As apart of the Memento - Traces of Identity project I participated in this Photogrammetry workshop. Photogrammetry involves obtaining accurate measurements from photographs of a physical object to create a 3D digital representation. It is done by a software placing thousands of points in relation to the shape of the object Photographed.
Notes from Talk:
Megan Swaffer work showcase from her masters degree - Life and death masks (mementos of life), 3d digital sculptures scanned in using photogrammetry, Using light boxes, looking at Historical artefacts.
Photogrammetry is Info taken from photos 3d scanning.
Bristol studios has 60 cameras used for photogrammetry of one object (Sample and Hold).
Was used by Simon withers tutor palace Henry the eighth jousting grounds.
600 to 1000 photos to digitise an object.
Models can be rendered in unity.
Software - Cloud compare (viewing the model), Blender, Fusion 360, sketch fab (for selling), Agisoft Metashape (making the model).
Photos need at least 50 percent overlap covering the entire surface of object.
Take 40 to 50 photos for around a 30 min render time.
Can use phone camera but a canon camera creates better quality renders.
Metashape Step by Step - Workflow add photos, select photos, workflow align photos, change quality, click on photos to align camera, workflow build dense cloud, export points, change file E57 2057.
Open in Cloud Compare to view, make a copy (click sheep) so you do not lose original, increase point size to make less gaps.
Save as mesh file in Cloud Compare.
In Metashape save as OBJ to import to Fusion 360.
Firstly, I found an object to photograph, in this case it was the bottom of a faux skull. I placed it on artificial grass and took 66 total photos around it so that it could be distinguished in Metashape.
These are all the photos I took; put into a sequence.
In Metashape I selected all of the photos and waited for it to collate all of the points. Some of the photos had misaligned cameras and so they had to be manually aligned before continuing. With 66 photos it took around 45 minutes for Metashape to process however this would have taken longer if I had used a canon camera instead of my iPhone.
These are some screenshots of the digital representation of the skull and grass in Cloud Compare. I experimented changing the size of the points and viewing angles to see all of the detail that the software had captured. The 3D scan is very reminiscent of the artist trope Memento Mori; the Latin word which means "remember you must die".
I really liked how the 3D scan looked on Cloud Compare so I cropped out the display window and edited three of the profiles in Photoshop using the Conté Crayon filter.
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