2B İzdüşüm görünüşlerinden otomatik 3B sınır temsili modellerin oluşturulması

Bu makalede üç temel izdüşümden 3B katı model oluşturulması konusunda yürütülen bir araştırma tanıtılmaktadır. AutoCAD 2000 ortamında çizilen izdüşümlerin; 2B köşe verileri tanınmakta, 3B'a dönüştürülmekte, 3B'lu 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 bilgisayar programı yazılmıştır. Bu programın kullanılması ile, düzgün geometrik yüzeylerden oluşan nesne dönüşüm işlemleri kolayca yapılabilmektedir.

Reconstructions of 3D boundary representation models from their three orthographic projections

This paper describes a research work conducted for the reconstruction of 3D objects from their three orthographic projections. The conversion process from 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 computer 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.

___

1.Wang, W., Grinstein, G. G, A survey of 3D solid reconstruction from 2D projection line drawings, Computer Graphics Forum. 12 : (2), 137-158, (1993).
2.You, C. F., Yang, S, S., Reconstruction of curvilinear manifold objects from orthographic views, Computers &Graphics. 20, 2, 275-293, (1996).
3.Sakurai, H., and Grossard, D. C, Solid model input through orthographic views, Computer Graphics. 17, 3, 243-251, (1983).
4.Idesawa, M., A System to Generate A Solid Figure From A Three View, Bull. JSME 16,216-225,(1973).
5.Shin, B.S., Shin, Y. G., Fast 3D soild model reconstruction from orthographic views, Computer Aided Design. 30, 1, 63-76, (1998).
6.Nagendra, I.V., Gujar, U. G.., 3D object from 2D orthographic views: a survey, Computer and Graphics. 12. 1. 111-114, (1988).
7.Shum, S. S. P., Lau, W. S., Yuen, M. M. F., Yu, K. M.., Solid reconstruction from orthographic opaque views using incremental extrusion,, Computer & Graphics. 21, 6, 787-800, (1997).
8.Idesawa, M., Soma, T., Goto, E., Shibata, S., Automatic input of line drawing and generation of solid figure from three view data, Proceedings of the International Joint Computer Symposium. 304-311, (1975).
9.Markowsky, G. and Wesley, M. A., Fleshing out wire frames, IBM J. Res. Develop.,24,582-587, (September 1980).
10; Markowsky, G., Wesley, M.A., Fleshing out Projections, IBM J. Res.& Develop.,25,934-954, (November 1981).
ll.Lafue, G., Recognition of three dimensional objects from orthographic views, Computer Graphics. 10, 2, (1976).
12.Preiss, K., Algorithms for automatic conversion of a 3-View drawing of a plane faced part to the 3-D representation, Computers in Industry. 2, 133-139, (1981).
13.Gu, K., Tang, Z., Sun, J., Reconstruction of 3D objects from orthographic projections, CG Forum. 5, 807-811, (1985).
14.Laquette, R., Automatic construction of curvilinear solids from wireframe views, Computer Aided Design. 20. 4. 171-180. (1988).
15.You, C.F., Yang, S. S., Reconstruction of curvilinear manifold objects from engineering drawings, Proceedings of the 12th National Conference of the Chinese Society of Mechanical Engineers. Chia-Yi,*Taiwan, 637-646, (1995).
16.Tanaka, M., Iwama, K., Hosoda, A., Watanabe, T., Decomposition of a 2D assembly drawing into 3D part drawings, Computer Aided Design. 30, 1, 37-46, (1998).
17.Shpitalni, M., Lipson, H., Identification of faces in a 2D line drawing projection of a wire frame object, IEEE Transactions on Pattern Analysis and Machine Intelligence, 18, 10, (1996).
18.Yan, Qing-wen., Chen, C. L. P., Tang, Z., Efficient algorithm for the reconstruction of 3D objects from orthographic projections, Computer Aided Design. 26, 9, 699-717, (1994).
19.Dutta, D., Srinivas, Y.L., Reconstruction of curved from the polygonal orthographic views, Computer Aided Design. 24, 3, 149-159, (1992).
20.Masuda, H., Masayuki, N., A Cell-Based approach for generating solid objects from orthographic projections, Computer Aided Design. 29, 3, 177-187, (1997).
21.Shum, S.S.P., Lau, W.S., Yuen, M.M.F., Yu, K.M., Solide reconstruction from orthographic views using 2-Stage extrusion, Computer Aided Design. 33. 91-102, (2001).
22.AutoCAD Release 12 Customization Manual. Autodesk, Inc., (June 1992).