1
Roy W Latham: Method for tree-structured hierarchical occlusion in image generators. Loral Aerospace Corporation, Roy W Latham, April 16, 1996: US05509110 (42 worldwide citation)

A method for determining which objects are visible in each pixel of a digitally-generated image is described. The method uses comparison of distances from the viewpoint (Z-sorting) for occlusion. The number of Z comparisons required is minimized by utilizing a hierarchy of regions in the screen area ...


2
Roy W Latham: Computer-implemented method of rendering an image of smoke. Kenneth W Float, February 6, 2001: US06184857 (19 worldwide citation)

A method of simulating the appearance of smoke in an electronically generated video image that uses one or more intersecting opaque spheres. Each sphere has a nonuniform smoke density that produces feathered edges. The smoke sphere is an object modeled as a center point (the coordinates of the cente ...


3
Roy W Latham: Video processor architecture with distance sorting capability. The Singer Company, Barry L Haley, Douglas M Clarkson, May 31, 1988: US04748572 (17 worldwide citation)

The specification describes a way of using distance sorting in order not to require a prioritization of those polygons that are to be rendered prior to a pixel-by-pixel construction of an image. The video processor recalls the input data into the pixel processor at least a number of times equal to t ...


4
Roy W Latham, Albert N Schultz Jr: Airborne positioning system. Grumman Aerospace Corporation, Morgan Finnegan Pine Foley & Lee, August 17, 1976: US03975731 (13 worldwide citation)

An airborne positioning system for acquiring range information from at least three distance measuring equipment (DME) stations, including a computer controlled range gate and means for estimating and removing bias errors from range measurements and smoothing noise to accurately determined aircraft p ...


5
Roy W Latham, David R Marsh, Peter O Driscoll: Computer controlled robotic system for unencumbered movement. Computer Graphics Systems Development Corporation, Douglas M Clarkson, June 22, 1999: US05913684 (6 worldwide citation)

A locomotion simulator has two independently controlled movable footpads. Each footpad is positioned dynamically in three-dimensions. The top of each footpad has a controlled rotational motion, and the assembly having the two footpads is rotated under control. In operation, a user, whose feet are tr ...


6
Judit K Florence, Roy W Latham: Log mixer circuit. The Singer Company, Douglas M Clarkson, Barry L Haley, March 29, 1988: US04734875 (3 worldwide citation)

A logarithmic mixer circuit in the form of a conversion circuit for mixing digital representations of logarithmic values eliminating the usual mathematical processes of determining anti-logs, summing them and then determining the logs again, the invention using addition, subtraction and a look up ta ...