Photogrammetry in an old forge

Before the launch of the Husqvarna museum exhibition we finally made one further improvement. We built a proper 3d environment, using Autodesk ReCap Photo and a Structure Sensor by Occipital, Mark II. The Journey went to Granshults faktorismedja just north of Jönköping where we made a final recording with our own blacksmith Master Gustav Thane. The small forge, just under 5×5 meters was scanned as a complement to the volumetric recordings with the multiple Intel RealSense cameras. The point clouds generated where placed by the anvil in the scanned 3d-inviroment. This really heightened the immersiveness of the experience.

Two things you need to know if you want to try this at home. (1) The Structure Sensor use an Iphone or Ipad to operate, if there is no internet connected, it will not work. It pretends to work, make all the sounds and trigonometry visualization, but it don’t. So even if you are stranded in a 17th century forge in the middle of nowhere you need to set up a wi-fi or equivalent to make it work. (2) The Autodesk ReCap Photo make really nice photogrammetry of objects, and it can be used with a drone, but it do not give you a room. So we had to pretende to capture the anvil, but we did so from a distance of almost 2 meters, getting a whole lot of the floor and room in the same pictures. This made ReCap automatically construct almost the whole forge in relatively high resolution, (photogrammetry is a technique where you take a lot of photos, 100 or so, and a software construct a 3d model based on it).

Eventually we did paste a few details from the Structure Core but those cannot compare in resolution and quality with the photogrammetry of ReCap and a high resolution professional grade camera. The problem was that the ReCap model turned out to be an over 1 GB file. It looked amazing but to avoid lag we scaled it down to 20% of full quality making it almost as poor quality as the Stucture Core files. Another problem was that the ReCap  was focused on the anvil. The workbenches and tools lying further away in the forge became sort of morphed. So we used a 3d modeling software to simply paste workbenches and a piece of the roof into the model, scaling it to life size and making sure the floor laid in the right place.

It looks a lot better, and it is so much fun to be able to walk around in the forge, on a floor, looking at tools and stuff.

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