Thomson Licensing

Cyril Delalandre

Jean-Eudes Marvie

Pascal Gautron

A method and device for rendering a participating media delimited by a bounding box and rendered from a viewpoint, the media being at a determined distance from the viewpoint according to a viewing direction. In order to represent the limits of the participating media, the method comprises for at least one point of the volume formed by the bounding box, estimating a set of directions having for origin the at least one point; for each direction, estimating a first intersection point, corresponding to the intersection between the direction and the participating media, for which the associated density value is greater than a first threshold value; and estimating third intersection points, corresponding to the intersections between the viewing direction and the participating media, from an item of information representative of distances separating the first intersection point from a second intersection point corresponding to the intersection between the direction and the bounding box for each direction of the at least one part of the set of estimated directions.

Method for representing a participating media in a scene and corresponding device

A method for estimating the quantity of light received by a point M of a heterogeneous participating media, the light being emitted by a light environment. Thereafter, the method comprises estimating, for each point of a first set of points, first values representative of the light attenuation between the considered point and a first surface bounding the media along a plurality of particular directions of light emission, estimating first coefficients of projection by projection of the first values of reduction of light intensity in an orthonormal basis of spherical functions, estimating second values representative of the light attenuation between the point and a second surface along directions, the second surface comprising some of the points of the neighborhood of the point, and estimating the quantity of light received by the point using first coefficients of projection and second values of reduction of light intensity.

Method for computing the quantity of light received by a participating media, and corresponding device

The invention relates to a method for estimating the quantity of light scattered by a heterogeneous participating media, the light being transmitted by a light environment comprising a plurality of light sources. In order to improve the display while minimising the required calculation time, the method comprises steps for:

Method for estimating light scattering

The invention relates to a method for estimating the quantity of light scattered by a heterogeneous participating media. In order to optimise the display while minimising the required calculation time, the method comprises steps for selecting at least one level of spatial subdivision of said media from among a plurality of hierarchic levels of spatial subdivision according to at least one item of error information representative of an attenuation difference in said media according to at least one direction between two consecutive hierarchic levels, and estimating the quantity of light scattered by sampling of said media along at least one scattering direction, the sampling being a function of at least one selected spatial subdivision level.

Growing community of inventors

Montreuil le Gast, France

Cyril Delalandre