Thomas D Lokovic, 497019 Lyons View Ct, Murrysville, PA 15668

7023438, Apr 4, 2006

Oct 14, 2003

10/686551

Thomas David Lokovic - Richmond CA, US
Eric Hugh Veach - Mountain View CA, US

Pixar - Emeryville CA

G06T 15/50

345426, 345421, 345422, 345424, 345427, 345582, 345589

A method and apparatus for rendering shadows. A pre-rendering process implements a two dimensional array or map of depth-based functions, such as a visibility function in z. During rendering of an object scene, these functions are accessed via lookup operations to efficiently determine the function value for a sample point at a given depth. The use of visibility functions allows for partial light attenuation effects. Each visibility function is computed by filtering multiple transmittance functions obtained by casting sample rays from a light source onto an object scene. The visibility function is implemented as a sequence of vertices. Colored shadows are modeled by vertices comprising a depth value and separate visibility function values for red, green, and blue light at a given depth value. Compression is achieved by minimizing the number of vertices needed to represent a visibility function within a desired error tolerance.

7233332, Jun 19, 2007

Nov 14, 2005

11/274883

Thomas David Lokovic - Richmond CA, US
Eric Hugh Veach - Bellevue WA, US

Pixar - Emeryville CA

G06T 15/50

345426, 345421, 345422, 345424, 345427, 345581, 345582, 345586, 345589, 345629

A method and apparatus for rendering shadows. A pre-rendering process implements a two dimensional array or map of depth-based functions, such as a visibility function in z. During rendering of an object scene, these functions are accessed via lookup operations to efficiently determine the function value for a sample point at a given depth. The use of visibility functions allows for partial light attenuation effects. Each visibility function is computed by filtering multiple transmittance functions obtained by casting sample rays from a light source onto an object scene. The visibility function is implemented as a sequence of vertices. Colored shadows are modeled by vertices comprising a depth value and separate visibility function values for red, green, and blue light at a given depth value. Compression is achieved by minimizing the number of vertices needed to represent a visibility function within a desired error tolerance.

7348977, Mar 25, 2008

Mar 25, 2004

10/810064

Bradley S. West - Seattle WA, US
Thomas Lokovic - Richmond CA, US
David Batte - Albany CA, US

Pixar - Emeryville CA

G06T 15/50

345426

A method for determining illumination of surface points of an object in a scene from lighting sources includes determining a first thickness map for a first lighting source for the scene, wherein the first thickness map includes a first plurality of thickness values of the object with respect to distance from the first lighting source, determining a surface point on the object, determining a first plurality of thickness values associated with the surface point on the object in response to the first thickness map, determining a first filtered thickness value associated with the surface point on the object in response to the first plurality of thickness values, and determining an illumination contribution from the first lighting source at the surface point in response to the first filtered thickness value.

8645391, Feb 4, 2014

Jul 2, 2009

12/497176

Yuk Wah Wong - Pittsburgh PA, US
Dominic Widdows - Pittsburgh PA, US
Thomas David Lokovic - Murrysville PA, US
Kamal P. Nigam - Pittsburgh PA, US

Google Inc. - Mountain View CA

G06F 7/00

707748, 707749, 707758, 715206, 715234

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for attribute-value extraction from structured documents. In one aspect, a method includes obtaining an initial attribute whitelist, extracting candidate attributes from a first collection of documents, and grouping the candidate attributes. The method further includes calculating a score for each unique attribute in the candidate attributes, generating an expanded attribute whitelist including the initial attributes and each unique attribute having a score that satisfies a threshold, and using the expanded attribute whitelist to identify valid attribute-value pairs. In another aspect, a method includes extracting candidate attribute-value pairs from a collection of documents and identifying one or more features for each candidate attribute-value pair. The method further includes filtering out non valid attribute-value pairs.

6760024, Jul 6, 2004

Jul 19, 2000

09/619064

Thomas David Lokovic - Richmond CA
Eric Hugh Veach - Redwood City CA

Pixar - Emeryville CA

G06T 1540

345421, 345422, 345426, 345427, 345582

A method and apparatus for rendering shadows. A pre-rendering process implements a two dimensional array or map of depth-based functions, such as a visibility function in z. During rendering of an object scene, these functions are accessed via lookup operations to efficiently determine the function value for a sample point at a given depth. The use of visibility functions allows for partial light attenuation effects such as partially blocking surfaces, semi-transparent surfaces and volumetric elements, to be accurately modeled over a range of z. Each visibility function is computed by filtering multiple transmittance functions obtained by casting sample rays from a light source onto an object scene. The visibility function is implemented as a sequence of vertices, each comprising a depth (z) value and corresponding function value. Colored shadows are modeled by vertices comprising a depth value and separate visibility function values for red, green and blue light at the given depth value.