Extrudes silhouette edges away from the light and uses the stencil buffer to count entries and exits. Geometrically exact, with no resolution artifacts, but fill-rate cost scales badly.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
Colour is the family; a dashed line is the second member of it.
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alternative-tois a competing approach to Shadow Mappingexact silhouettes, but fill-rate bound
References
Shadow Algorithms for Computer Graphics — Crow — 1977 · link