Richard P Hammersley

US Patent:

6373489, Apr 16, 2002

Filed:

Jan 12, 1999

Appl. No.:

09/228714

Inventors:

Hong-Qian Lu - Austin TX
Richard P. Hammersley - Austin TX

Assignee:

Schlumberger Technology Corporation - Austin TX

International Classification:

G06T 1700

US Classification:

345428, 345420, 345423, 345427

Abstract:

A method, computer system and article of manufacture for visualizing a model including a first surface is disclosed. The method includes determining, as the model is being built, the rendering resolution of a portion of the first surface based on a view frustum from which the first surface is to be viewed and rendering the portion of the first surface on the output device using the rendering resolution. The vertices and edges to be rendered are selected based on the view frustum, using view frustum culling and bounding sphere projection. The vertices and edges selected to be rendered are tessellated using incremental and decremental tessellation. The tessellated vertices and edges are rendered. Predictive techniques are used to estimate future view frustums. Quality may be traded off against performance by adjusting parameters.

US Patent:

6693631, Feb 17, 2004

Filed:

Jan 5, 2001

Appl. No.:

09/755268

Inventors:

Andreas G. P. Hubeli - Zurich, CH
Markus H. Gross - Uster, CH
Richard P. Hammersley - Austin TX

Assignee:

ETH Zurich - Zurich
Schlumberger Technology Corporation - Austin TX

International Classification:

G06T 1700

US Classification:

345420

Abstract:

A method of fairing a non-manifold model as disclosed which includes smoothing the model by applying a fairing operator to a set of features such that noise is removed after determining the features of the model.

US Patent:

6760023, Jul 6, 2004

Filed:

Mar 22, 2002

Appl. No.:

10/104089

Inventors:

Andreas G. P. Hubeli - Maroggia, CH
Richard P. Hammersley - Austin TX

Assignee:

Schlumberger Technology Corporation

International Classification:

G06T 1500

US Classification:

345420

Abstract:

Simplifying a surface represented as a height field. The simplification resulting in a triangular mesh having n vertices, such that the topology of the surface is maintained in the simplified surface representation. The simplification including assigning error values to each vertex not having a missing value, identifying as required vertices those vertices that may not be removed without altering the topology of the surface; and (1) if n is less than or equal the number of required vertices, remove all other vertices or (2) if n is greater than or equal the number of required vertices, remove u-n vertices, where u is the number of vertices that do not have missing values in the original height field.

US Patent:

6910001, Jun 21, 2005

Filed:

Mar 22, 2001

Appl. No.:

09/815127

Inventors:

Richard P. Hammersley - Austin TX, US
Hong-Qian Lu - Austin TX, US

Assignee:

Schlumberger Technology Corp. - Houston TX

International Classification:

G06F017/10
G06T017/00

US Classification:

703 2, 345420, 345423, 345428, 709203

Abstract:

A distributed multiresolution modeling system has a database management system on a first server. The database management system provides access to a hierarchical tree representation of surfaces of geometric models. Client programs executing on computers connected to the first server accesses and updates the model by traversing the hierarchical tree representation until a terminating criterion has been satisfied. During the traversal the client programs request quad-tree nodes from the database management system.

US Patent:

63138379, Nov 6, 2001

Filed:

Sep 29, 1998

Appl. No.:

9/163075

Inventors:

Steven Brent Assa - Storeys Way, GB
Richard Paul Hammersley - Austin TX
Hong-Qian Lu - Austin TX

Assignee:

Schlumberger Technology Corporation - Austin TX

International Classification:

G06T 1700

US Classification:

345420

Abstract:

A method, computer system and computer program are disclosed for representing a first surface at multiple levels of resolution. The first surface is partitioned into nodes with one or more boundaries, each level of resolution having a subset of the boundaries. A second surface may be classified against the first surface. Surfaces and the model may be decimated. Portions of the surfaces may be loaded from persistent memory on demand and removed when no longer required.