Spherical panoramas look great in VR; 3-D spheres look spectacular. You can create stereoscopic spheres with standard panography tools, but it takes a lot of photos, a lot of skilled work, and considerable luck. To make 3-D spherical panography really practical, new tools are needed.
PT3D is a "helper tool" for stitching stereo panoramas that inserts 3D-aware image alignment and correction into the familiar PTGui stitching flow. It reads a project aligned by PTGui, re-analyzes it using techniques borrowed from photogrammetry and 3D modelling, and outputs corrected images and a new project for stitching them. The resulting panorama is aligned and warped more accurately than PTGui would have done by itself, and needs less hand work to make it look perfect - using the regular PTGui and Photoshop masking and blending tools.
PT3D is optimized for 6 to 12 shots around with a stereo pair of cameras, but also works with photo sets taken with the one-camera "cha-cha" method, one-shot spherical arrays, even stereo triples. Thomas will show examples, and of course expound a bit on the theory.