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

摘要

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.

主权项

1. A method for computing a quantity of light received by a point M of a heterogeneous participating medium, light being emitted by a light environment comprising a plurality of light sources, wherein the method comprises:
selecting some of the points of said heterogeneous participating medium to form a first set of points of said heterogeneous participating medium, said first set comprising said point M, for each point of said first set, computing a plurality of first values of reduction of light intensity representative of light attenuation between said each point and a first surface along a plurality of particular directions of light emission, the first surface bounding the heterogeneous participating-medium, computing a plurality of second values of reduction of light intensity representative of light attenuation between said point M and at least one second surface along the plurality of particular directions of light emission, the at least one second surface comprising some of the points of a neighborhood of said point M belonging to the first set, for each point of said first set, computing first coefficients of projection representative of a reduction of light intensity at said point by projection of said first values of reduction of light intensity in an orthonormal basis of spherical functions, and computing the quantity of light received by said point M using said computed first coefficients of projection and the plurality of second values of reduction of light intensity.