By Dr. Hiroshi Toriya, Prof. Dr. Hiroaki Chiyokura (auth.), Dr. Hiroshi Toriya, Prof. Dr. Hiroaki Chiyokura (eds.)
3D CAD is likely one of the most vital applied sciences of the 90s for the engineering and production international. 3D CAD structures gives you a aggressive area within the improvement of latest items. This ebook offers the improvement of a three-d CAD procedure and its wide variety of functions. It describes the options of reliable versions, and the idea of curves and surfaces and it illustrates those techniques via "reals global" applications.
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Extra resources for 3D CAD: Principles and Applications
The edge can be of the curve type. 42 3. SOLID MODELER DESIGNBASE MVE KVE Fig. 22. , Ed, Vii, V2i, E2i, E3T) MDEV is the operation to create an edge of length 0 El by specifying a vertex V2 and two edges E2 and E 3. KDEV is its reverse operation. 23). The edges E2 and E3 form two of the winged edges of E1 • MDEV KDEV Fig. 23. ) MCLKPL is the operation to convert a loop L2 into a C-loop of the P-loop L 1 • KCLMPL is its reverse operation. 24). KCLMPL converts a loop L2 from a C-loop to a P-loop.
On the other hand, there are geometric elements which describe the shape of a model. These are explained below: • Surface Indicates the shape of a face in 3-dimensions. It is associated with the face in the topological elements. • Curve Indicates the shape of a line in 3-dimensions. It is associated with the edge in the topological elements. 28 3. __-- vertex loop edge---~ face Fig. 2. Topological elements of a solid model in a B-reps based system • Point Indicates coordinates in 3-dimensions. It is associated with the vertex in the topological elements.
15. P-Ioop I ,---'-------'----,I-I ----------= C-Ioop 1 C-Ioop 2 I-I C-Ioop 3 1- 0 Fig. 15. List structure between P-Ioop and C-Ioop The data structures of the four topological elements used in DESIGN BASE - body, loop, edge, and vertex - are shown below. 4 Data Structure of Boundary Representations 35 because a shell can be obtained from the winged-edge structure as the occasion demands. 4 Data structure of geometric elements in DESIGN BASE In DESIGN BASE, geometric coordinates are stored as elements belonging to a vertex.
3D CAD: Principles and Applications by Dr. Hiroshi Toriya, Prof. Dr. Hiroaki Chiyokura (auth.), Dr. Hiroshi Toriya, Prof. Dr. Hiroaki Chiyokura (eds.)