VISIBILITY SILHOUETTES FOR MASKED SPHERICAL INTEGRATION

摘要

The disclosure provides an approach for determining, in 3D rendering, the integrals of visibility-masked spherical functions using visibility silhouettes. For a given shade point, the visibility silhouette for that shade point includes a set of edges from the scene geometry which form the boundaries between visible and invisible regions of a hemisphere having the shade point as its center. For each shade point, a rendering application determines a set of contour edges of scene geometry, the contour edges being a superset of the set of visibility silhouette edges, by querying a 4D dual mesh. The rendering application then evaluates the integral of the visibility-masked spherical function for a given shade point by integrating over segments of discrete u-isolines for which an overlap function indicates that a ray from the shade point would not intersect scene geometry.

主权项

1. A computer-implemented method, comprising:
receiving geometry of a scene; and for each of a plurality of shade points in the scene:
determining a visibility silhouette, the visibility silhouette having edges which define boundaries between visible and occluded regions from a perspective of the shade point, anddetermining a spherical visibility-masked integral, wherein spherical visibility in the integral is represented by the visibility silhouette.