A surface generated by connecting corresponding curves entities utilizing a linear blend between the curves. The profile defines the shape of the surface. A surface which is created using two or more cross sections. A smooth blend is generated between the cross sections. A. Primitives are simple solid model forms.
Some common primitives are cubes, cones, cylinders, pyramids, spheres, etc.
A Solid model is a model of primitive forms of solid geometry like cubes, cones, cylinders, pyramids, spheres, etc. All volumes, surfaces and angles are well defined and known unlike surface modelers or wire frame modelers. Since all solids are represented inside the system as a combinations of primitives or parts of primitives, a task like calculating the volume of a complex space present few problems. It is just a question of taking the volumes of the constituent primitives and adding or subtracting them as appropriate. So volumes and weights are well known in the beginning of the design process and lead no room for misinterpretation.