Читать книгу Computer Aided Design and Manufacturing - Zhuming Bi - Страница 70

The procedure of CSG modelling is as follows:

1 Define a set of solid primitives.

2 Create dimensional variables and constraints of solid primitives.

3 Transform each solid primitive into the appropriate position, applying the generalized set operations.

4 Finally, combine elemental solids to generate a unique and legal solid model.

The above procedure shows that the resulting solid model is affected by (i) the set of solid primitives and dimensions, (ii) locations and orientations of solid primitives, and (iii) the types and orders of the Boolean operations of solid primitives. Figure 2.32 shows different solid models from the same set of solid primitives.

Figure 2.32 Different solid models from the same set of solid primitives.