DSpace Repository :: Browsing Issue 3 by Issue Date

Item

EUROGRAPHICS - The First Five Years

(Blackwell Publishing Ltd and the Eurographics Association, 1984)

Item

Institutional Membership

(Blackwell Publishing Ltd and the Eurographics Association, 1984) Watkins, H.

Item

Executive Committee Elections 1985

(Blackwell Publishing Ltd and the Eurographics Association, 1984) Duce, D A

Item

EUROGRAPHICS Application Form for Institutional Membership

(Blackwell Publishing Ltd and the Eurographics Association, 1984) Watkins, H.

Item

An Algorithm for Determining the Intersection of Two Simple Polyhedra

(Blackwell Publishing Ltd and the Eurographics Association, 1984) Szilvasi-Nagy, M.

An algorithm is presented for the construction of the intersection of two simple possibly non-convex polyhedra. The methods of descriptive geometry are applied, so that this three-dimensional problem can be solved in two dimensions.We have to find all intersections of the edges of each polyhedron with the faces of the other, and these points of intersection can be found in Monge’s model. Projecting both polyhedra on the xy and on the xz coordinate planes we obtain two superimposed maps in both projections. The algorithm to find the intersection of two maps is based upon the Shamos-Hoey, the Bentley-Ottmann and the Nievergelt-Preparata algorithms. The asymptotic time requirement for determining the polygon of intersection of two polyhedra is O((N + S)log N), where N is the sum of the numbers of vertices of the two polyhedra and S is the total number of intersections of all projected edges in the xy-plane (S = O(N2)).