Patent ID: 7508389

Claim:
A computer-aided selection method for a part of a volume, comprising: evaluating, using a computer, only a selected part of the volume, wherein the selected part is in the form of a polyhedron with polyhedron surfaces, with each polyhedron surface being bounded by polyhedron edges and with each polyhedron edge being bounded by polyhedron corners bounding only two polyhedron surfaces, wherein the polyhedron corners are for the computer in order to determine the selected part, wherein the polyhedron edges and polyhedron surfaces are determined automatically by the computer on the basis of the polyhedron corners, wherein a user determines repositioning for one of the polyhedron corners for the computer, wherein the computer then redetermines those polyhedron edges and polyhedron surfaces which contain the repositioned polyhedron corner in order to determine the selected part, wherein at least one of the polyhedron surfaces which contain the polyhedron corner to be repositioned is in the form of a polygon with more than three polyhedron corners, and wherein the at least one polyhedron surface is replaced by the computer by polyhedron surfaces which are in the form of triangles, each containing one polyhedron edge which is not bounded by the polyhedron corner to be repositioned of the polygon as well as the repositioned polyhedron corner.