the system.

Whenever I can I will be publishing my models on Sketchfab, and when it’s not work in progress or for a client, I intend to enable downloads under a Creative Commons (CC BY 4.0) license.

Here’s a taster of Penzance Market Cross with a detail enhancement filter applied to it (think inverted chalk rubbing). You may need a fast broadband connection and fairly recent computer to have a smooth viewing experience of this model.

[sketchfab id=”6760debf8f17424c8f20579b910f4c2e” start=”0″ spin=”” controls=”1″]

 

Categories
Archaeology

Recording St Piran’s Oratory – 3D model and animation

I have now completed my recent work on St Piran’s Oratory on behalf of St Piran Trust and Cornwall Archaeological Unit. It was a challenging task requiring a huge amount of computer resources and time, with colleagues at Archaeovision helping when my computer broke down, but I am pleased with the results.

Here is a short animation of St Piran’s Oratory, digitally freed from its concrete walls:

Here is an interactive model which you can zoom, turn, and inspect:

[sketchfab id=”f2f60441723f433cb230153768cf5f77″ start=”0″ spin=”” controls=”1″]

And here is an interactive 3D model of the complete Oratory structure with the concrete walls we see today:

[sketchfab id=”b360da3fe0ca4deda9d6d8b03e2cb4cf” start=”0″ spin=”” controls=”1″]

We must now wait for the final report by CAU (to which this data contributes) to better understand the building and its phasing. Watch this space.

Categories
Archaeology

Medieval Chapel Killed My Laptop

St Piran's Oratory rendering

Since November I have been working on 3D capture data from St Piran’s Oratory. It has taken a long time to process the 3D photogrammetry data as it is a hugely complex task to record every stone. This process caused the untimely demise of my 5 year old MacBook Pro, which was struggling anyway. It’s 8GB RAM just couldn’t cope, with the sheer quantities of data, and then the screen began to flash purple, before randomly restarting. Or just turning off. Recording the remains of this old building finished it off. Hence the tabloid-esque title of this blog post…

Happily, colleagues at Archaeovision stepped in to help (thanks James), and I have been able to deliver the (300 million points) raw data to the client, along with a textured mesh of the Oratory and surrounding Scheduled concrete, and a series of orthographic renders of each elevation.

I have since been able to purchase a new computer – an iMac Retina 5K with i7 4Ghz, 32GB RAM, SSD, and upgraded graphics. The screen is gorgeous – so crisp – it makes going back to using a ‘normal’ screen quite difficult. It’s the perfect balance for me in terms of display quality and performance.

The header image of this post shows the last stage of this project. I am rendering a short animation of the chapel  structure to help people visualise it without its concrete shelter.

Since the concrete walls surrounding St Piran’s Oratory do not allow enough clearance for conventional photography, this has proven to be a very useful exercise to record and understand the structure that we see today – a confection of medieval to 20th century rebuilding and repair.

When the animation is available publicly, I will post a link here. I also hope to upload a model of the unencumbered  Oratory to Sketchfab so that it can be inspected at will. I will post that on this site in a new blog post when it is ready.

 

Categories
Archaeology

It’s All About The Photos

It’s been a busy time for me recently, with much of my recent work focussing upon historic photographs and photogrammetry.

I have been working with the Morrab Library in Penzance to build a digitisation facility so that they may begin, with a volunteer workforce, to scan their wonderful collection of historic photographs. There are about 12,000 photos in the collection, ranging from 19th century glass plate negatives, to recent prints covering the whole of Cornwall. I have collated their Microsoft Works databases (one for each collection) into a single database, undertaken a data cleaning exercise, and mapped fields into Dublin Core metadata element set. The entire database was then imported into Omeka which is running on a local web server. I have tweaked Omeka and the environment in which it runs so that large TIFF files (up to 1GB) can be uploaded, with JPEG derivatives being created, the original TIFF being stored on a different server (separate from Omeka, with dual redundant disks and external backup) with the original filename (the photo’s accession number) being preserved. You can’t be too careful.

Whilst it isn’t designed out of the box to be a cataloguing tool, Omeka is doing exactly what we need. The user interface is well-designed and sufficiently easy for some elderly people to grasp quickly. The customisation to store unaltered original scans on an abstraction layer works well. Automatic database backups are also placed on the same server.

I have also begun working for an organisation called Azook, where I am the Project Officer for a project called MemoryFish. It will collect unpublished historic photos, films and recordings from private collections, documenting the history of the fishing industry in Cornwall. The initial areas are Falmouth, Newlyn and Newquay, and photos will be published on cornishmemory.com.

Then there’s the digital archaeology. I have been working for Cornwall Archaeological Unit and St Piran Trust on the recording of the now fully excavated St Piran’s Oratory. With the help of colleagues at Archaeovision we have processed a point cloud consisting of nearly 300 million points. This project is ongoing, but here is a taster of the work in progress.

[iframe width=100% src=”https://sketchfab.com/models/b360da3fe0ca4deda9d6d8b03e2cb4cf/embed” frameborder=”0″ allowfullscreen mozallowfullscreen=”true” webkitallowfullscreen=”true” onmousewheel=””]

And in other news, in December 2014 I walked into a hairdressers and came out with short hair. It’s the shortest I’ve worn it since I was 17. Here’s the evidence.

Tom with short hair
Tom with short hair

And I’ve retired my famous trademark brown velvet jacket, replacing it with…. an almost identical copy. Some things should never change!

Categories
Life

Penzance’s Midwinter Customs – Montol 2014

Plans for the 2014 Montol celebrations here in Penzance are well underway. This year it is being run by the Cornish Culture Association who have organised a fantastic and packed programme of events on Sunday 21st December.

Dancing at the beacon, Montol 2012

The concept of an organised community celebration on one day called Montol is a modern one. However, many of the individual elements held on the day are much more ancient ones, practised in Penzance and across West Penwith during the height of winter. Guise Dancing, the Chalking of the Mock, fire and beacons, and the revels of the Corn-Market are all well documented midwinter traditions.

Today’s Montol has become a tradition in its own right – an event that many in Penzance look forward to and expect to happen. In the times when our part of the world is at its darkest comes a time when fire, costume, music, colour, dancing, stories, and a little revelry lift the dark blanket of winter a little.

Of course, traditions don’t always have to stand still. Last year’s experimental revival of the Corn-Market is a form of guise dancing formed as a series of games and parade between the town’s pubs recorded by William Sandys in the early 19th century. It is now known as the Corn Market Revels and has proven to be so successful that this year it has inspired a series of ‘guilds’ who are attaching themselves to other iconic buildings in Penzance. Look out for the Egyptians emerging from the Egyptian House on Chapel Street, and the Turks from the Turk’s Head pub (Penzance’s oldest pub) during the course of the evening.

Something that I have learned this past year is that guise dancing is a fascinating tradition. Archaically referred to as “goosey dancing”, it is not, in the strictest sense, necessarily always a dance, but a form of performance that can take many forms. Traditional costume can be rather sinister in its appearance. If you are interested, do have a look at Simon Reed’s Guise Guide to find out more.