Task 3 - Geometric Theory

3D modelling is where a shape placed in a 3D space by various methods and is made up of different shapes. 2 main types of 3D models are called polygonal models and NURBS surfacing which are main ways 3D modelling is achieved in films or the gaming industry.

                                                                    

This is an example of a low resolution polygonal model.                             This is an example of a NURBS model.

             


NURBS is an anagram which stands for Non-Uniform Rational B-Spline and this type of modelling is more versatility used in automotive design and engineering as they are extremely mathematically accurate which is what is needed in these means of work.
Polygonal Models are made up of Vertices's, Edges and faces which all come together to make the wire mesh of a model.

Polygonal models are more commonly used in the film industry. these are made up of vertices's which are like the corners of a shape, edges which are lines that connect the vertices's together and faces.
Vertices's are the 3D points in a XYZ space and by changing these you alter the shape of the model all together.

Edges are what connect the vertexes together and act as the wire mesh and in-between are faces and the number of these are the polygon count. These edges are the outline of the model and are naturally straight however you can use a tool which curves them.

3D coordinates space and axes, this is where the vertexes are placed to look 3D and changing the coordinates will change the shape. The Z axis is what makes the model 3D by the optical illusion of giving it depth.