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

摘要

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.

主权项

1. A method of displaying an image representative of a virtual scene comprising a participating media, the participating media being delimited by a bounding box, said participating media rendered from a viewpoint at a determined distance from the viewpoint according to a viewing direction, wherein the method comprises:
for at least one point of a volume formed by said bounding box, determining a set of directions having for origin said at least one point distributed according to at least one half-sphere of which a base is centered on said at least one point; for each direction of at least one part of the set of determined directions, determining a first intersection point, corresponding to the intersection between said direction and said participating media, for which an associated density value is greater than a first threshold value, said first intersection point being determined by starting from a second intersection point corresponding to the intersection between said direction and said bounding box; determining third intersection points, corresponding to the intersections between said viewing direction and said participating media, from an item of information representative of distances separating the first intersection point from the second intersection point for each direction of the at least one part of the of determined directions, said item of information representative of distances being stored in a memory; and displaying pixels of said image, light values associated with said pixels being calculated according to said third intersection points.