Stencils are volumes, not meshes really in a sense. And they are sharp, so no soft shadows.
Hardest part is calc'ing the shadow volume and casters silhouettes... pretty good explanation here:
http://www.gamedev.net/reference/articles/article1873.asp
Hardest part is calc'ing the shadow volume and casters silhouettes... pretty good explanation here:
http://www.gamedev.net/reference/articles/article1873.asp