The Social Computing Room (SCR) is a novel collaborative visualization environment for viewing and interacting
with large amounts of visual data. The SCR consists of a square room with 12 projectors (3 per wall) used to
display a single 360-degree desktop environment that provides a large physical real estate for arranging visual
information. The SCR was designed to be cost-effective, collaborative, configurable, widely applicable, and
approachable for naive users. Because the SCR displays a single desktop, a wide range of applications is easily
supported, making it possible for a variety of disciplines to take advantage of the room. We provide a technical
overview of the room and highlight its application to scientific visualization, arts and humanities projects, research
group meetings, and virtual worlds, among other uses.
<i>Volumetric depth peeling</i> (VDP) is an extension to volume rendering that enables display of otherwise occluded features in volume data sets. VDP decouples occlusion calculation from the volume rendering transfer function, enabling independent optimization of settings for rendering and occlusion. The algorithm is flexible enough to handle multiple regions occluding the object of interest, as well as object self-occlusion, and requires no pre-segmentation of the data set. VDP was developed as an improvement for virtual arthroscopy for the diagnosis of shoulder-joint trauma, and has been generalized for use in other simple and complex joints, and to enable non-invasive urology studies. In virtual arthroscopy, the surfaces in the joints often occlude each other, allowing limited viewpoints from which to evaluate these surfaces. In urology studies, the physician would like to position the virtual camera outside the kidney collecting system and see inside it. By rendering invisible all voxels between the observer's point of view and objects of interest, VDP enables viewing from unconstrained positions. In essence, VDP can be viewed as a technique for automatically defining an optimal data- and task-dependent clipping surface. Radiologists using VDP display have been able to perform evaluations of pathologies more easily and more rapidly than with clinical arthroscopy, standard volume rendering, or standard MRI/CT slice viewing.