- Box Modeling (How we are modeling): Using the primitaive polygons like a cube or a sphere to create. Start with a simple shape (low poly) and start adding more detail with the varies tools offered in a 3D software.
- Edge Modeling: It is built piece by piece. Extruding edges to form your polygon. This may sound needlessly complicated, but certain meshes are difficult to complete through box modeling alone, the human face being a good example.
- NURBS Modeling: a modeling technique used most heavily for automotive and industrial modeling. In contrast to polygonal geometry, a NURBS mesh has no faces, edges, or vertices. Instead, NURBS models are comprised of smoothly interpreted surfaces, created by "lofting" a mesh between two or more Bezier curves.
- Digital Sculpting: Create 3D models in a fashion very similar to sculpting digital Programs like MudBox or ZBrush.
- Procedural Modeling: The word procedural in computer graphics refers to anything generated algorithmically, rather than being created manually by the hand of an artist. Procedural modeling is often used for organic constructs like trees and foliage, where there is almost infinite variation and complexity that would be very time consuming (or impossible altogether) for an artist to capture by hand.
- Image Base Modeling: Photogarphs, at different angles, can be used to quickly and realistically model. Movies like "The Matrix" and "Transformers" use this kind of technique to move their production along
- 3D Scanner: Scanning is often used when a digital representation of a real-world actor is required, as in The Curious Case of Benjamin Button where the lead character (Brad Pitt) aged in reverse throughout the film
Go to: http://3d.about.com/od/3d-101-The-Basics/a/Introduction-To-3d-Modeling-Techniques.htm
for more information