Solid model, C-rep, B-rep, and sweep-rep.

Solid Model:

Solid Model: Solid model is the clear, complete representation of object. This used to represent an object and complete details is obtained by drawing a separate solid model of the object.In creating the solid model objects, 3D modeling concepts are used.

Schemes of solid modeling:

In this modeling the 3D space is used to divided two types Exterior and Interior.

There are different schemes:

There are different types of Schemes they are as follows:

• C-rep
• B-rep
• Sweep Rep

C-representation:

• This is mostly used one and this can represent easy to understand, they can create easily and can stored. this is commonly used for representing simple objects.
• In this they use polyhedral  primitives to get high accuracy.
• To represent complex structures it is difficult to it. to generate wire-frame model C-rep should be converted in to B-rep.

B-representation:

• This type is used to make a physical object. the entities used in it are geometric and topological entities.
• In this thy are bonded to one another like physical body is bounded by a set of faces and each face is bounded by edges and each edge is bounded by vertices.
• This is used to automobile body, aircraft fuselage etc.
• space required for this is more. for designing and production by Euler operation it is not possible. this is also not useful in tool movement etc.

Sweep Representation:

• This type of representation is usedful in creating 2 1/2 D solid module objects.

These are of three types:
        Linear sweeps: Following path should be linear.
        Non-Linear Sweep: There should be a curve path.
        Hybrid Sweep: It should be linear or non-linear.

• By this sweep representation complex parts can be representate by this.
• In this there is a limited modeling domine and there should be a proper sweep direction if not the shapes obtained is irregular.

Properties of Solid Model:

• Solid model should determine the interior of solid.
• It should be Rigidity.
• In this Solid boundaries should in contact with interior.
• Finite Describability.