Task 4 - Mesh
Construction
Polygonal Modelling
Polygonal modelling is making up the surfaces of a model using polygons. This process is used in 3D computer graphics. For real time computer graphics scanline rendering is the best method of choice. There are some other methods including sub division surfaces, NURBS surfaces and equation based methods.
Geometric primitives are used in computer graphics usually using the simplest shapes the computer can handle. Modern 2D computer graphics systems may operate with primitives which are lines, circles, curves boxes and polygons. In 3D applications basic shapes are considered primitives such as cubes, boxes, spheres, cylinders and pyramids.
Polygonal modelling is making up the surfaces of a model using polygons. This process is used in 3D computer graphics. For real time computer graphics scanline rendering is the best method of choice. There are some other methods including sub division surfaces, NURBS surfaces and equation based methods.
Primitive Modelling
Geometric primitives are used in computer graphics usually using the simplest shapes the computer can handle. Modern 2D computer graphics systems may operate with primitives which are lines, circles, curves boxes and polygons. In 3D applications basic shapes are considered primitives such as cubes, boxes, spheres, cylinders and pyramids.
Box Modelling
This is a technique in 3D modelling where a primitive shape is used to make the basic shape of the final model. The shape is then used to sculpt out the final model.
Extrusion Modelling
Extrusion Modelling is a method of adding geometry to
a polygon primitive. This is one of the first things a modeler uses to begin
shaping a mesh. Using extrusion the modeler handles the 3D mesh by either
collapsing a face in upon itself in order to create a dent or by extruding the
face outwards.
Sketch Modelling
Sketch based modelling is a way of creating 3D models for use
in 3D computer graphic applications. Sketch based modelling is different from
other types of modelling due to its interface. Instead of editing polygons in
order to make a 3D shape. A 2D shape is drawn and is then converted into a 3D
shape.
3D Scanners
A 3D scanner is a device which analyses a real life
environment or object and collects data about its shape and appearance. Using
this data the scanner can then create a 3D model.
Sources
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