The Bronze Oak Project

Queen's Oak
Bronze Cast
H. 170 X W. 105 X 110 CM
BASE: 100 X 100 X 100 CM.

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Queen Elizabeth II and Adam Lowe, Director of Factum Arte. Her Majesty presented with the miniature version of the Signing Oak Tree at the Royal Academy of Arts, October 2016

The final miniature bronze oak tree on its plinth at the Royal Academy of Arts, London.

The final, miniature bronze replica of the Signing Oak Tree at Windsor Great Park

 

Ancient trees are part of our landscape, our art and our history. As remnants of the ancient wild woods, the oak tree inspires a sense of awe and mystery and is an enduring symbol of British identity. Britain has the largest number of ancient oaks in northern Europe. Most of them are found in its Medieval royal forests, such as Windsor Great Park and Sherwood Forest, where Kings and Queens have been custodians for over a thousand years: these are some of the largest and most astonishing living things that can be seen in the UK.

These thousand-year-old oaks represent a biological continuity dating back perhaps only seven generations to the last ice age. They are not only of historic interest but are also a valuable part of our cultural heritage (Ted Green, conservation consultant at Windsor Great Park and a founding member of the Ancient Tree Forum).

 

Recording & post-processing

On the 11th-16th April 2016, Pedro Miró, Manuel Franquelo, Ferdinand Saumarez Smith and Adam Lowe from Factum Arte/Foundation visited the site at Windsor Great Park and conducted photogrammetric recording of the 900 year old Signing Oak Tree.

Two Canon 5DSR cameras with two different lenses (a Canon 100-400 mm. & a Sigma 50 mm) were employed to photograph the whole tree. Each image was captured with a 90 degree overlap, in preparation for these to be stitched together using specific photogrammetry software.

Most of the tree trunk was recorded from the ground, and a cherry-picker was employed to record the branches from higher angles. Leaves and acorns were cast directly from life.

Adam Lowe, Pedro Miró and Manuel Franquelo carrying out photogrammetric recording

Recording the tree from a distance - two flashes were employed to even out the ambient light

The branches were recorded from the ground using two different lenses: a Canon 100-400 mm and a sigma 50 mm

Test scans with the Breuckmann 3D White Light scanner were also carried out by Factum´s Pedro Miró - however, the scanner was soon deployed for a combination of different factors which made it impossible to scan the tree at the desired resolution.

Tests were conducted with the Breuckmann White Light Scanner but the ambient light and the tree´s texture made it impossible to record the entire tree using only this method

Over 5000 50mb images were taken in total. The data gathered during recording was then stitched together using highly specialised software to create an accurate, digital 3D model using Capturing Reality´s RealityCapture software.

Post-processing the data

Post-processing the data creating a 3D model

The rematerialisation process

The miniature replica was made using a combination of digital and artisanal techniques.
3D Stereo Lithography (SLA), a form of 3D printing with Epoxy resin, was used to materialise the digital 3D model of the tree. The tree trunk´s 3D print was subsequently moulded in silicon and then cast in bronze using the lost wax technique in a centrifugal casting system at the Esfinge Foundry in Madrid, to replicate every possible detail.

External view of the miniature tree cast in wax

Runners on the interior of the wax cast

Parts of the mould employed for bronze casting using the lost wax technique

Adam Lowe & Sebastian Beyro observing the work in progress at the Esfinge Foundry in Madrid

Bronze oak tree - work in progress (details)

 

Comparing the original 3D print with the cast bronze miniature replica of the Signing Oak Tree

 

In October 2016, on the year of Her Majesty´s 90th birthday, the very first miniature replica of the 900 year old oak tree was presented to Queen Elizabeth II at the Royal Academy of Arts, London - to launch the Bronze Oak Project and to represent the Monarchy´s central role in the protection of oak trees across the UK.

Queen Elizabeth II at the Royal Academy of Arts, October 2016
Image© Red Photographic

 

Learn more on the Bronze Oak Project's website here.

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