Abstract: The disclosure notably relates to a computer-implemented method of computing a visibility function of a 3D scene. The method includes obtaining a set of directions ({right arrow over (?)}) in the 3D scene, computing a set of lines that are parallel to the direction, for each computed set of lines, sampling the lines of the set into spatial segments, associating each line of a set with a bit field, each spatial segment of the line corresponding to a bit of the bit field, superimposing the set of lines and the 3D scene, when a spatial segment of a line intersects a geometry in the 3D scene, marking the bit, corresponding to the spatial segment of the bit field, associated with the line, obtaining two points in the 3D scene, identifying spatial segments having a closest alignment with the query segment, computing the visibility of the query segment by performing a logical bit operation.

Abstract: The disclosure notably relates to a computer-implemented method of computing a visibility function of a 3D scene. The method includes obtaining a set of directions ({right arrow over (?)}) in the 3D scene, computing a set of lines that are parallel to the direction, for each computed set of lines, sampling the lines of the set into spatial segments, associating each line of a set with a bit field, each spatial segment of the line corresponding to a bit of the bit field, superimposing the set of lines and the 3D scene, when a spatial segment of a line intersects a geometry in the 3D scene, marking the bit, corresponding to the spatial segment of the bit field, associated with the line, obtaining two points in the 3D scene, identifying spatial segments having a closest alignment with the query segment, computing the visibility of the query segment by performing a logical bit operation.

Abstract: The invention notably relates to a computer-implemented method for rendering the global illumination of a three-dimensional scene. The method comprises providing a 3D scene that comprises of a set of triangles and one or more direct light sources, determining that each triangle of the set has an area that is below a threshold, assigning to each triangle of the set a radius of influence using a probability law, obtaining a subset of triangles by filtering out the triangles according to their radius of influence, rendering the three-dimensional scene by lighting its set of triangles, the triangle of the subset of triangles being used as indirect light sources according to their radius of influence.

Abstract: The invention notably relates to a computer-implemented method for rendering the global illumination of a three-dimensional scene. The method comprises providing a 3D scene that comprises of a set of triangles and one or more direct light sources, determining that each triangle of the set has an area that is below a threshold, assigning to each triangle of the set a radius of influence using a probability law, obtaining a subset of triangles by filtering out the triangles according to their radius of influence, rendering the three-dimensional scene by lighting its set of triangles, the triangle of the subset of triangles being used as indirect light sources according to their radius of influence.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A method and device for estimating the quantity of light received by an element of at least a participating medium belonging to a light ray crossing the at least a participating medium and having as origin a light source. As to optimize the estimation and the rendering of the at least a medium, the method comprises determining a pseudo-metric function according to intersection points between the participating medium and the light ray, the pseudo-metric function representing the distance only along the part(s) of the light ray crossing the participating medium; estimating first projection coefficients in a functions basis, the first coefficients being representative of an extinction function along the light ray according to the pseudo-metric function; and estimating the quantity of light received by the element according to the first projection coefficients.

Abstract: 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: estimation of first projection coefficients in an orthonormal basis of spherical functions, said first projection coefficients being representative of the reduction of light intensity in a point of said media, said estimation of first projection coefficients being carried out for each point of a first set of points of said media, and estimation of the quantity of light scattered by said media, according to at least one scattering direction of the light, using said first estimated projection coefficients.

Abstract: 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 neighbourhood 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.

Abstract: 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.

Abstract: The invention relates to a method for estimating the quantity of light scattered by a heterogeneous participating media. In order to improve the display while minimizing the required calculation time, the method comprises steps for estimating projection coefficients in a function database using values representative of density for a set of points of said media situated along at least one emission direction of light by a light source, and for estimating of the quantity of light scattered by said media, according to at least one diffusion direction of the light, using said estimated projection coefficients.

Abstract: 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.

Abstract: The invention relates to a method for estimating the quantity of light scattered by a heterogeneous participating media. In order to improve the display while minimising the required calculation time, the method comprises steps for: estimation of projection coefficients in a function basis using values representative of density for a set of points of said media that are situated along at least one emission direction of light by a light source, and estimation of the quantity of light scattered by said media, according to at least one scattering direction of the light, using said estimated projection coefficients.

Abstract: 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: estimation of first projection coefficients in an orthonormal basis of spherical functions, said first projection coefficients being representative of the reduction of light intensity in a point of said media, said estimation of first projection coefficients being carried out for each point of a first set of points of said media, and estimation of the quantity of light scattered by said media, according to at least one scattering direction of the light, using said first estimated projection coefficients.