Textured 3D Model of the great hall at Castle Rheinsberg, Germany/ Schloss Rheinsberg

Description

Technical info (English)

The primary focus of the campaign in this instance was the Spiegelsaal. The room measures approximately 12.5 x 11m with a ceiling height of between 5.0 and 5.5m. It has three large windows on the east and west sides, interspersed with full-length mirrors. An initial capture of the entire room was made with the Nikon D850 and wide-angle (12 mm) lens consisting of 133 images (F/4, ISO 125, 1/10 exposure). For the high-resolution imaging of the ceiling, CHAPI was used with the D850 and a full-frame 105mm lens (F/11, ISO 125 and variable exposure). 

827 images were taken with an 80% overlap. The distance to the ceiling was 4.5m and the field of view 150x100cm, giving a GSD of .185mm (185µm). Due to the available light being highly variable (a bright day with intermittent cloud cover), and changing dramatically even between individual photos, an exposure time of between 1/3 and 1 seconds was used and adjusted manually according to light conditions. Due to the long exposure time, CHAPI was used in semi-automatic mode, with the distance travelled measured automatically but the camera triggered manually. To ensure all areas of the painting would be captured after masking, a further set of four rings (67 images) were taken at a slight angle around each of the chandeliers (at f/16 to give a greater depth of field). Another set of 307 images were taken of the vaulting, with a 50mm lens (F/11, ISO 125) at 45°, as well as some extra images of the stucco on the doors and around the mantelpieces.