computer graphics c version phần 8 docx

... track of which surface section is visible on each scan line. This works only if surfaces do not cut through or otherwise cyclically overlap each other (Fig. 13-11). If any kind of cyclic ... in Chapter 14. 13-1 1 CURVED SURFACES Effective methods for determining visibilit$ for objects with curved surfaces in- clude ray-casting and octree methods. With ray casting, we calculate...

Ngày tải lên: 12/08/2014, 11:20

... where text color piramcter tc specifies an allowable color code. We can adj~~st text size by scaling theoverall dimensions (height and width) of characters or by scaling only the character width. ... a curve, ci\rcles (or markers), and text. ?hftesy of Wolfmrn hrch, Inc., The Mah of Malhtica.J Additional primitives available in graphics packages include cell arrays, c...

Ngày tải lên: 12/08/2014, 11:20

... focusing, deflection of the electron beam can be controlled either with electric fields or with magnetic fields. Cathode-ray tubes are now commonl!. constructed with magnetic deflection coils ... earth's surface by Tom Palmer, Cray Research Inc./NCSC; Chris Landreth, NCSC; and Dave W, NCSC. Pollutant SO, is plotted as a blue surface, acid-rain deposition is a color pla...

Ngày tải lên: 12/08/2014, 11:20

... geometric components of pictures. Additional output primitives that can be used to construct a picture include circles and other conic sections, quadric surfaces, spline curves and surfaces, polygon ... device inter- face methods is given in the Computer Graphics Interface (CGI) system. And the Computer Graphics Metafile (CGM) system specifies standards for archiv- ing and tra...

Ngày tải lên: 12/08/2014, 11:20

... lines arc then processed through the intersection calculations, which must solve simultaneous circle-line equations Splitting Concave Polygons We can identify a concave polygon by calculating ... Area Clipping (polygons) Curve Clipping Text Clipp~ng Line and polygon clipping routines are standard components of graphics pack- ages, but many packages accommodate curved objects, pa...

Ngày tải lên: 12/08/2014, 11:20

... orthographic projection is callcd a \hri :Gi13. Engineering and architectr~ral drawings commonly employ these orthographic projritions, because lengths and angles are accurately de- yictc,d and can ... 1c. O; C& lt;4; c+ +I trnp[r] [cl = a[rl IOI'blO] [cl + alrl Ill'b !I [cl + a[r] [2Ji1[2! Ic] + alr] [3l*b[3] [cl: for (r=O; r<4: r*+l for (c= S: cc4; c*...

Ngày tải lên: 12/08/2014, 11:20

... surface. Figure 14-60 shows a ray-traced scene containing multiple objects and texture patterns. Reducing Object-Intersection Calculations Raysurface intersection calculations can account ... (Courtesy of Shmchmg Eric Chm, Sfuart I. Feldman, and Inlic Dorrty, Program of Computer Grapltics. Corndl Unimity. O 1 988 , Corndl Untmify, Program of Gmpufcr Graphid Figure 14 -89...

Ngày tải lên: 12/08/2014, 11:20

... am, 131 cell&% Cek, 588 Center d projection, 4.33 Cenlrdl structwe stom (US), 251 CGI (Compltcr Craphicr Interface), 79 CGM (Computn Graphics Meme), 79 Charadr a~tnbu@, 163-63 ... Anrmahon, 584 acrelerations. 591-94 action specficatiom, 587 applicahons, 5-7, 17- 18. 19-24 cels, 588 color-table, 586 87 dim1 mohon spec~ficdnon, 594-95 double buff&&a...

Ngày tải lên: 12/08/2014, 11:20

... and science had to rely on expensive and cumbersome equipment, advances in computer technology have made interactive computer graphics a practical tool. Today, we find computer graphics used ... focusing, deflection of the electron beam can be controlled either with electric fields or with magnetic fields. Cathode-ray tubes are now commonl!. constructed with magnetic deflecti...

Ngày tải lên: 04/06/2014, 12:01

... which merelycausedlargeintegerconstantstobelong.TheUsuffixesarenew. A.2.5.2CharacterConstants A character constant is a sequence of one or more characters enclosed in single quotes as in 'x' . The value of a character constant with only one character ... storage class. Automatic objects are local to a block (Par.9.3), and are discarded on exit from the block. Declarat...

Ngày tải lên: 06/08/2014, 09:20