ΟΡΟΛΟΓIA
Οι ορισμοί αυτοί είναι από το βιβλίο του Rory Stuart. Όσοι έχουν * είναι από το βιβλίο του Μ. Saleh Uddin. (βλ. βιβλιογραφία). Tέλος ό,τι είναι σε italics είναι δικό μου σχόλιο.
augmented reality : the integration of computer-generated synthetic stimuli with real world stimuli from the user's surroundings. Often thought of in terms of see-through HMDs (βλ. HMD) that overlay text and graphics on real world objects, augmented reality can also use other sensory modalities, such as an auditory display that combines synthetic sounds with sounds in the user's environments. (βλ. Vallino Thesis ) ,(βλ. Web Gallery )
ambient light* : a type of light that illuminates all the surfaces equally and which is always present. Its intensity and colour are user defined parameters. Ambient light does not cast shadows, but fills in the shadowed areas of a scene.
bitmap* : an image composed of pixels of specified colours. A bitmap can be any resolution with any number of colours. The most common bitmap format are PICT and TIFF.
Boolean Operation* : they are Union, Intersection, Difference and Split operations, which can be applied to solids, closed 2D modelling shapes lying on the same plane, and closed drafting elements.
CAD* : Computer - Aided - Design : the use of computers to prepare and test dimensional drawings for engineering, architecture and mechanical fields.
CAVE : an enclosure that surrounds a user with large screens that project images that are viewed through shuttered glasses to provide stereoscopy and are coupled to the users head-tracked movements. (βλ. Web Gallery )
cybersickness : simulator - like sickness : a constellation of symptoms, including nausea, oculomotor discomfort, and disorientation, that might result from the use of a virtual environment system.
flat shading *: a fast rendering algorithm that gives each facet of an object a single colour. It yields a solid representation of objects without taking a long time time to render. (βλ flat-gouraud-phong shading comparison )
gouraud shading *: a rendering algorithm that provides more detail because it averages colour information from adjacent faces to create colours. It is more realistic than flat shading but less realistic than phong shading or ray- tracing. (βλ flat-gouraud-phong shading comparison )
HCI : Human-Computer -Interaction (βλ interactivity)
HMD : Head Mounted Display : a worn helmet or glasses which allows the user to see the VE
hiden - line : a modelling plotting method by which only the visible edges of the objects are displayed. Edges of the back sides of objects or edges that are hidden by other objects are not shown.
image mapping* : a two dimensional image ((in the form of a PICT file) applied to the surface of an object. Image mapping is convenient for placing pictures or text onto objects.
immersion : the presentation of sensory cues that convey perceptually to users that they are surrounded by computer generated environment.
interactivity : encompasses both the frequency, range, and significance of user's choices in interacting with the system, as well as the tight coupling of head-tracked (and other) user input with a multisensory display.
object - oriented programming : αντικειμενοστρεφής προγραμματισμός, που θέλει κάθε οντότητα να παριστάνεται μέσω ενός συνόλου ιδιοτήτων και των αντίστοιχων τιμών που αυτές μπορεί να λάβουν και από ορισμένες άλλες δηλώσεις που καθορίζουν την "συμπεριφορά" της οντότητας. (Εφαρμ. και Επιπτ. στον Αρχ. και Αστ. Σχεδ. ,Γ.Β.)
phong shading *: a rendering algorithm that creates high quality surfaces. Phong shading calculates a colour for every pixel for an object' s surface. The path that the light follows os not calculated in Phong shading (as it is in ray tracing) so advanved lighting effects like reflection and transparency can not be represented. (βλ flat-gouraud-phong shading comparison )
ray tracing * : an intricate rendering algorithm that can create photorealistic images. Ray tracing calculates the path of imaginary "rays" of lightfrom the observer's viewpoint through each pixel on the surface of an object being viewed. The colour of each pixel is determined by how these rays would bounce off or be absorbed into an object's surface.
real time : to computer systems real time systems are systems in which not only the logical result of computations but also the time to produce results determine system performance
texture mapping *: a rendering algorithm that "maps" a texture image onto the surface of an object.
virtual reality : VR : the popular expression for what is generally referred to in the technical field as virtual environment. (βλ. Web Gallery )
virtual environment : VE : an interactive computer generated environment presented by a virtual environment system.
virtual environment system : a human-computer interface that provides interactive, immersive, multisensory, 3-D, synthetic environments to its users.