HA4 Task 4 - Mesh Construction

Mesh Construction

Even though it is possible to construct a mesh by manual work in other words by a someone using certain software in which they could get easy and they could also make faces, it is much more common to build meshes using a variety of tools. A wide variety of 3d graphics software packages are available for use in constructing polygon meshes.

Box Modelling

One of the more well known and popular methods of constructing meshes is box modelling it is uses with two simple tools which are:

1. This is the subdivide tool splits faces and edges into smaller pieces by adding new vertices an example of this would be a square this would be subdivided by adding one vertex in the center and one on each edge, creating four smaller squares.

2. The second one is extrude tool this is applied to a face or a group of faces. It creates a new face of the same size and shape which is connected to each of the existing edges by a face. Thus, performing the extrude operation on a square face would create a cube connected to the surface at the location of the face.

http://upload.wikimedia.org/wikipedia/commons/thumb/3/39/BoxModelingIntro_Form.jpg/511px-BoxModelingIntro_Form.jpg

Extrusion Modelling

Their are many modelling methods but my second one is common modelling method this is sometimes referred to as inflation modelling or sometimes called extrusion modelling. In this particular method the user creates a 2d shape which is then traces the outline of an object from a photograph or a drawing. The user then uses a second image of the subject from a different angle and extrudes the 2d shape into 3d, again following the shape’s outline. This method is especially common for creating faces and heads. In general, the artist will model half of the head and then duplicate the vertices, invert their location relative to some plane, and connect the two pieces together. This ensures that the model will be symmetrical.

http://3.bp.blogspot.com/-G_RQxa8XBcw/UhwXdSU2QPI/AAAAAAAABh0/iXWMJm9yNB8/s640/Extrusion-Modeling1.jpg

Primitive Modelling
Another common method of modelling is creating a polygonal mesh is by connecting together various primitives these are predefined polygonal meshes created by the modelling environment. Common primitives include things like Cubes, Pyramids, Cylinders, Spheres theses are just some examples of creating mesh using these shapes. The 2D ones are primitives, such as squares, triangles, and disks these are some of the most commonly one used by people such as myself to create objects and to make them look real.

http://wiki.blender.org/uploads/thumb/f/f1/Mesh-primitives.png/610px-Mesh-primitives.png

Specialised Modelling

Finally specialised modelling you can find some specialized methods of constructing high or low detail meshes exist. Sketch based modeling is a user-friendly interface for constructing low-detail models quickly, while 3d scanners can be used to create high detail meshes based on existing real-world objects in almost automatic way. These devices are very expensive, and are generally only used by researchers and industry professionals but can generate high accuracy sub-millimetre digital representations.