Abstract: Apparatuses and methods are disclosed for capturing three-dimensional images, particularly of all or parts of human subjects and employing polarization. In disclosed implementations, cross-polarized, whole-body images of human subjects can be captured.

Abstract: Apparatuses and methods are disclosed for capturing three-dimensional images, particularly of all or parts of human subjects and employing polarization. In disclosed implementations, cross-polarized, whole-body images of human subjects can be captured.

Abstract: Polygons defined in three-dimensional space are processed in order to facilitate subsequent manipulation. A first polygon is tested against a second polygon to identify a part of one of the polygons which may have a particular relationship. Thereafter, a second test is performed with reference to that polygon part. When producing rendering order lists, trees or directed graphs, a current favorite polygon (for placing on a list, tree or graph) is tested against a candidate polygon to determine whether the candidate polygon may be occluded by the favorite polygon. In performing this test a fragment of the favorite polygon may be identified which may occlude the candidate polygon and a fragment of the candidate polygon may be identified, as that which may be occluded by the current favorite. Thereafter, a second test is performed with reference to the fragment of the favorite polygon and the fragment of the candidate polygon.

Abstract: The generation of rendering order lists, trees or directed graphs is performed as a pre-process for an interactive three-dimensional graphic system. Notional viewing axes are selected and a rendering order list, tree or directed graph is produced for each of these axes. A favourite polygon is selected as being possibly suitable for placing on a list, tree or graph. The suitability of said favourite polygon is checked by comparing the extents in the direction of a notional viewing axis of a point on said favourite polygon with a point on a candidate polygon.

Abstract: Polygons defined in three-dimensional space are processed so as to determine a rendering order. Cycles are detected and broken by splitting a polygon into a plurality of smaller polygons. The procedure may be effected as a pre-process, for producing rendering order lists, trees or directed graphs.

Abstract: The generation of rendering order lists, trees or directed graphs is performed as a pre-process for an interactive three-dimensional graphics system. Notional viewing axes are selected and a rendering order list, tree or directed graph is produced for each of these axes. Viewable directions for a particular list, tree or graph are defined as a viewable region and the size of said region is extended to take account of the field of view of the viewer.