Temel izdüşüm görünüşlerinden bilgisayar destekli üç boyutlu nesnelerin elde edilmesi

Bu makalede nesnelerin üç temel izdüşümünden 3B katı modeller oluşturulması alanında yürütülen bir çalışma tanıtılmaktadır. AutoCAD 2000 ortamında çizilen izdüşümlerin, 2 Boyutlu (2B) köşe verileri tanınmakta, 3B'a dönüştürülmekte, 3 Boyutlu (3B) köşelerin birleştirilmesi ile 3B yüzeyler elde edilmekte ve bunların da birleştirilmesi ile 3B nesneler elde edilmektedir. Bu nesnelerin 3B temsili, sınır temsili (Brep) yaklaşımı ile yapılmaktadır. 2B'dan 3B'a otomatik dönüştürme amacıyla Visual LISP kodunda bir program yazılmıştır. Bu programın kullanılması ile, eğrisel yüzeyleri içermeyen düzgün geometrik yüzeylerden oluşan nesne dönüşüm işlemleri kolayca yapılabilmektedir.

Computer aided reconstruction of 3D objects from basic orthographic projections

This paper describes a research work conducted for the reconstruction of Three-dimensional (3D) objects from their three orthographic projections. The conversion process from Two-dimensional (2D) to 3D is performed by using the projection drawings created by AutoCAD 2000 drafting package. During this process the following steps are carried out: generation of 3D vertices, 3D edges and 3D faces and creation of 3D objects. BRep approach is used for the representation of objects. A computed program, written in Visual LISP, has been developed to use for the automatic conversion of orthographic projections. It is possible to employ this program such a conversion and reconstruction requirement that includes polyhedral objects.

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