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Download 3D CAD: Principles and Applications by Dr. Hiroshi Toriya, Prof. Dr. Hiroaki Chiyokura (auth.), Dr. PDF

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 crucial applied sciences of the 90s for the engineering and production global. 3D CAD structures delivers a aggressive area within the improvement of latest items. This ebook provides the advance of a third-dimensional CAD approach and its wide variety of purposes. It describes the ideas of reliable types, and the speculation of curves and surfaces and it illustrates those innovations via "reals global" applications.

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4[162]. In a B-reps based system, both topological and geometric elements have to be considered. For example, when executing a Boolean operation, both the intersection curves (geometric elements) between two curved surfaces, and the edges (topological elements) created on the intersection curves have to be considered. 2 Data structures of boundary representations This subsection describes the data structures that efficiently store B-reps based solid models. 4 Data Structure of Boundary Representations Topological elements 29 Geometric elements Fig.

Which faces are connected to either side of an edge. As Weiler presented in his paper, there are nine relationships in an adjacency topology of faces, edges, and vertices. 5 could be completely represented, then the other eight relationships would be possible[158]. (a) When a face (F) is viewed from the outside of a solid, edges (E) surrounding the face can be referenced in the same direction, usually counterclockwise (FE adjacency relationship). (b) When a vertex (V) is viewed from the outside of a solid, edges (E) connected to the vertex can be referenced in the same direction, usually clockwise (VE adjacency relationship).

SOLID MODELER DESIGNBASE 46 First, we look at the function "prMevvl". This function is programmed based on the MEVVL operation. This operation creates a straight line edge by using the data of two vertices, and it is the simplest of the many topological operations. Note that dbBodyList is the array of the dbBody type and the memory area for this array is allocated in advance. 1* * prKevvl --- Make an edge, two vertices, and a loop * * Parameters: (I) Body 1D body * (0) ID of the created edge edge * (0) 1D of the start vertex of the created edge vertex1 * vertex2 (0) 1D of the end vertex of the created edge * (0) ID of the created loop loop * point 1 (I) Coordinates of the start vertex * point2 (I) Coordinates of the end vertex * *1 void prMevvl(body, edge, vertex1, vertex2, loop, point1, point2) int body,*edge, *vertex1, *vertex2, *loop; struct dbPoint *point1, *point2; { struct dbEdge *pE; struct dbLoop *pL; struct dbVertex *psV, *peV; 1* * Set the edge ID to be generated to "edge".

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