Patents by Inventor William Bilodeau

William Bilodeau has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for rendering shadows using a shadow volume and a stencil buffer
    Patent number: 6384822
    Abstract: A method for real-time shadow rendering in a 3-D graphics scene uses an inverted z-test to mark a shadow area in a stencil buffer. Front and back facing shadow volume polygons are rendered subsequent to rendering the scene and corresponding stencil buffer entries are incremented for pixels viewing the back facing polygon when the new z-test is passed and decremented for pixels viewing the front facing polygons when the new z-test is passed. The new z-test is passed for pixels having depth (z) values greater than the corresponding depth value stored z-buffer.
    Type: Grant
    Filed: October 13, 1999
    Date of Patent: May 7, 2002
    Assignee: Creative Technology Ltd.
    Inventors: William Bilodeau, Michael Songy