Importance

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Abstract

A process for eliminating hidden faces for synthesis of a three-dimensional wire image from the set of edges of a wire image, the edges being provided with priority parameters making it possible to restore the appearances of a third-dimension. The process consists of: cutting the set of ordinate values into intervals [Y(i),Y(i+1)] as a function of the ordinates of the edge ends; determining, in each interval [Y(i),Y(i+1)], the coordinates of intersection points (I1 . . . I4) of the edges; making, for each edge (AB), an arranged list of points of intersection of this edge with more priority edges; determining, for each intersection point (I1 . . . I4), the value of an indicator indicating whether the facet of the most priority edge masks the least priority edge, starting from the intersection point considered, or masks it before the intersection point considered or else masks it before and after the intersection point; determining, for first end (A) of each edge, the number of facets that mask this first end; determining the segments of this edge that are visible and those that are hidden, by determining the number of facets that mask each segment, from the number of facets that mask first end (A) of the edge, and from the values of the indicators for intersection points (I1 . . . I4) of this edge (AB) with more priority edges.

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First Claim