Geometric modellers

Geometric modellers build models from geometric solids, which have the attribute that mathematical formulae exactly define any point in 3D space occupied by these solids. Shapes include planes, cylinders, spheres, cones, toroids, etc. These shapes are combined using Boolean operations to produce the component.
The Boolean operations produce a 3D model by a combination of the following methods:
(a) resulting from the union of any two 3D objects or shapes;
(b) resulting from the difference between any two 3D objects or shapes;
(c) resulting from the volume that is common to any two 3D objects or shapes.

This approach is very successful for modelling machined components but cannot handle anything that might be described as having a freeform shape.





  • Manual of
    Engineering Drawing
    Second edition
    Colin H Simmons
    I.Eng, FIED, Mem ASME.
    Engineering Standards Consultant
    Member of BS. & ISO Committees dealing with
    Technical Product Documentation specifications
    Formerly Standards Engineer, Lucas CAV.
    Dennis E Maguire
    CEng. MIMechE, Mem ASME, R.Eng.Des, MIED
    Design Consultant
    Formerly Senior Lecturer, Mechanical and
    Production Engineering Department, Southall College
    of Technology
    City & Guilds International Chief Examiner in
    Engineering Drawing



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