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 rendering a participating media comprised in a scene, the media being delimited by a bounding box, said participating media being 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 the volume formed by said bounding box, estimating a set of directions having for origin said at least one point and distributed according to at least one half-sphere of which the base is centred on said at least one point, for each direction of at least one part of the set of estimated directions, estimating a first intersection point, corresponding to the intersection between said direction and said participating media, for which the associated density value is greater than a first threshold value, said first intersection point being estimated by starting from a second intersection point corresponding to the intersection between said direction and said bounding box, and estimating 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 set of estimated directions.