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Regions can be created out of multiple loops and out of open curves whose endpoints are
connected and form loops. Regions cannot be formed from open objects that intersect to form a
closed area: for example, intersecting arcs or self-intersecting curves.
Regions can also be created using BOUNDARY.
Composite regions can be created by combining, subtracting, or finding the intersection of regions.
Objects combined using UNION:
Objects combined using SUBTRACT:
Objects combined using INTERSECT:
4.10 SOLID MODELS
A solid model is a 3D representation that has such properties as mass, volume, center of gravity, and
moments of inertia.
Use solid models as the building blocks for your model. You can start with primitive solids such as
cones, boxes, cylinders, and pyramids. Draw a custom polysolid extrusion or use various sweeping
Amal Jyothi College of Engineering 33
