Focus On 3D Terrain Programming phần 5 ppt

... of terrain. The driving concept ofgeomipmapping is that you have a set patch of terrain. For this expla-nation, I’ll say it’s a patch with a size of 5 vertices (a 5 × 5 patch). That 5 × 5 patch ... imple-mentation. Check out demo5_1 (on the CD under Code\Chapter 5\ demo5_1) and look at a sample screenshot from that demo inFigure 5. 17. It shows the textured/detail-mapped image on the leftand ... Figure 5. 12):With that equation in mind, check out Figure 5. 13 to see what vari-ables we are going to plug into the equation.90 5. Geomipmapping for the CLOD ImpairedFigure 5. 12 The 3D distance...

... enter the hardcore terrain programming section, which contains all sorts of information on advanced terrain algorithms.References1 Van Noland, Charlie. “Slope Lighting Terrain. ” 2002.http://www.gamedev.net/reference/articles/article1436.asp.724. ... lightmap onto terrain, butthe more advanced lightmapping concepts concentrate on the genera-tion of a lightmap. (I’ll be showing you one such algorithm a bit later.)644. Lighting Terrain Figure ... but the implementations are simple, and you should use themonly in conjunction with the text. With that said, let’s get started.CLOD Terrain 101You’ve heard the term Continuous Level of Detail...

... terrain mesh (forexample purposes, we’ll choose a heightmap resolution of 256 × 256 ),(0,0) would have texture coordinates of (0.0f, 0.0f), and the upper-leftcorner of the terrain ( 255 , 255 ), ... Shankel, Jason. “Fractal Terrain Generation—Fault Formation.”Game Programming Gems. Rockland, Massachusetts: Charles RiverMedia, 2000. 499 50 2. 2 Shankel, Jason. “Fractal Terrain Generation—MidpointDisplacement.” ... smooth terrain. Now, let’s kick this expla-nation into the second dimension.Keep the 1D explanation in your head constantly as we talk aboutwhat to change for the 2D explanation because every concept...

... theory. Let’s move on to the next section.Propagation PropagandaThis theory section is about how to improve the tessellation of yourquadtree implementation. In the previous section, we talked aboutgeneral ... of 0– 255 . (That isthe maximum precision that an unsigned char can get. I don’t knowabout you, but I don’t feel like spending more memory on making aquadtree matrix of higher-precision values.)We ... byte-friendly range of[0, 255 ].1226. Climbing the QuadtreeFigure 6. 15 Wireframe image of the terrain from Figure 6.14.Ta b le 6.1 Controls for demo6_1Key FunctionEscape / q Quit the programUp...

... implementation, the update/shutdown functionsare going to be almost laughably small, consisting of one line each. Tostay consistent with previous chapters, let’s start with the initializationfunction ... ended upwith a fast, flexible, and good-looking terrain implementation! Wehave only one more terrain algorithm to cover, so let’s get to it!1 25 SummaryROAM 2.0Yes, that’s right: ROAM 2.0. ... our way to the shutdown function. However, unlikethe previous chapters, I’m going to mix theory with implementation.Initialization v0. 25. 0During initialization, only a few tasks need to be completed....

... allocation/freeing functions are the high-level abstractions that call on the add/remove triangle functions. Let’s focus on the low-level manipulation functions because the high-levelones are ... diamond information and use thevertices contained in the diamond (the diamond’s center vertex andthe center vertices of its previous and next diamond links). The high-level rendering function ... the ROAM 2.0 implementation is called a diamond.Each diamond in the tree consists of two right isosceles trianglesjoined on a common base edge. Each triangle also consists of fourchild triangles—but...

... texture! Check outdemo8 _5 on the CD (under Code\Chapter 8\demo8 _5) and Figure 8.19to see a screenshot from that demo.Camera -Terrain CollisionDetection and SimpleResponseDo not let the heading ... aninterpolation bias. This function is called CosineInterpolation, and we’lluse it in conjunction with the RangedSmoothRandom function to form thebasis of our noise generation.Now for the ... generation function with some sort of resolution boundary; otherwise, we’re going to have one really highly tessellated dome.1808. Wrapping It Up: Special Effects and MoreFigure 8. 15 The equation...

... mapsdefined, 52 hardware multitexturing, 54 55 ROAM algorithm, 147–148diamond pool buffer, ROAM algorithm, 153 – 154 diamondsbase unit, 149creation function, 151 – 153 Enqueue function, 158 merge function, ... functions, 160Allocation function, 160backbone data structure, 149– 156 binary triangle tree, 129–132detail mapping, 147–148diamond creation function, 151 – 153 diamond pool buffer, 153 – 154 diamonds, ... maps, 54 55 height-based lightingdefined, 58 GetTrueHeightAtPoint function, 58 59 light source coloring, 59 –62lighting value calculations, 59 shortcomings, 60–62visual explanation, 59 heightmapsbrute...

... Trong hộp thoại Render Output File vừa hiển thị, đặt tên cho cảnh phim này là animlife.avi. Nhấp Save để lưu phim vào thư mục con images. Hộp thoại Video Compression hiển thị, trong hộp ... nhỏ bằng một phần tư kích thước mặc định, điều này sẽ làm cho việc render trở nên nhanh hơn. Trong vùng Time Output của hộp thoại này, nhấp chuột bật Active Time Segment. Trong vùng Render ... my_animlife.max. Trong hộp thoại Open File, chọn tên My_animate trong danh sách. Trên thanh trình đơn, nhấn chọn Rendering > Render để hiển thị hộp thoại Render Scene. Trong hộp thoại...

... functions to do the conversions:day_of_yearconverts the month andday into the day of the year, andmonth_dayconverts the day of the year into the month andday. Since this latter function computes ... declarations for the functions mentioned in this section,plusavarietyofotherstring-handlingfunctionsfromthestandardlibrary.Exercise 5- 3. Write a pointer version of the functionstrcatthat we ... functionsforperformingthetransformationsareasfollows:staticchardaytab[2][13]={{0,31,28,31,30,31,30,31,31,30,31,30,31},{0,31,29,31,30,31,30,31,31,30,31,30,31}};/*day_of_year:setdayofyearfrommonth&day*/intday_of_year(intyear,intmonth,intday){inti,leap;leap=year%4==0&&year%100!=0||year%400==0;for(i=1;i<month;i++)day+=daytab[leap][i];returnday;}/*month_day:setmonth,dayfromdayofyear*/voidmonth_day(intyear,intyearday,int*pmonth,int*pday)94Consider the problem of writing a functionmonth_name(n), which...