chapter  7
2D Shapes
Pages 18

A simple 2D shape, a circle for example, can be extruded into a 3D cylinder. However, 2D shapes can be attached to each other to become a Compound shape, a single shape containing multiple Spline subobject entities. When a compound shape is extruded into a 3D object, each of its subobject Splines become a solid or a void, depending on the nesting level within the shape. This powerful concept can increase your productivity in making complex 3D objects while minimizing the use of computer memory.