Three videos were shot with a six-camera rig and then the footage stitched together to form a flat video. The video is then wrapped onto a 3-dimensional sphere. The parameter sliders provide different views of the video as the virtual camera moves inside and outside the sphere.

 

Both the equirectangular projections (used to map the spherical camera view onto the flat video) and the stereographic projections (used to map the resulting video back onto the sphere) were known to the ancients as they developed maps of the world and celestial charts.

 

I also ported the original Openframeworks application to webgl/threejs for an online version (single low res video only): http://staging.lightwell.com.au/inlandsea/stereographic-video.html