SIMPLE MODELLING TECHNIQUES FOR 3D ASSESTS
Computer vision covers the building of integrated vision systems and the application of vision to glitches of real-world importance. The process of creating 3D models is still rather problematic requiring mechanical measurement of the camera positions or manual configuration of partial 3D views of a scene. However using algorithms, it is possible to take a collection of stereo-pair images of a scene and then mechanically produce a photo-realistic, geometrically accurate digital 3D model.
Box modeling is a technique in 3D modeling where a primitive shape (such as a box, cylinder, sphere, etc.) is used to make the elementary shape of the concluding model. This elementary shape is then used to carve out the final model. The process uses a number of monotonous steps to reach the final product which can lead to a well-organized and more controlled modeling process.Box modelers often work in phases right from starting with a low-resolution mesh, refining the figure, and then sub-dividing the network to smooth out hard boundaries and add elements to it. The box modelling is probably the most common form of polygonal modeling and is often used in combination with edge modeling techniques.
NURBS is Non-Uniform Rational B-Splines. They are mathematical representations of 3‑D geometry that can precisely define any shape from a simple 2‑D line, circle, arc, or curve to the most complex 3‑D organic free-form surface or solid. Only because of their flexibility and accuracy, NURBS models can be used in any method from illustration and animation to manufacturing. NURBS curves are shaped with a tool that works very likewise to the pen tool in MS paint or Adobe Illustrator. The curve is drawn in 3D space and modified by moving a series of handles called CVs (control vertices). To model a NURBS surface, the artist places curves along projecting contours and the software automatically inserts the space between. Alternately, a NURBS surface can be created by turning a profile curve around a central axis. This is a common and very fast modeling technique for objects that are radial in nature .For e.g. in wine glass, vessels etc.
Procedural modelling is an authority term for a number of techniques in computer graphics to create 3D models and textures from sets of rules.For instance procedural modelling can be used to rapidly convert GIS data to a city scale 3D model. Procedural modelling techniques apply algorithms for producing scenes. The set of rules may either be embedded into the algorithm, configurable by parameters, or the set of rules is separate from the evaluation engine. The output is called procedural content, which can be used in urban planning, or the user may edit the content manually.