Hypoplasia of the hippocampal formation and the entorhinal cortex detected in early-but not late-onset schizophrenia

Abstract

An efficient algorithm to reconstruct objects from engineering drawings is proposed. All possible manifold objects are identified from drawings composed of orthographic views or auxiliary views. The objects are bounded by planes and quadratic surfaces and axes of quadratic surfaces should parallel to directions of projections. The algorithm first builds wireframes from drawings. Faces are created by searching loops in the wireframe. Depth information including solid curves and broken curves in the drawings are completely utilized to remove pathological edges and faces. Then the non-coexistent faces in the wireframe are removed by a divide-and-conquer algorithm in order that a manifold object would be composed of rest faces. Objects are constructed through the Euler operators in a non-manifold geometric model. Several non-trivial examples are given to demonstrate the completeness of the algorithm.